700c, 27-Inch & 650c

BOS is the airport code for Boston, Massachusetts, the original hotbed of North American ‘cross and home to some of the harshest weather and the toughest courses. If you’re pinning on a number in New England you better be ready for rain, roots, ruts and mud. And, you better have a set of Donnelly BOS tubulars in your quiver. This tire is even more aggressive than our mud-proven PDX. It features buttressed side-knobs for outstanding traction in super muddy corners and off-cambers, and a center tread pattern that is all bite when it comes down to a tractor pull. Size: - 700 x 33mm Weight: - 386 grams Type: - Tubular Part #: - D50030 Product Features: - Buttressed side-knobs for superior cornering traction. - Unique center knob pattern designed for maximum traction when you need it most. - Soft rubber compound provides extra grip and shock absorption. - Tubeless design means an airtight casing with no inner tube to puncture. - Rubber-coated sidewalls are extremely durable and prevent deterioration from water, mud and dirt. - No additional sidewall coating necessary. - All in one construction means tread will not peel away from the tubular casing. - Precision design creates a straight tire with no variances in size or alignment. - The tire and base tape are consistently straight making it easy to glue and install to your wheel. - A removable valve core allows for valve extenders installation as well as insertion of tire sealant. - Liquid sealant can be used with all Donnelly tubulars to prevent or repair typical punctures.

- P Zero Velo TUB brings the handling and cornering behavior Pirelli is famous for to the finest handmade tubular construction. - It was developed on the fields of World Tour racing and in its debut year it already is a winner of a grand tour. Now available for your own. - Corespun 320tpi w/aramid reinforced casing. - Anti-puncture belt under the tread. - Latex inner tube for better weight, rolling and anti-puncture. - Soft yellow compund for racing usage. - Designed for modern wide tubular rims. - 48 mm RVC valve.

- RR-S AR Compound offers outstanding grip on both rough roads as well as pavement in all weather without compromising on speed - Single-layer SRC casing delivers an incredibly supple ride with superior rolling efficiency at a super low weight - Race Shield puncture protection provides superior puncture protection without compromising speed or road feel - Carbon/Kevlar Composite bead keeps the tire secured to the rim and provides greater strength to withstand the higher pressures needed for road tires

Race it hard or just head off the beaten path. The Strada Bianca takes the proven construction of the Paris-Roubaix and adds volume to take you comfortably over less-than-perfect surfaces. Challenge introduces STRADA BIANCA H-TLR 45. The staple herringbone-design tire proves its handmade performances on rougher terrain with a new gravel-specific construction and an added beefier new 45mm size. The STRADA BIANCA 45 is the tire designed to take you comfortably rolling over rough pavement, cobbles, sandy or hardpack fields, to literally floating over the more enduring dry, rocky terrains. It is the first 45mm tire in the Challenge range.

The Corsa Pro tire is the choice of the pro peloton, now even faster and with increased wet weather grip and puncture resistance. - Graphene + Silica compound ensures speed and confidence through a range of surface conditions, for the ultimate control - Proven cotton casing material, wrapped in a revolutionary new construction process provides the foundation for the new standard in race-day performance road tires - High-density layer below tread surface for improved puncture resistance - Zylon bead for easy fitting and air retention - Bead Shield reinforcing guard for extra bead protection - Tubeless Ready Construction

The Corsa Pro Control Tire is the choice of the pro peloton, aiming for top rough-road racing performance. - Graphene + Silica compound ensures speed and confidence on cobblestones and hardpack for grip, ultimate suppleness and comfort - Proven cotton casing material, wrapped in a revolutionary new construction process provides the foundation for the new standard in race-day performance road tires - New tread design with fishbone lateral texture for better handling feeling when cornering - High-density layer below tread surface for improved puncture resistance - Zylon bead for easy fitting and air retention - Bead Shield reinforcing guard for extra bead protection - Tubeless Ready Construction

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.

- RR-S compound provides ultimate low rolling resistance and excellent all-around grip - Optimized compound profile provides better tire shoulder grip for outstanding cornering capability - Fast all-around tread pattern for maximum speed on the road - Race Shield Puncture Protection features exclusive ultra-lightweight and cut-resistance - Kevlar material ensures maximum puncture protection - Carbon/Kevlar Composite Bead keeps the tire secured to the rim and provides greater strength to withstand the higher pressures needed for road tires

- New RR-E compound features efficient rolling and durability in the center of the tire with a tackier shoulder, offering increased grip and stability when cornering - Low rolling resistance combines with high mileage through the use of a fast, efficient, and durable compound in the center of the tire with a tackier compound on the shoulder - Optimized compound profile provides better tire shoulder grip resulting in outstanding cornering capability - Endurance-Specific Tread Pattern Design for better wet/mix-terrain grip - Race Shield Puncture Protection features exclusive, ultra-lightweight, and cut-resistant Kevlar material, ensuring maximum puncture protection - Carbon/Kevlar Composite Bead keeps the tire secured to the rim and provides greater strength to withstand the higher pressures needed in road tires

High-volume Tubeless Ready adventure tire - Diamond-knurled slick design - Dual-compound rubber - MaxxShield bead-to-bead protection - Tubeless Ready (TR) Our most popular training tire, modernized with tubeless technology and higher volumes for even more reliability and comfort. The familiar diamond tread pattern keeps things rolling smoothly, even as the pavement crumbles into gravel and hardpack dirt.

- Tire Diameter/ISO: 700C/622 - Tire Width: 28C - TPI: 60TPI - Bead: Folding - Tire Compound: Smartnet Silica - Tire Technology: ArmourTech - Tire Type: Tubeless Ready - Tire Width Range: 18 - 29 - Labeled Size: 700x28C - Tubeless Technology: Tubeless Ready

The PZERO Race 4S TLR is a year-long racing tire featuring tubeless technology that’s able to provide high grip in all kinds of weather and an increased puncture protection, while still maintaining the racing feeling characteristic of the PZERO Race range. This result was achieved thanks to the Speedcore tubeless technology with the latest evolution of casing construction, and the SmartNet Silica which holds the best formulation for wet and chemical grip among Pirelli compounds. - The wide surface of the silica rod molecules enhances its natural water affinity, delivering confident handling and grip on wet surfaces - SmartNET Silica technology delivers high rolling efficiency, thanks to its natural anisotropic orientation, which reduces heating while increasing elasticity to help minimize energy dissipation - Speedcore design adds an aramid band within the tire’s rubber layer, adding strength and support to the tire casing but retains a supple feel for minimal rolling resistance and maximum grip - 120tpi nylon casing for added puncture protection and maximum security

The P ZERO Race TLR RS was developed specifically for racing purposes, making it one of Pirelli’s fastest and most high performing cycling tires to date. Maximizing the balance between speed, handling and grip, the P ZERO Race TLR RS features SpeedCore technology and Pirelli’s SmartEvo compound, along with a newer TLR bead design for even better compatibility and air retention. SmartEvo Compound features a blend of smart polymers inherited from the Motorsport expertise, blending grip and speed, together SpeedCore brings a thinner rubber layer that allows for better handling, while the aramid fibers dispersed in the blend provide the necessary mechanical strength Not compatible with hookless rims

- This lightweight and fast tire is crafted to pack the key benefits of tubeless technology into a race-day product, emphasizing speed and handling and exceeding the performance of any other Pirelli bicycle tire in this class, TT and lightweight tubulars included, without compromising on puncture protection thanks to the TechWALL casing technology. - After three years of development working with the fastest racers at the World Tour level, Pirelli designed this new tubeless-ready tire with the new SmartEVO compound to provide our Professional riders as well as all cycling enthusiasts, with our best bicycle racing tire to date! - Techwall Road: New TLR casing technology with an added layer of reinforcement to provide superior puncture protection in a lighter structure - 28c width is compatible with hookless rims according to ETRTO 5bar/73psi max pressure limitations. 24c and 26c width are NOT compatible with hookless rims.

- Maxxis' fastest and lightest road racing tire - Light and supple 170 TPI casing, K2 puncture protection, and HYPR-S combound - This new compound retains the grip found on the original High Road, but reduces rolling resistance by 12%.

The Grand Prix 5000 All Season TR tires are ready to go the extra mile, providing confidence in all weather conditions and boosts your protection for a trusted ride. - Tubeless ready (TR) carcass construction is robust and impervious against damage and penetration from foreign objects - Vectran Breaker is spun from liquid crystal-polymer to create a multiple-thread thermoplastic yarn. This partially crystalline fabric is more cut-resistant than aramid and its tensile strength is five times higher than that of steel. A Vectran Breaker is lighter, more flexible and effective against cuts than a comparable nylon breaker, without affecting rolling resistance - Lazer Grip, to make you one with the road. The lazered micro profile structure expands over the tire’s shoulder and provides outstanding cornering - Black Chili Compound features special synthetic rubbers combined with proven natural rubber to high-performance tread mixtures, to optimize rolling properties and grip

The Schwalbe One family provides the right tire for the latest gravel bike trend. The smooth rolling G-One profile and Tubeless Easy technology make it a pleasure to ride over forest paths and rolling fields. - MicroSkin Casing

The G-One RS is a high-performance gravel tire tailored for racing and fast-paced rides on mixed terrain. It features a refined tread pattern designed to optimize speed and control, with tightly spaced central knobs for low rolling resistance on hard surfaces. The G-One RS features the lowest rolling resistance in the G-One range. - Maximum efficiency on light terrain, hard surfaces, and asphalt - Braking and traction edges for front wheel and rear wheel thanks to scale-like tread pattern - Souplesse construction for smooth ride + high puncture protection under tough racing conditions

The P Zero Race TLR is the most performing tire in Pirelli’s portfolio, as well as being the first tire with a tubeless technology entirely made in Italy. The design features SpeedCore technology in a 120tpi casing, utilizing a layer of compound mixed with aramid that covers the inner layer of the tire, improving the smoothness and the resistance of the rubber. The result is a less stiff, but faster tire. The compound on the other hand, maintains the same advanced SmartEVO technology, commonly found in other high-performance tires throughout the P Zero range. - SpeedCore is an innovative tubeless-ready construction that consists of a thin air-tight layer of rubber compound infused of aramid particles. This layer covers the internal part of the tire and thanks to the presence of the aramid into the rubber blend, it allows for better mechanical resistance, improved air retention and overall greater flexibility - SmartEVO compound uses a blend of polymers to provide maximum grip with a low rolling resistance, allowing for maximum speed and control - 700 x 28 and larger sizes are compatible with hookless rims, 700 x 26 size tires are not hookless compatible - Hookless rims subject to ETRTO 5bar/73psi max pressure limitation

Schwalbe Pro One Road Tire is a fast, reliable, and light tire. the Pro One remains controllable at all times - on the fastest descents, in extreme cornering, in all conditions. - Minimal rolling resistance - All-around cut resistance and puncture protection - ISO Diameter: 622 / road / 29" - Tire Intended Use: Road - Tire Type: Clincher Tire - Type: Folding - Tire Diameter: 700c - Weight: 215g - Pressure: 6.0-10.0 Bar (85-145 psi) - Maximum load: 70 kg ADDIX Race Compound Offers tenacious grip at high cornering speeds and extensive durability in E-operation. Evolution Line The very best possible. Highest grade materials. Latest technology. V-Guard Extremely lightweight and cut-resistant high-tech fabric. Soupless Carcass Souplesse Carcass Construction Special turn-up construction for an exceptional riding experience in race tires.

An all-conditions cyclocross tire that can handle most terrain due to its balanced tread pattern.

Gravel and dirt road racing tire - Dual-Compound for longevity - Gravel-specific tread pattern - Tubeless Ready (TR) Maxxis' first gravel-specific tire, the Rambler, is designed with the volume you need for comfort and the tread you need for speed and control. Tightly packed center knobs are ramped for rolling efficiency on hardpack roads, and spaced-out side knobs provide predictable cornering in varied terrain.

The Cinturato Gravel H (Hard Terrain) is a gravel-specific tire designed for compact terrain and the hardest surfaces. The tread features low, tightly packed knobs and elevated ability to adapt to the terrain, offering a large contact area and therefore excellent feel while riding. - SpeedGRIP Compound adds features of mechanical resistance and chemical grip without compromising the rolling efficiency - High-performance tire with unique characteristics of grip in all weather conditions, be they dry or wet, plus a high level of puncture protection - TechWALL high-strength woven nylon fabric from bead to bead for added cut and puncture protection - TLR tubeless-ready aramid folding bead optimized for wide rims and lower pressure riding

- Medium profile and tread spacing for riding quickly and confidently over a mixed variety of terrains, from hard to soft, whether for dry or wet - SpeedGRIP Compound formulation for on and off-road rolling efficiency coupled with high tear resistance and high wet grip - High-strength woven Nylon fabric from bead to bead for added cut and puncture protection - Multi-ply 127tpi Nylon casing construction - Tubeless-ready aramid folding bead optimized for wide rims and lower pressure riding

- Gravel-racing specific tire, derived from our experience in the biggest competitions around the world and feedback from Pro athletes. - Tread design inspired by the Scorpion XC RC. - Key features: Higher average speed on straight and fast lines, improved lateral grip when off-road cornering.

Cinturato Gravel S is the gravel tire for soft and muddy terrain, its a versatile model that delivers a safe cycling experience in adverse weather conditions and on technical tracks, at the very limit with mountain biking. Cinturato Gravel S in the suggested model for those looking for a reliable tire which is easy to control and safe in every condition. Grip and safety are prioritized rather than the pure speed of racing-specific models.

- The Cinturato Velo is designed around reliability in bad road conditions and heavy usage as priority and it still keeps Pirelli DNA thanks to its SmartNET Silica compound and confidence-inspiring handling. - Its patent pending Armour Tech construction combines a bead-to-bead high density layer to an aramid breaker and aramid fibers dispersed into the tread. - The SmartNET Silica compound coupled with Pirelli long experience in tread design, adds the safety and handling in any condition, whether it is wet or dry, Pirelli is already famous for.

- Unleashing profile and breathtakingly fast – especially when large volume counts. - As a 30-35mm wide road race version with V-Guard protection, G-One Speed is a tire for the real tough jobs. - It is also a guarantee for maximum speed in the extra-wide 50mm execution – of course not only at the fascinating beach races on Holland's coasts. - The new G-One Speed is an evolution of the former S-One and Big One.

Speed and reliability for riders pursuing a new performance level Corsa N.EXT is the exciting new addition to the Corsa family. Designed to satisfy the requirements of enthusiast cyclists who clock up the miles on long and demanding weekly rides, Corsa N.EXT combines Vittoria's peerless knowledge of racing performance with the durability of a long-lasting nylon casing that uses a unique Silica and Graphene compound for improved rolling efficiency, grip and longer wear-life. To increase puncture protection, the central section of the casing features 3 layers of nylon as well as an additional puncture protection belt. Corsa N.EXT is the first road racing tire to feature a QR Code—printed on the tire hot patch—for easy access to useful technical information about the tire. Racing inspired speed and feel, with the everyday durability of nylon construction - New combination of Silica and Graphene compound for improved rolling efficiency, grip and longer wear-life - Nylon casing provides durability, for daily racers who want to raise the bar of their performance relying on a long-lasting tyre - Proven tread design used by Vittoria teams in the World Tour

Using the same tread design from the Cinturato Gravel RC, the Cinturato Gravel RC X is the answer to all gravel racing requirements on rougher terrains: fast on the straights, thanks to minimal central line knobs, and aggressive on the corners, with higher and more substantial knobs to support handling when cornering. The TechWALL X tubeless casing construction features a reinforced and cut-resistant 60tpi fabric made longer to extend past the tread line, o?ering even more sidewall protection on top of the already present bead-to-bead protection layer. - Designed for the most demanding gravel courses for riders seeking the best performances in all racing conditions - SpeedGRIP Compound formulation for on and o?-road rolling efficiency coupled with high tear resistance and high wet grip - TechWALL X High-strength woven Nylon fabric from bead to bead for added cut and puncture protection - Multi-ply 60tpi Nylon casing construction, with longer overlap on the sidewall - TLR tubeless-ready aramid folding bead optimized for wide rims and lower pressure riding