Vitus Sommet 290 Mountain Bike FrameEngineered and optimised to offer exceptional speed and all-terrain control, the Sommet 290 mountain bike (MTB) frame is a superb foundation on which to build your next high-performance enduro race bike. It features a durable and lightweight front triangle and a reliable and stiff alloy rear triangle, giving you the perfect balance of strength, agility and control at a low weight. Vitus has equipped it with a top-level Kashima-coated Fox Float X2 Factory Series rear shock that pairs well with the Sommet's adjustable flip-chip suspension system.The big-hitting Vitus Sommet 290 Mountain Bike frame has been enhanced to deliver stability where all around there is chaos. With volume added to the carbon front triangle, the bike feels calm and predictable with no compromise on agility.So, whether flinging yourself through the most technical Enduro tape or shredding your steepest local trails you still get that unforgettable rush. The rush that pushes you to explore your limits without overstepping the mark. This is for the full-face thrill seekers and the diehards. This is why you do it.As the sport of Enduro moves forward, challenging both bike and rider with more technical descents and punchy climbs, so the Sommet CRX has been engineered to keep pace. Extensive work has been done to improve small bump sensitivity, smoothing out the trail to keep you firmly in control and reduce pedal bob when you need to lay down more power. There’s a flip-chip to help you refine a setup that best suits your style, internal cable routing to keep everything tidy and the frame is well protected with robust guards on the downtube and chainstays.It’s not a bike for taking just any line, it’s a bike for taking the best line. A bike that tracks so accurately it rewards you with time. Time to line up the next obstacle and pick your route as the trail unfolds in front of you. This is the perfect foundation from which to build your dream Enduro bike.Key Features: Big hitting enduro frame with modern geometry 29" platform for flat out speed Adjustable flip chip to fine tune handling and your preferred feel Ultra-Smooth Fox Float X2 Factory Series shock Robust rubber downtube, seat stay and chainstay protection Durable clear protection film applied to high wear areasFeatures: Frame: Sommet T700 carbon front triangle, 6061-T6 alloy rear, Internal cable routing, post disc brake mounts, BSA threaded BB, Boost hub spacing - 148mm x 12mm thru axle. Axle Specifications: 180mm Length, 13mm Thread Length, M12xP1.0 Thread Pitch Rear Shock: Fox Float X2 Factory Series, Kashima coating, Grip2 air spring, 2 position lever, 205mm x 62.5mm, trunnion Headset: Acros AZX-212-CO R5, ZS44/28.6 upper and ZS56/40 lower to suit 1-1/8" upper tapered to 1.5" lower headtube Seat Screw: Vitus, 34.9mm Diameter Wheel Size: 29" Suspension Travel (MTB Only): 170mm Front, 162mm Rear Intended Use: Enduro Weight: 4.8kg (with shock)Buy Vitus Frames & Forks from Chain Reaction Cycles, the World's Largest Online Bike Store.
Vitus Sommet 290 Mountain Bike FrameEngineered and optimised to offer exceptional speed and all-terrain control, the Sommet 290 mountain bike (MTB) frame is a superb foundation on which to build your next high-performance enduro race bike. It features a durable and lightweight front triangle and a reliable and stiff alloy rear triangle, giving you the perfect balance of strength, agility and control at a low weight. Vitus has equipped it with a top-level Kashima-coated Fox Float X2 Factory Series rear shock that pairs well with the Sommet's adjustable flip-chip suspension system.The big-hitting Vitus Sommet 290 Mountain Bike frame has been enhanced to deliver stability where all around there is chaos. With volume added to the carbon front triangle, the bike feels calm and predictable with no compromise on agility.So, whether flinging yourself through the most technical Enduro tape or shredding your steepest local trails you still get that unforgettable rush. The rush that pushes you to explore your limits without overstepping the mark. This is for the full-face thrill seekers and the diehards. This is why you do it.As the sport of Enduro moves forward, challenging both bike and rider with more technical descents and punchy climbs, so the Sommet CRX has been engineered to keep pace. Extensive work has been done to improve small bump sensitivity, smoothing out the trail to keep you firmly in control and reduce pedal bob when you need to lay down more power. There’s a flip-chip to help you refine a setup that best suits your style, internal cable routing to keep everything tidy and the frame is well protected with robust guards on the downtube and chainstays.It’s not a bike for taking just any line, it’s a bike for taking the best line. A bike that tracks so accurately it rewards you with time. Time to line up the next obstacle and pick your route as the trail unfolds in front of you. This is the perfect foundation from which to build your dream Enduro bike.Key Features: Big hitting enduro frame with modern geometry 29" platform for flat out speed Adjustable flip chip to fine tune handling and your preferred feel Ultra-Smooth Fox Float X2 Factory Series shock Robust rubber downtube, seat stay and chainstay protection Durable clear protection film applied to high wear areasFeatures: Frame: Sommet T700 carbon front triangle, 6061-T6 alloy rear, Internal cable routing, post disc brake mounts, BSA threaded BB, Boost hub spacing - 148mm x 12mm thru axle. Axle Specifications: 180mm Length, 13mm Thread Length, M12xP1.0 Thread Pitch Rear Shock: Fox Float X2 Factory Series, Kashima coating, Grip2 air spring, 2 position lever, 205mm x 62.5mm, trunnion Headset: Acros AZX-212-CO R5, ZS44/28.6 upper and ZS56/40 lower to suit 1-1/8" upper tapered to 1.5" lower headtube Seat Screw: Vitus, 34.9mm Diameter Wheel Size: 29" Suspension Travel (MTB Only): 170mm Front, 162mm Rear Intended Use: Enduro Weight: 4.8kg (with shock)Buy Vitus Frames & Forks from Chain Reaction Cycles, the World's Largest Online Bike Store.
Vitus Sommet 290 Mountain Bike FrameEngineered and optimised to offer exceptional speed and all-terrain control, the Sommet 290 mountain bike (MTB) frame is a superb foundation on which to build your next high-performance enduro race bike. It features a durable and lightweight front triangle and a reliable and stiff alloy rear triangle, giving you the perfect balance of strength, agility and control at a low weight. Vitus has equipped it with a top-level Kashima-coated Fox Float X2 Factory Series rear shock that pairs well with the Sommet's adjustable flip-chip suspension system.The big-hitting Vitus Sommet 290 Mountain Bike frame has been enhanced to deliver stability where all around there is chaos. With volume added to the carbon front triangle, the bike feels calm and predictable with no compromise on agility.So, whether flinging yourself through the most technical Enduro tape or shredding your steepest local trails you still get that unforgettable rush. The rush that pushes you to explore your limits without overstepping the mark. This is for the full-face thrill seekers and the diehards. This is why you do it.As the sport of Enduro moves forward, challenging both bike and rider with more technical descents and punchy climbs, so the Sommet CRX has been engineered to keep pace. Extensive work has been done to improve small bump sensitivity, smoothing out the trail to keep you firmly in control and reduce pedal bob when you need to lay down more power. There’s a flip-chip to help you refine a setup that best suits your style, internal cable routing to keep everything tidy and the frame is well protected with robust guards on the downtube and chainstays.It’s not a bike for taking just any line, it’s a bike for taking the best line. A bike that tracks so accurately it rewards you with time. Time to line up the next obstacle and pick your route as the trail unfolds in front of you. This is the perfect foundation from which to build your dream Enduro bike.Key Features: Big hitting enduro frame with modern geometry 29" platform for flat out speed Adjustable flip chip to fine tune handling and your preferred feel Ultra-Smooth Fox Float X2 Factory Series shock Robust rubber downtube, seat stay and chainstay protection Durable clear protection film applied to high wear areasFeatures: Frame: Sommet T700 carbon front triangle, 6061-T6 alloy rear, Internal cable routing, post disc brake mounts, BSA threaded BB, Boost hub spacing - 148mm x 12mm thru axle. Axle Specifications: 180mm Length, 13mm Thread Length, M12xP1.0 Thread Pitch Rear Shock: Fox Float X2 Factory Series, Kashima coating, Grip2 air spring, 2 position lever, 205mm x 62.5mm, trunnion Headset: Acros AZX-212-CO R5, ZS44/28.6 upper and ZS56/40 lower to suit 1-1/8" upper tapered to 1.5" lower headtube Seat Screw: Vitus, 34.9mm Diameter Wheel Size: 29" Suspension Travel (MTB Only): 170mm Front, 162mm Rear Intended Use: Enduro Weight: 4.8kg (with shock)Buy Vitus Frames & Forks from Chain Reaction Cycles, the World's Largest Online Bike Store.
Vitus Sommet 297 Mountain Bike FrameThe Sommet 297 mountain bike (MTB) frame features a full-carbon front and alloy rear triangle, and it is intended for use with a 29" front and 27.5" rear wheel. This frame is optimised for enduro racing where it offers a sublime balance of high-speed control, exceptional pedalling efficiency and all-day riding comfort. It is also equipped with a 170mm-travel Kashima-coated Fox Float X2 Factory Series rear shock and features geometry that's ideal for use with 170mm-travel suspension forks.This big-hitting Vitus Sommet 297 Mountain Bike frame, specifically designed for a mullet wheel setup, has been enhanced to deliver stability where all around there is chaos. With volume added to the carbon front triangle, the bike feels calm and predictable with no compromise on agility.So, whether you're flinging yourself through the most technical Enduro tape or shredding your steepest local trails you still get that unforgettable rush. The rush that pushes you to explore your limits without overstepping the mark. This is for the full-face thrill seekers and the diehards. This is why you do it.Long-Travel Enduro Race Frame for Mixed-Wheel PlatformAs the sport of Enduro moves forward, challenging both bike and rider with more technical descents and punchy climbs, so the Sommet 297 has been engineered to keep pace. Extensive work has been done to improve small bump sensitivity, smoothing out the trail to keep you firmly in control and reduce pedal bob when you need to lay down more power. There’s a flip-chip to help you refine a setup that best suits your style, internal cable routing to keep everything tidy and the frame is well protected with robust guards on the downtube and chainstays. Dial in your perfect mullet setup by fitting a big party 29er in the front to keep the rolling momentum high and a business 27.5 at the back for traction and sharp acceleration.The Sommet is not a bike for taking just any line, it’s a bike for taking the best line. A bike that tracks so accurately it rewards you with time. Time to line up the next obstacle and pick your route as the trail unfolds in front of you. This is the perfect foundation from which to build your dream Enduro bike.Key Features: Big hitting enduro frame with modern geometry Mullet 29" front, 27.5" rear platform balancing speed and agility Adjustable flip chip to fine tune handling and your preferred feel Ultra-Smooth Fox Float X2 Factory Series shock Robust rubber downtube, seat stay and chainstay protection Durable clear protection film applied to high wear areasFeatures: Frame: Sommet T700 carbon front triangle, 6061-T6 alloy rear, Internal cable routing, post disc brake mounts, BSA threaded BB, Boost hub spacing - 148mm x 12mm thru axle. Axle Specifications: 180mm Length, 13mm Thread Length, M12xP1.0 Thread Pitch Rear Shock: Fox Float X2 Factory Series, Kashima coating, Grip2 air spring, 2 position lever, 205mm x 65mm, trunnion Headset: Acros AZX-212-CO R5, ZS44/28.6 upper and ZS56/40 lower to suit 1-1/8" upper tapered to 1.5" lower headtube Seat Screw: Vitus, 34.9mm Diameter Carbon Sommet Enduro Platform: Modern geometry with adjustable flip chip, improved suspension kinematics and a smile inducing ride Wheel Size: Mullet - 29" Front / 27.5" Rear Suspension Travel (MTB Only): 170mm Front, 170mm Rear Intended Use: EnduroBuy Vitus Frames & Forks from Chain Reaction Cycles, the World's Largest Online Bike Store.
Vitus Sommet 297 Mountain Bike FrameThe Sommet 297 mountain bike (MTB) frame features a full-carbon front and alloy rear triangle, and it is intended for use with a 29" front and 27.5" rear wheel. This frame is optimised for enduro racing where it offers a sublime balance of high-speed control, exceptional pedalling efficiency and all-day riding comfort. It is also equipped with a 170mm-travel Kashima-coated Fox Float X2 Factory Series rear shock and features geometry that's ideal for use with 170mm-travel suspension forks.This big-hitting Vitus Sommet 297 Mountain Bike frame, specifically designed for a mullet wheel setup, has been enhanced to deliver stability where all around there is chaos. With volume added to the carbon front triangle, the bike feels calm and predictable with no compromise on agility.So, whether you're flinging yourself through the most technical Enduro tape or shredding your steepest local trails you still get that unforgettable rush. The rush that pushes you to explore your limits without overstepping the mark. This is for the full-face thrill seekers and the diehards. This is why you do it.Long-Travel Enduro Race Frame for Mixed-Wheel PlatformAs the sport of Enduro moves forward, challenging both bike and rider with more technical descents and punchy climbs, so the Sommet 297 has been engineered to keep pace. Extensive work has been done to improve small bump sensitivity, smoothing out the trail to keep you firmly in control and reduce pedal bob when you need to lay down more power. There’s a flip-chip to help you refine a setup that best suits your style, internal cable routing to keep everything tidy and the frame is well protected with robust guards on the downtube and chainstays. Dial in your perfect mullet setup by fitting a big party 29er in the front to keep the rolling momentum high and a business 27.5 at the back for traction and sharp acceleration.The Sommet is not a bike for taking just any line, it’s a bike for taking the best line. A bike that tracks so accurately it rewards you with time. Time to line up the next obstacle and pick your route as the trail unfolds in front of you. This is the perfect foundation from which to build your dream Enduro bike.Key Features: Big hitting enduro frame with modern geometry Mullet 29" front, 27.5" rear platform balancing speed and agility Adjustable flip chip to fine tune handling and your preferred feel Ultra-Smooth Fox Float X2 Factory Series shock Robust rubber downtube, seat stay and chainstay protection Durable clear protection film applied to high wear areasFeatures: Frame: Sommet T700 carbon front triangle, 6061-T6 alloy rear, Internal cable routing, post disc brake mounts, BSA threaded BB, Boost hub spacing - 148mm x 12mm thru axle. Axle Specifications: 180mm Length, 13mm Thread Length, M12xP1.0 Thread Pitch Rear Shock: Fox Float X2 Factory Series, Kashima coating, Grip2 air spring, 2 position lever, 205mm x 65mm, trunnion Headset: Acros AZX-212-CO R5, ZS44/28.6 upper and ZS56/40 lower to suit 1-1/8" upper tapered to 1.5" lower headtube Seat Screw: Vitus, 34.9mm Diameter Carbon Sommet Enduro Platform: Modern geometry with adjustable flip chip, improved suspension kinematics and a smile inducing ride Wheel Size: Mullet - 29" Front / 27.5" Rear Suspension Travel (MTB Only): 170mm Front, 170mm Rear Intended Use: EnduroBuy Vitus Frames & Forks from Chain Reaction Cycles, the World's Largest Online Bike Store.
Vitus Sommet 297 Mountain Bike FrameThe Sommet 297 mountain bike (MTB) frame features a full-carbon front and alloy rear triangle, and it is intended for use with a 29" front and 27.5" rear wheel. This frame is optimised for enduro racing where it offers a sublime balance of high-speed control, exceptional pedalling efficiency and all-day riding comfort. It is also equipped with a 170mm-travel Kashima-coated Fox Float X2 Factory Series rear shock and features geometry that's ideal for use with 170mm-travel suspension forks.This big-hitting Vitus Sommet 297 Mountain Bike frame, specifically designed for a mullet wheel setup, has been enhanced to deliver stability where all around there is chaos. With volume added to the carbon front triangle, the bike feels calm and predictable with no compromise on agility.So, whether you're flinging yourself through the most technical Enduro tape or shredding your steepest local trails you still get that unforgettable rush. The rush that pushes you to explore your limits without overstepping the mark. This is for the full-face thrill seekers and the diehards. This is why you do it.Long-Travel Enduro Race Frame for Mixed-Wheel PlatformAs the sport of Enduro moves forward, challenging both bike and rider with more technical descents and punchy climbs, so the Sommet 297 has been engineered to keep pace. Extensive work has been done to improve small bump sensitivity, smoothing out the trail to keep you firmly in control and reduce pedal bob when you need to lay down more power. There’s a flip-chip to help you refine a setup that best suits your style, internal cable routing to keep everything tidy and the frame is well protected with robust guards on the downtube and chainstays. Dial in your perfect mullet setup by fitting a big party 29er in the front to keep the rolling momentum high and a business 27.5 at the back for traction and sharp acceleration.The Sommet is not a bike for taking just any line, it’s a bike for taking the best line. A bike that tracks so accurately it rewards you with time. Time to line up the next obstacle and pick your route as the trail unfolds in front of you. This is the perfect foundation from which to build your dream Enduro bike.Key Features: Big hitting enduro frame with modern geometry Mullet 29" front, 27.5" rear platform balancing speed and agility Adjustable flip chip to fine tune handling and your preferred feel Ultra-Smooth Fox Float X2 Factory Series shock Robust rubber downtube, seat stay and chainstay protection Durable clear protection film applied to high wear areasFeatures: Frame: Sommet T700 carbon front triangle, 6061-T6 alloy rear, Internal cable routing, post disc brake mounts, BSA threaded BB, Boost hub spacing - 148mm x 12mm thru axle. Axle Specifications: 180mm Length, 13mm Thread Length, M12xP1.0 Thread Pitch Rear Shock: Fox Float X2 Factory Series, Kashima coating, Grip2 air spring, 2 position lever, 205mm x 65mm, trunnion Headset: Acros AZX-212-CO R5, ZS44/28.6 upper and ZS56/40 lower to suit 1-1/8" upper tapered to 1.5" lower headtube Seat Screw: Vitus, 34.9mm Diameter Carbon Sommet Enduro Platform: Modern geometry with adjustable flip chip, improved suspension kinematics and a smile inducing ride Wheel Size: Mullet - 29" Front / 27.5" Rear Suspension Travel (MTB Only): 170mm Front, 170mm Rear Intended Use: EnduroBuy Vitus Frames & Forks from Chain Reaction Cycles, the World's Largest Online Bike Store.
Vitus Sommet 297 Mountain Bike FrameThe Sommet 297 mountain bike (MTB) frame features a full-carbon front and alloy rear triangle, and it is intended for use with a 29" front and 27.5" rear wheel. This frame is optimised for enduro racing where it offers a sublime balance of high-speed control, exceptional pedalling efficiency and all-day riding comfort. It is also equipped with a 170mm-travel Kashima-coated Fox Float X2 Factory Series rear shock and features geometry that's ideal for use with 170mm-travel suspension forks.This big-hitting Vitus Sommet 297 Mountain Bike frame, specifically designed for a mullet wheel setup, has been enhanced to deliver stability where all around there is chaos. With volume added to the carbon front triangle, the bike feels calm and predictable with no compromise on agility.So, whether you're flinging yourself through the most technical Enduro tape or shredding your steepest local trails you still get that unforgettable rush. The rush that pushes you to explore your limits without overstepping the mark. This is for the full-face thrill seekers and the diehards. This is why you do it.Long-Travel Enduro Race Frame for Mixed-Wheel PlatformAs the sport of Enduro moves forward, challenging both bike and rider with more technical descents and punchy climbs, so the Sommet 297 has been engineered to keep pace. Extensive work has been done to improve small bump sensitivity, smoothing out the trail to keep you firmly in control and reduce pedal bob when you need to lay down more power. There’s a flip-chip to help you refine a setup that best suits your style, internal cable routing to keep everything tidy and the frame is well protected with robust guards on the downtube and chainstays. Dial in your perfect mullet setup by fitting a big party 29er in the front to keep the rolling momentum high and a business 27.5 at the back for traction and sharp acceleration.The Sommet is not a bike for taking just any line, it’s a bike for taking the best line. A bike that tracks so accurately it rewards you with time. Time to line up the next obstacle and pick your route as the trail unfolds in front of you. This is the perfect foundation from which to build your dream Enduro bike.Key Features: Big hitting enduro frame with modern geometry Mullet 29" front, 27.5" rear platform balancing speed and agility Adjustable flip chip to fine tune handling and your preferred feel Ultra-Smooth Fox Float X2 Factory Series shock Robust rubber downtube, seat stay and chainstay protection Durable clear protection film applied to high wear areasFeatures: Frame: Sommet T700 carbon front triangle, 6061-T6 alloy rear, Internal cable routing, post disc brake mounts, BSA threaded BB, Boost hub spacing - 148mm x 12mm thru axle. Axle Specifications: 180mm Length, 13mm Thread Length, M12xP1.0 Thread Pitch Rear Shock: Fox Float X2 Factory Series, Kashima coating, Grip2 air spring, 2 position lever, 205mm x 65mm, trunnion Headset: Acros AZX-212-CO R5, ZS44/28.6 upper and ZS56/40 lower to suit 1-1/8" upper tapered to 1.5" lower headtube Seat Screw: Vitus, 34.9mm Diameter Carbon Sommet Enduro Platform: Modern geometry with adjustable flip chip, improved suspension kinematics and a smile inducing ride Wheel Size: Mullet - 29" Front / 27.5" Rear Suspension Travel (MTB Only): 170mm Front, 170mm Rear Intended Use: EnduroBuy Vitus Frames & Forks from Chain Reaction Cycles, the World's Largest Online Bike Store.
Nukeproof Giga Mountain Bike Water Bottle Bolt KitThis Giga Water Bolt Kit is super low profile and for use with the 2021 Giga Carbon Frame.Features: 4x FB-GAN-048 - Low Profile Water Bottle BoltBuy Nukeproof Frames & Forks from Chain Reaction Cycles, the World's Largest Online Bike Store.
K-Edge GoPro Interface Adapter Combo Bike MountConverts your K-Edge Garmin computer mount to be a computer and action camera combination mount. The interface works with any camera that utilises a GoPro interface.FeaturesCamera adapter mount with GoPro style interfacePositions the camera low and out-of-siteStabilises footage by removing plastic mount shakeComes with Lifetime GuaranteeWeighs 14gDimensions: 11 x 20 x 4cmBuy K-Edge Accessories from Chain Reaction Cycles, the World's Largest Online Bike Store.
LiteLok ONE Frame MountsThe ONE Frame Mounts make it even easier to carry your LiteLok ONE locks. Freeing up your hands to focus on the ride ahead, this frame mount holds your lock securely on your bike and ensures it's quiet and rattle-free throughout the duration of your journey.Features: Revolutionary design providing 2:1 fastening ratio Universally compatible with bikes and E-Bikes Easy fitting, with no additional tools required Innovative rubberised material won't damage your frame Rattle-free design makes no unwelcomed noises when riding Hybrid mount and strap provides extra security when fastenedBuy LiteLok Accessories from Chain Reaction Cycles, the World's Largest Online Bike Store.
Scicon 29er Single Wheel Mountain Bike BagSuitable for 26" and 29" wheels, this 29er Single Wheel Bag enables safe and easy transportation. Featuring double external lateral shields to protect your hub, tough carry handles, an ultra-resistant zipper, all wrapped in a heavy-duty nylon construction.Features:Material: Nylon 840Compatible with: 26" and 29" wheelsDimensions (LxHxW): 76x76x7cmClosure: ZipHandles: Carry handlesWeight: 716gBuy Scicon Accessories from Chain Reaction Cycles, the World's Largest Online Bike Store.
Abus MountZ Youth Cycling HelmetBe it a weekend mountain bike adventure or the daily ride to school, the Abus MountZ Youth Cycling Helmet provides young cyclists with stylish and protective performance whenever and wherever they pedal.At the heart of the high-quality MountZ Youth Cycling Helmet is Abus' protective In-Mould design technology. This construction technique has allowed Abus to keep the weight low but protection levels high. An EPS foam core provides vital shock-absorbing protection from impacts to the head during a crash.Bonded to the inner is a structurally strong and durable polycarbonate outer shell. This fends off those inevitable knocks and bumps you get from low overhanging branches and trailside overgrowth. It also adds durability from the every day (ab)use it will see from keen young cyclists.Cool ComfortAs young riders build speed and confidence, they'll quickly be pushing their ride limits and working up a good sweat. But with 5 inlet vents and 8 exhaust vents, they can look forward to cool airflow as the pace hots up. There's also a built-in bug mesh, keeping out those buzzing nasties while zooming along the trails. Zoom Ace Urban adjustment systemA good fitting helmet is essential for both safety and comfort. And here the Zoom Ace adjustment system makes it easy to get the fit just ride. With the rear dial attached to a full head ring, it's remarkably easy to get a secure and comfortable fit on every ride. It's ponytail compatible too, so long hair won't get in the way of comfort.Features:In-Mould - Lightweight, durable helmet with a long-lasting combination of EPS core and Polycarbonate shellBug mesh - Full protection from insectsPonytail compatibility - Perfect fit for people with long hairExcellent ventilation with 5 air inlets and 8 air outletsZoom Ace Urban - Finely adjustable adjustment system with handy adjustment wheel for a customisable fitAdjustable ring connected to adjustment system enclosing all of the headSize (head circumference) S - 48-54cm (weight 245g) / M - 52-57cm (weight 280g)Buy Abus Helmets from Chain Reaction Cycles, the World's Largest Online Bike Store.