700c, 27-Inch & 650c

The Zipp G40 XPLR is a wide (40mm) tire designed for control, which translates in the gravel world to higher overall speed. In developing this tire, Zipp began with a speed-carrying chevron center-tread pattern that transitions to an inverted soccer cleat design, then added XC-style knobs on the edges that offer the ability to dig in when you need it. And, amid all this, durability was crucial. The tire's casing and bead-to-bead puncture protection strip navigates the fine line between supple and stiff so that grip and performance do not suffer while making an incredibly durable gravel tire. The tire's 40mm width was carefully selected to be most effective with its tread pattern while also fulfilling riders' evolving preferences for wider tires during gravel events and off-pavement riding. It's just what you need for gnarly, all-day riding. It performs exceptionally well with Zipp's widest and most versatile 700c rim, the 303. - High-performance gravel and adventure tire - Aggressive cornering side knobs for excellent control - Fast-rolling center section - 30-65 psi - Tubeless Ready, tube compatible - Hookless compatible - ETRTO 40-622 (700x40c) - 120 TPI - Tan sidewall - Aramid bead-to-bead puncture protection that is very resistant to sidewall cuts - Hookless compatible - Weight: 480g

Every watt, every bit of energy counts whether you're racing or training; make sure you're getting the biggest aero advantage with Zipp's Tangente Course Tire. It takes advantage of Firecrest technology to reduce rolling resistance and increase airflow over the leading edge of the tire, meaning you work less to go faster. The rubber used in the Tangente tire is formulated for grip and acceleration, particularly in dry conditions, and the 120 TPI casing features a nylon puncture protection strip so you get as many miles as possible out of this rugged tire. It's light too, complementing your already feathery race day rig.

FAAAASSSTT! The Nano 40c is built for speed, and let’s just politely say it delivers. A 40mm, rounded profile and an elevated centerline provide enough volume for lower tire pressures and a smoother ride while still reducing drag and rolling resistance. This makes for an all out gravel destroyer that can still appease those clamoring for a truly big cyclocross tire. Winner? We think so. So does everybody else. Don't believe us? Just ask. Everybody's irrefutable favorite, 'nough said. Usage: Gravel / Cyclocross Conditions: Dry to Damp / Hardpack to Sand - TCS Light/Fast Rolling: 530g, Dual DNA compound - Race Tube-Type: 470g, DNA compound - Comp Tube-Type: 550g, DNA compound

It’s all in the name, ThickSlick. Made with a burly casing designed to withstand the roughest urban conditions, while the no-nonsense, slick design provides the bite you need in the concrete jungle. Need more rubber? The nearly indestructible Flat Guard level, with its Urban Armor Casing and added rubber everywhere, provides optimal protection to contend with any city streets. It's no one wonder why this tire has a cult following among couriers, those not wanting to deal with flats, and value-conscious consumers. ThickSlick Benefits: - Puncture Protection: The thicker a tire, the harder it is for glass, pins, staples, and other urban unpleasantries to worm their way in. - 2x the Rubber: Twice the rubber tread equates to twice the lifespan of a tire. This means your price is 50% off the competition. - Smoother Ride Quality: Twice the rubber makes for a smoother ride through the natural absorption qualities of rubber. - Usage: Urban, Recreation, Utility - Conditions: Road

The Corsa has been the race-day choice of pros for years and is now better than ever with 4C Graphene compound technology! The latest Corsa is an evolution of the brand and brings multiple industry-first technologies to market. Starting with our supple yet durable 320 TPI Corespun-K reinforced casing and adding a proprietary mix of 4 different Graphene compounds, the new Corsa achieves the holy grail of performance: speed, suppleness, durability, and reliability. Whether winning a Grand Tour or a local crit, the Corsa family delivers world-class performance. - 4 separate Graphene compounds deliver speed, suppleness, durability, and reliability - Reinforced Corespun-K casing for increased sidewall protection - Folding bead

The Corsa has been the race-day choice of pros for years and is now better than ever. The Corsa achieves the holy grail of performance: speed, suppleness, durability, and reliability. Whether winning a Grand Tour, or a local crit, the Corsa family delivers world-class performance. - 320 TPI Kevlar reinforced Corespun-K casing for increased sidewall protection - 4 separate Graphene rubber compounds

The Corsa Control tackles greasy cobbles and rough roads with all the confidence of the Vitttoria's classic Corsa. This chevron tread pattern adds dynamic performance to the Corsa Control tread, allowing for increased grip on slippery surfaces, as well as added durability. - 4 separate Graphene compounds deliver speed, suppleness, durability, and reliability - Corsa level confidence for rough roads - Reinforced Corespun-K casing for increased sidewall protection

The Corsa Control tackles greasy cobbles and rough roads with all the confidence of Vitttoria's classic Corsa. This chevron tread pattern adds dynamic performance to the Corsa Control tread, allowing for increased grip on slippery surfaces, as well as added durability. - 4 separate Graphene compounds deliver speed, suppleness, durability, and reliability - Corsa level confidence for rough roads - Reinforced Corespun-K casing for increased sidewall protection

This new version of the proven, fast-rolling Randonneur tire features new 1c compound construction. - Hard-working, hard-wearing tire built for racking up big mileage - The ideal tire for city riding and touring, even in semi-wet conditions - ECE-R75 (European Certification e-bikes)

Improve your ride and get great flat protection with Vittoria's Randonneur tires. They sport a grippy tread pattern reinforced with Aramid fibers for long-wearing durability. And, the 60-thread-per-inch nylon casing has double shielding for enhanced puncture protection. - 430-570g (28-37mm) - Wire bead

Designed for intensive training, the Rubino Pro is equally suitable for racing events. This tire builds on the standard Rubino platform, utilizing the same exclusive 3C Graphene compound structure, long service life, puncture protection, and sharp handling traits, but substitutes a folding bead material for reduced weight. The Rubino Pro has long been a favorite for both training and racing, and with the addition of Graphene technology compounds, is more versatile than ever. - 150 TPI Nylon casing for high mileage - 3 compounds in the tread (3C) for increased wear life and better rolling - All-rounder for any condition - Functionalized GRAPHENE 2.0 compound allows for increased wet grip

If your idea of less-than-ideal cycling weather involves widespread road closures, Vittoria’s Rubino Pro Endurance G+ may be the tire for you. Inspired by all-weather tires for the automotive industry, this tire demonstrates Vittoria’s considerable expertise with its three-compound rubber arrangement, featuring the revolutionary G+ Isotech compound. G+ is made with graphene, which allows the tire to be at its hardest when rolling straight while softening when braking or cornering, giving you excellent durability in a fast-rolling tire with exceptionally high performance characteristics. These elements are specially tuned in the Rubino Pro Endurance to perform well even at sub-freezing temperatures that leave most tires numb and slick. - Folding bead - 23mm: 440 grams - 25mm: 480 grams

You want to go fast—need to go fast. So does the Rubino Pro Speed G+ from Vittoria. Combining three rubber compounds to optimize suppleness, protection, and speed, this svelte tire delivers race-ready performance that will stand up to daily thrashing and long training sessions. Vittoria’s G+ Isotech compound blows away the old paradigm in which you traded grip for rolling resistance, and low weight for durability. Rolling straight down the road, G+ tires are at their hardest, reducing rolling resistance and increasing durability and puncture protection. When you get on the brakes or dive into a corner, the rubber actually softens, seriously increasing traction and road-sense. Go ahead and push them to your limits. Vittoria has you covered. - 23mm: 180 grams - 25mm: 190 grams

Whether in Gravel or Cyclocross, one thing is for certain-course conditions are constantly changing. When you roll up to the start line, be confident knowing that you have the performance advantage of the Terreno Mix all conditions tread, no matter the terrain. At the heart of the design is a fast rolling center ridge, which is designed to minimize rolling resistance, while still providing confident braking traction. Cornering and off camber work is confidently handled by alternating open shoulder lugs. These lugs are shaped to allow a supple feel for pavement and hardpack surfaces, while still offering a solid effective edge for grass and loam terrain. The exclusive 3C Graphene compound structure places 3 unique compounds where you need them most, adding to the performance. - Exclusive 3C compound construction featuring Graphene compound technology - Fast rolling center-ridge design - Open shoulder lugs for secure off-camber traction - Traditional tread profile, for smooth transitions, across varied terrain

The Tacx trainer tires have been developed specifically for riding indoors on bike trainers. The special rubber minimizes the risk of overheating, slipping, and wear and tear. They are also quieter than regular rear tires on both road and mountain bikes. Tacx trainer tires are not suitable for outside riding.

27 x 1-1/8-inch replacement tire from Sunlite. - Bead: Wire - TPI: 27

- Hybrid/touring tire for fast rides and commuting - Wire bead

- Recreational tire with raised center, slight lateral grooves for traction - Size: 700 x 23c

- Recreational tire with raised center for low rolling resistance - Fits older road bikes - Size: 27 x 1 1/4

- Recreational tire with raised center, slight lateral grooves for traction

- Street tire - Grooved tread with directional siping - Wire bead

- 3mm thick protective layer - The archetypal high quality touring tire - E-Bike Ready. You can choose every Marathon for your E-Bike (E-25). The main sizes are approved and tested for E-bikes up to 50 km/h (E-50).

Schwalbe's Marathon Plus is legendary for durability and protection. Their nearly impenetrable 5mm-thick SmartGuard layer almost eliminates flats over the course of the tire's excellent, long life. Whether you're setting out on a cross-country bike tour, cruising on a tandem, or just want peace of mind during your daily commute, the Marathon Supreme is in it for the long haul.

Schwalbe's Marathon is the archetypal touring tire. Their highly elastic, 3mm India rubber GreenGuard layer almost eliminates flats over the course of the tire's excellent, long life. Whether you're setting out on a cross-country bike tour, cruising on a tandem, or just want peace of mind during your daily commute, the Marathon Supreme is in it for the long haul.

Schwalbe built an entirely separate facility to churn out their top-of-the-line Schwalbe One tires. Although speed is priority number one, you also get a long-lasting, incredibly grippy tire that still offers solid puncture protection.

A great value that brings many high-end features into an all-around tire at a great price point. Light enough to race on and durable enough for daily use. Because of the puncture-resistant belt under the tread, the Closer Plus offers a high level of balance between weight and puncture protection. - Road training/racing tire with All-Contact Tread shape and puncture protection belt - Long lasting, all-conditions Zero Slip Grip natural rubber with silica - Supple 400D Lite Extra Cord casing

Pasela is Panaracer's standard all around touring or urban commuting tire. Its comprehensive size range ensures that you can find a Pasela for most any usage. Ride it and trust it. - Steel (Wire) bead

T-Serv ProTite is a great performance tire for urban city use, incorporating ZSG compound, 400D Lite Extra Cord, and ProTite puncture-resistant technologies. Hands down, T-Serv is the best urban strength-to-weight-ratio tire on the market today. Need to get through your urban jungle quickly and reliably? T-Serv is the answer. - Urban/Commuter tire - Aramid (Kevlar) folding bead - Max PSI: 90

Our most durable road offering - Diamond knurled slick design - MaxxShield for maximum puncture resistance - Training tire Our most popular training tire, providing excellent traction, durability, and plenty of road miles in any condition. Maxx Shield helps provide a tire that Re-Fuses to puncture.

MICHELIN's Dynamic Sport offers an excellent ride, high mileage and even puncture protection at a nice price. With its grippy tread, tough nylon casing and supple sidewalls, you'll enjoy all your road rides even more.

Keep the rubber side down and fully inflated when you choose MICHELIN's Protek tires. A specially-cut tread pattern reduces rolling resistance, and MICHELIN's rubber compound makes for an excellent grip. Grooves at the shoulders help increase traction on wet and greasy surfaces. A 1mm-thick anti-puncture reinforcement will help ensure nothing bursts your bubble, so you can enjoy the ride. Weights: 27 x 1.25 (650g) 700 x 28c (575g) 700 x 32c (630g) 700 x 35c (700g) 700 x 38c (760g) 700 x 40c (800g)

The Kenda Kwest Hybrid Tire is a road tire designed with a smooth rounded tread with large water dispersion grooves. - Kenda endorses the use of fluid based sealants only in specifically designated Kenda sealant compatible tire

The fastest riders in the world place their trust in these handmade German tubulars. The Competition is a world-class tire proven everywhere from the cobbles of Paris-Roubaix to the local crit. The 180-thread-per-inch 3-ply casing offers a velvety-smooth ride and the Vectran sub-tread provides exceptional puncture protection, reduced rolling resistance and a great road feel.

Many of the fastest riders in the world place their trust in these handmade German tubulars. The Competition is a world-class tire proven everywhere from the cobbles of Paris-Roubaix to your local crit series. The 180-thread-per-inch, 3-ply casing offers a velvety-smooth ride and the Vectran sub-tread provides exceptional puncture protection, reduced rolling resistance and a great road feel.

No fear of bedeviling flats! - Plus Breaker lining and a highly visible reflective side wall for increased safety - One of the most popular and frequently used bike tyres anywhere

Traffic signal sprinter! The SportContact turns any bike into a racer. The 26 version helps the bike messenger meet those deadlines while the 700C tire gets the fitness biker into a speed frenzy. All this added speed for your bike with zero detriment to puncture protection and reliability! Reflective Sidewall: REFLEX is 3M reflective is commonly known to be one of the most highly reflective material options. A thin, silver light-reflecting strip on both sidewalls that adds visibility and safety to Continental's city / commuter / urban tires.

In cyclocross, you want speed on the straights and traction in the turns. Continental gets you there with the Cyclo X-King RaceSport. Short, smartly spaced, self-cleaning center knobs roll quickly down the course. Toward the edges, taller square knobs offer predictable cornering traction in a variety of conditions. Plus, it boasts lightweight RaceSport sidewall protection and Continental's grippy Black Chili rubber compound, both of which make the X-King a great all-around tread!

Continental's ultra-tough Gator Hardshell combines 3 flat-protection technologies into the ultimate distance and training tire. It features a flat-busting, bead-to-bead layer of DuraSkin and an extra-wide Poly-X Breaker anti-puncture strip. But Conti wasn't done yet. They added material in the tread to improve mileage and lend another level of puncture resistance.

Continental's ultra-tough Gator Hardshell combines 3 flat-protection technologies into the ultimate distance and training tire. It features a flat-busting, bead-to-bead layer of DuraSkin and an extra-wide Poly-X Breaker anti-puncture strip. But Conti wasn't done yet. They added material in the tread to improve mileage and lend another level of puncture resistance. Plus, the folding bead keeps the weight low. Weight: 23c: 250 grams 25c: 270 grams 28c: 350 grams 32c: 385 grams

Continental's Gatorskin combines 3 flat-protection technologies into one fast-riding, high-mileage racing and training tire. It features a super-fine 180 thread-per-inch casing, a bead-to-bead layer of DuraSkin, and is finished with a Kevlar-reinforced top layer. The result is a light tire that rolls and corners with the best of them while providing flat protection second to none. - Weight: 290/310/360/365/390 grams (23c/25c/28c/32c/27 x 1 1/4) - PolyX puncture protection - DuraSkin sidewall protection

Continental's Gatorskin Folding combines 3 flat-protection technologies into one fast-riding, high-mileage racing and training tire. It features a super-fine 180 thread-per-inch casing, a bead-to-bead layer of DuraSkin, and is finished with a Kevlar-reinforced top layer. The result is a tire with a lightweight folding bead that rolls and corners with the best of them while providing flat protection second to none. - DuraSkin sidewall protection - PolyX puncture protection - Weight: 220/240/320/325 grams (23c/25c/28c/32c)

The Giro is an economical tubular tire constructed of natural rubber, a lightweight 2-ply cotton casing and a durable tread compound. Because it is both rugged and fast, it makes for a great training tire. The Giro handles up to 145 psi, too.

Our all-year-round tyre and a reliable companion for those high mileage road cyclists - Solid partner for training rides and in competition, come rain or shine - Outstanding puncture protection, reliable tread with good grip and the highest mileage - A tire with a superior durability ready for any season

Thanks to its DuraSkin anti-tear fabric, the Grand Prix 4-Season holds up under extreme conditions. In the Paris – Roubaix race, the “Hell of the North”, cyclists equipped with DuraSkin enhanced tires have the fewest tire-related problems during the race. Incorporating Continental's special wear resistant carbon compound, the tire is characterized by very good mileage performance as well as excellent adhesion on wet roads and at low temperatures. With the 23mm, 25mm, 28mm, and 32mm versions, the Grand Prix 4-Season makes it possible to select the right tire for various road qualities and comfort requirements. A double Vectran Breaker belt under the tread raises the puncture and cut protection to the highest level available on the market.

The Grand Prix 5000 is the best all-rounder in the field, brought to a whole new performance level. Ride faster, more comfortably, and with increased puncture protection. Its Active Comfort Technology absorbs vibrations and smooths your ride. Lazer Grip technology, designed to make you one with the road, features a lasered micro profile structure that expands over the tire’s shoulder and provides outstanding cornering. The Vectran Breaker is lighter, more flexible and protects more effectively against cuts than comparable nylon. With incredible tear resistance at a very low weight, it possesses exactly the right properties to be a premium puncture protection insert, while not adversely affecting rolling resistance. The Grand Prix 5000—made to make you better. With Continental's unique and legendary BlackChili tread compound, produced only in Germany, they have revolutionized the sport of cycling. This compound answers the eternal question of the best balance of grip and rolling resistance for cycling. Regular test wins confirm the measurable and noticeable advantages for cyclists, established in both the lab and on the road. The latest polymers, as well as specially developed carbon black particles and filler materials, guarantee ultimate performance.

The Grand Prix 5000 is the best all-rounder in the field, brought to a whole new performance level. Ride faster, more comfortably, and with increased puncture protection. Its Active Comfort Technology absorbs vibrations and smooths your ride. Lazer Grip technology, designed to make you one with the road, features a lasered micro profile structure that expands over the tire’s shoulder and provides outstanding cornering. The Vectran Breaker is lighter, more flexible and protects more effectively against cuts than comparable nylon. With incredible tear resistance at a very low weight, it possesses exactly the right properties to be a premium puncture protection insert, while not adversely affecting rolling resistance. The Grand Prix 5000 Tubeless—made to make you better. With Continental's unique and legendary BlackChili tread compound, produced only in Germany, they have revolutionized the sport of cycling. This compound answers the eternal question of the best balance of grip and rolling resistance for cycling. Regular test wins confirm the measurable and noticeable advantages for cyclists, established in both the lab and on the road. The latest polymers, as well as specially developed carbon black particles and filler materials, guarantee ultimate performance.

The Grand Prix 5000 S Tubeless Ready allrounder tires are lighter, faster and supported with stronger sidewalls, compared to previous GP5000 versions. Designed to be compatible with hooked and hookless rims, this new standard in road tubeless ready technology will allow you to ride faster, more comfortable and with increased puncture protection. - Hookless rim compatible up to 73 PSI / 5 bars - The tubeless ready (TR) carcass construction is robust and impervious against damage and penetration from foreign objects. The result: versatile, low weight and an attractive design. In addition, tires made using this technology can also be used as Tubeless or with an inner tube - Vectran Breaker is a synthetically manufactured high-tech fiber with an enormous tear resistance at a very low weight: Exactly the right properties to process into a premium Continental bicycle tire as a puncture protection insert - Active Comfort Technology absorbs vibrations and smoothens your ride - Lazer Grip, to make you one with the road. The lazered micro profile structure expands over the tire’s shoulder and provides outstanding cornering - BlackChili Compound provides the best balance of grip and rolling resistance for cycling

The Ride Tour is at home on any surface: a real all-rounder Continuous center tread provides good rolling characteristics and ample traction when cornering. Reliable puncture protection thanks to Extra Puncture Belt Durable casing and long-lasting tread impress on all rides.

The Ride Tour is at home on any surface: a real all-rounder. Continuous center tread provides good rolling characteristics and ample traction when cornering. Reliable puncture protection thanks to Extra Puncture Belt Durable casing and long-lasting tread impress on all rides.

The Sprinter is characterized by excellent rolling characteristics due to the supple carcass. It demonstrates its strength especially in use with criteria. When maximum acceleration is needed, this tyre is the one to rely on. The competitor convinces with low weight and a balanced ride.

Whether on the road, on gravel or on forest paths – this all-rounder is a perfectly equipped touring tyre. Due to the pronounced centre tread, the tyre has excellent rolling characteristics and brings frequent riders quickly from A to B. The bionically designed and laminated shoulder provides good support and guarantees a safe cornering. Best Continental Racing Bike technology for touring bikers. Whether on the road, on gravel or on forest paths, this all-rounder provides maximum protection against punctures, thanks to Vectran Breaker.

Handmade in Germany, the Top Contact II Reflex is perfect for touring bikes and commuting steeds. Its smooth center rolls fast and the tread pattern on the shoulders maximizes cornering traction. The Top Contact II also utilizes Continental's Vectran technology, a polymer membrane that offers excellent puncture protection and reduces rolling resistance. This tire also sports Continental's Reflex sidewall striping for safety.

The Ultra Sport II is a road tire built to Continental's exacting standards, providing you with the optimal blend of low weight, puncture resistance, and long life. It sports a strong, supple 180 thread-per-inch, 3-ply casing and is at home in all situations, from miles of training to amateur racing to all-day centuries.

The Ultra Sport II is a folding road tire built to Continental's exacting standards to give you excellent longevity, low weight, and impressive puncture resistance. It sports a strong, supple 180 thread-per-inch, 3-ply casing for robust protection and a silica-based tread compound for ample grip and mileage, so this tire shines whether you're training or racing.

The Chicane is a super fast rolling tire providing maximum control on dry hardpack, wet grass, and icy conditions. This clincher with 120TPI nylon casing provides both performance and durability. - This tires is designed to be used with an innertube

Before the Pika, gaining traction on gravel roads was a true feat. Now, it’s child’s play. Ramped center knobs roll fast on loose gravel, and U-shaped shoulder knobs dig in on the turns. The Pika is equipped with dual compound tread, EPS protection, and wire bead.

The All Terrain is always up for adventure. From long-distance touring to light-duty offroading, this tire offers impeccable handling that won't let you down. Usage: Trekking / Comfort Conditions: Dry to Damp / Pavement to Hardpack Compound: DNS Casing: Durable Bead: Wire 26" Comp - Tube Type: 635g 32c Comp - Tube Type: 455g 37c Comp - Tube Type: 540g

Byway is for days of endless hardpack exploration and gravel grinding while also providing noticeable efficiency on any pavement linking it all together. A swiftly smooth centerline is paired to a textured intermediate section that provides a seamless transition onto small outer knobs for unwavering traction in loose dirt and gravel. Prominent outer knobs also extend down the sidewall to provide an additional level of defense from roadside unpleasantries of all shapes and sizes. Byway 34 is an identical replacement to the previously named Exposure 34 tire. We renamed the tire to create a uniform naming structure where all tires are named according to the tread pattern. SG2 PUNCTURE PROTECTION: Most sizes of this tire are available with our all-new SG2 Puncture Protection, which is a lightweight nylon insert that provides bead-to-bead coverage and ensures every area of the tire is defended against slashes and punctures. As events become progressively rougher and cyclists pedal farther, gravel gets tougher. It only makes sense for gravel tires to become tougher as well. Please refer to the charts below to determine which versions are available with SG2. - Nylon fibers have a flat profile, which reduces the amount of rubber needed to fill the gaps between fibers and minimizes weight. - Protected SG2 gravel tires feature a 120tpi casing, which improves suppleness compared to a traditional 60tpi tire. - SG2 was specifically designed to be a puncture protection layer, but it also improves air retention and eliminates seeping at the sidewall. FEATURES: - Smooth centerline for efficiency with diamond-shaped outer knobs for grip in the dirt. - High volume tire enables a comfortable ride. - Dual Compound rubber means a fast-rolling tire with great corning traction.

Our most dirt-focused Road Plus tire yet, the Byway Road Plus TCS tire delivers supple plus-size traction and smooth riding characteristics farther into the dirt. The Byway Road Plus tire allows riders to find comfort on remote gravel roads without feeling slow on the pavement required to reach them. - Smooth centerline for efficiency with diamond-shaped outer knobs for grip in the dirt - High volume tire enables comfortable ride - Dual Compound rubber means a fast-rolling tire with great corning traction - Designed to meet ETRTO standards, TCS (Tubeless Compatible System) tires feature the best of both worlds: they boast the ride benefits & reliability of a tubeless tire with the minimal weight of a tube-type tire

Volume, speed, and consistency. The Cross Boss’ even center tread shelf provides smooth and fast acceleration while more open side knobs help clear muck. A rounded, high-volume profile designed ground-up for tubeless usage provides plenty of room to modulate tire pressure while dual compound, Dual DNA rubber and defined cornering channels keep riders grinning for more turns. From singletrack to the circuit, the Cross Boss is here to bring it. Usage: Cyclocross Conditions: Dry to Damp / Hardpack to Loam - Weight: 400g - Compound: Dual DNA