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.

- Urban tire with road tread pattern - 5mm thick anti-puncture protection layer

The Dynamic Sport is a strong tire with good grip and durability. It will be your everyday companion thanks to its strength and endurance.

Indoor-training has never been so technical! Featuring our special compound and tread pattern and our strongest casing, this tire is designed expressly to disperse heat and reduce noise generated by home trainers. Keep your race tires clean and safe for race day, and spend your indoor-training miles on the Zaffiro Pro Home Trainer.

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 Terreno Dry bridges the gap between file treads, and traditional all-conditions treads. The key to this is the unique angled "fish scale" design, that allows the center tread to roll extremely fast, yet offer traction when loaded in cornering and braking. Add the transitional height mid and side tread, and the Terreno Dry transitions as smoothly as it rolls. The exclusive 3C Graphene compound structure places 3 unique compounds where you need them most, adding to the performance. From gravel grinding to medium conditions cross racing, the Terreno Dry offers consistent performance. - Center scales are ramped, providing a fast rolling leading edge, yet sharp effective braking and cornering edges - Exclusive 3C compound construction featuring Graphene compound technology - File-tread Gravel and Cyclocross race tire, designed for a range of conditions

The Sawtooth is THE adventure tire of choice, developed to handle any road surface and to be tough enough to withstand the rigors of exploration. The tread offers sharp angles and edges to hook onto any surface and uses our Blackbelt puncture protection. This model features a reflective strip on the sidewall for increased visibility in low-light conditions. - Casing: 60 TPI - Bead: Wire Bead - Flat Protection: BlackBelt - 700 x 38mm, psi 50-80 - 700 x 42mm, psi 50-80

Serfas' Seca-RS Road Folding is a superb tire combining a fast-rolling, long-wearing 60-durometer rubber center tread with 56-durometer sides for excellent cornering. This fine tire also boasts a compliant 120 thread-per-inch casing and Serfas' excellent Flat-Protection System.

Corsa inspired tread design, for paved surfaces and hard-packed gravel. The smooth Corsa inspired center rolls fast, while the side tread "scales" provide durable bite when cornering and braking. - Three compounds in the tread (3C) for increased wear life and grip - Functionalized GRAPHENE 2.0 compound delivers ultimate performance - Corsa-inspired smooth center tread minimizes rolling resistance - Gravel tire designed for paved surfaces and hard-pack terrains - Side tread “scales” provide dependable bite through corners, and when braking

Modern-looking performance tire The industry standard in performance training tires is back with a refreshed design, and increased performance! The subtle center grooves and shoulder texture retain the secure feel of the Zaffiros of the past, while streamlining the look and feel for the future. The alternating slick profile and Graphene compound mimic the feel of the Zaffiro’s higher-end siblings, while adding durability, and a more approachable price point.

The industry standard in performance training tires is back with a refreshed design and increased performance! The subtle center grooves and shoulder texture retain the secure feel of the Zaffiros of the past while streamlining the look and feel for the future. The alternating slick profile and Graphene compound mimic the feel of the Zaffiro's higher-end siblings while adding durability and a more approachable price point. - Extremely durable tires for performance training - Graphene 2.0 compound and folding bead increase performance - Modern tread design for long-lasting durability

The cool design makes the RetroRIDE an eyecatcher. In a stylish brown or cream with completely curcumferential original profiles of the legendary Conti KKS 10. Beneath the stylish outer shell it has all qualities that make a great touring tire. Finished off with a rubber breaker belt, a tread profile that even looks grippy, and a compound that provides a long service life.

Smart Sam goes well on any terrain and even on the road it rolls effortlessly. It will roll over just about anything in the Double Defense version.

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 Hemisphere is a modern, versatile, and durable trekking tire with tough Flak Jacket puncture protection and a bold tread that delivers control on loose surfaces. This tire's serial center blocks roll easily on paved surfaces, while also providing off-road traction through wide-spaced shoulder blocks that bite into soft ground. Altogether, the Hemisphere will excel on streets and bike paths alike. - Casing: 30 TPI - Bead: Wire - Compound: 70a - Flat Protection: Flak Jacket - 700 x 38mm, PSI 75-100, approximate weight 820g - 700 x 42c, psi 50-100

The Rubino Control is a folding tire with a very robust construction capable of handling the worst of road conditions without sacrificing the performance the Rubino range is known for. With full bead-to-bead tread wrap, cuts and punctures are dramatically reduced, and the tire is reinforced with the PRB anti-puncture layer inside the casing. The Rubino Control also shares the exclusive 3C Graphene compound structure, long service life, puncture protection, sharp handling traits, and lightweight folding bead material of the Rubino Pro. - Exclusive Graphene 3C compound technology - Full bead-to-bead tread wrap - Supple yet durable casing for extended use - Folding bead

Specialized's Infinity Armadillo Reflect tire is a long wearing, incredibly durable tire that's ideally suited for commuting, trekking, and street use. The deep recessed tread provides excellent traction through water and debris, while the rounded profile ensures stable, predictable handling in corners. It also features Armadillo technology for the highest level of flat protection, plus reflective accents that will increase your visibility to motorists in low-light conditions. - Casing: 60 TPI - Bead: Wire - Compound: 70a - Flat Protection: Armadillo - 700 x 32mm, PSI 75-100, approximate weight 645g - 700 x 35mm, PSI 75-100, approximate weight 665g - 700 x 38mm, PSI 75-100, approximate weight 685g - 700 x 42mm, PSI 50-100, approximate weight 715g - 700 x 47mm, PSI 50-100, approximate weight 745g

Modern-looking performance tire The industry standard in performance training tires is back with a refreshed design, and increased performance! The subtle center grooves and shoulder texture retain the secure feel of the Zaffiros of the past, while streamlining the look and feel for the future. The alternating slick profile and Graphene compound mimic the feel of the Zaffiro’s higher-end siblings, while adding durability, and a more approachable price point.

Keep your race tires clean and safe for race day, and spend your training miles on the Rally instead. The Rally provides Vittoria quality, feel, and performance, at an entry-level price point. - Durable cotton casing for extended training life - Strong compound for great performance and longevity

The Nimbus 2 Sport Reflect tire features an updated tread and compound that rolls even faster and has more grip than ever before. It comes in many widths to accommodate different bikes, riding styles, and comfort levels, so it's the perfect choice for riding on any road or bike path. And with BlackBelt flat protection and reflective accents that increase your visibility to motorists in low-light conditions, you get an added dose of that good ol' peace of mind. - Casing: 60 TPI - Bead: Wire - Compound: 60a - Flat Protection: BlackBelt - 700 x 32mm, psi 75-100 - 700 x 35mm, psi 50-80 - 700 x 38mm, psi 50-80 - 700 x 45mm, psi 35-65

The Hemisphere Armadillo Reflect tire is a modern, versatile, and durable trekking tire with tough puncture protection and a bold tread that delivers control on loose surfaces. This tire's serial center blocks roll easily on paved surfaces, while providing off-road traction by featuring wide-spaced shoulder blocks that bite into soft ground. And with maximum flat protection from our Armadillo technology, plus reflective accents that increase your visibility to motorists in low-light conditions, the Hemisphere excels on streets and bike pathways. - Casing: 60 TPI - Bead: Wire - Compound: 70a - Flat Protection: Armadillo - 700 x 38mm, PSI 75-100, approximate weight 795g - 700 x 42c, psi 50~100 - 700 x 50c, psi 35~65

- Smart DualGuard Protection - Addix-E Compound - ECE-R75 certification makes the tires ready for E-Bikes of all classes

With their front/rear-specific compounds, grippy tread pattern and high-volume casings, Giant's P-R3 AC Tires offer superior handling for any on-road conditions. Giant's Deflect 3 nylon breaker keeps pinch flats at bay and the handy built-in wear indicator lets you know when it's time for new rubber.

Don't let terrain tell you what to do. Fit your rims with MICHELIN's Protek Cross tires and you'll be equipped for any terrain and any weather condition. 3D cutting of the tread pattern creates excellent grip in all circumstances. If you're into the idea of maximum control, easy rolling, and superb handling no matter what the weather, the Protek Cross will be right up your alley, street, dirt path, and more. Weights: 26 x 1.60 (765g) 26 x 1.85 (920g) 700 x 35c (740g) 700 x 40c (840g)

The Tracer Pro 2Bliss Ready features an all around cyclocross tread for mostly hard-packed courses. The tread remains stable at low tire pressures, while the Tracer rolls smooth on tarmac and finds grip when taking tricky turns onto gravel or grass. The GRIPTON compound, meanwhile, stays supple in freezing temperatures and even delivers surprising grip over wet roots. All this makes the Tracer a tremendous gravel and adventure tire, as it rolls well on asphalt and hooks up on earth and gravel. And with this 2Bliss Ready version, you'll also benefit from its versatility, ability to run lower tire pressures, and added puncture protection. - Casing: 60 TPI - Bead: Foldable - Butyl wrapped bead = 2Bliss Ready - Compound: GRIPTON - Flat Protection 700x33mm: BlackBelt; 700x38mm: Endurant Casing and BlackBelt

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

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

Make your mark on the gravel scene with the Gravel Grinder. This tire combines a fast-rolling diamond center with aggressive shoulder knobs that only hook-up when the terrain gets soft, muddy, or a bit sketchy. This TLR clincher with 120TPI nylon casing provides both performance, durability, and puncture protection when combined with the appropriate tubeless sealant.. TLR - TLR tires versions can be ridden tubeless with the addition of sealant but can also be run with an inner tube. - A bead-to-bead inner coating gives added puncture protection to these tubeless ready tires and greatly reduces gradual loss of air pressure. An aramid bead protection strip increases tire longevity and reduces rim chafing.

- A classic road tire featuring the traditional chevron tread pattern - The LGG provides a supple ride, durable yet lightweight construction, and puncture-protection belt under the tread - 120 TPI version is dual compound tread: 70a in center, softer 60a on sides. 60 TPI is single compound tread 70a

- An adventure tire designed for mixed conditions - Smooth-rolling center knobs and aggressive shoulder lugs - The combination of smooth-rolling center knobs and aggressive shoulder lugs provide great traction and durability for gravel roads, trails, cyclocross, urban assault and even pavement - The MSO will fit on your cyclocross or gravel bike, commuter, or touring rig - MSO is the airport code for Missoula, Montana, home of the Adventure Cycling Association and the inspiration for countless cycling journeys - Designed to bridge the gap between pavement and blazing your own trail