Designed for hardpack XC and Marathon courses: the best trade-off between speed and grip. Low profile and compact tread pattern for riding quickly and confidently over hardpack terrain. The Scorpion™ XC H is the best choice for XC and Marathon courses where speed is the key factor. The tread pattern of the Scorpion™ XC H is made up of low densely packed knobs with reduced height to increase speed and limit deforming when cornering on hardpack terrain. SmartGRIP Compound is an advanced compound developed using motorsport experience. The single compound provides constant high grip performance both in wet and dry conditions even when the tread starts to wear. ProWall sidewall reinforcement technology increases puncture protection and improves handling at low pressures. An additional layer of Nylon fabric is applied over the casing sidewalls for extra protection and improved cornering stability. Casing: 120 tpi
The most versatile tyre in the Scorpion™ XC range: covering a wide range of uses while offering maximum support whether racing or training Medium profile tread pattern for riding quickly and confidently over a variety of terrains. The Scorpion™ XC M is the best choice for XC and Marathon courses where terrain can vary but speed is still the key factor. The tread pattern of the Scorpion™ XC M is optimised to compliment the properties of the rubber compound to offer uncompromising performance in variable conditions over differing terrain. The additional 'bridges' help support the knobs and improve mud shedding in wet conditions. SmartGRIP Compound is an advanced compound developed using motorsport experience. The single compound provides constant high grip performance both in wet and dry conditions even when the tread starts to wear. LITE tyres are dedicated to maximum rolling efficiency and suppleness using a lighter carcass to increase speed and riding feel. Casing: 120 tpi
Using experience from World Tour racing coupled with a constant desire for excellence the Pirelli engineers have developed the best performing all-round bicycle race tyre ever conceived by the iconic brand. The P ZERO™ Race is crafted to pack all the benefits of tubetype technology into a race-ready all-rounder which outperforms all cycling clinchers that Pirelli has created before tubulars included. After three years of development working with the fastest racers at the World Tour level including the male and female 2019 UCI World Champions Pirelli designed this new tubetype tyre with the new SmartEVO compound and the TechBELT casing technology to provide their Professional riders as well as all cycling enthusiasts with a superior product! Key Benefits Low rolling resistance Dry & wet grip Supreme comfort Puncture protection Mileage longevity Superior handling for extremely safe feeling Technology Smart Evo Compound - Latest generation blend of smart polymers to provide maximum grip with a low rolling resistance = Faster coupled with better control on any road or surface Techbelt Road – High performing casing structure with an added layer of high cut resistant fabric underneath the tread to provide superior puncture protection in a wide variety of conditions. Options Sizes: 700x26 28 Casing: 120tpi Tech: Techbelt Road Compound: SmartEvo Weight: 26c > 205g 28c > 225g Optimal Internal Rim Width: 26c > 19mm 28c > 19mm
The Pirelli Cinturato Velo TLR tyre is designed to be the ultimate all-rounder. With a tubeless ready bead, the Cinturato Velo provides fast rolling and supreme comfort combined with excellent grip in all conditions.Incredibly to easy to setup tubeless, meaning less time in the workshop and more time riding!Exceptionally low rolling resistance provides effortless speedSupremely grippy in all conditions, whether it's wet or drySupple casing provides excellent comfort yet is highly puncture resistantHighly durable rubber compound lasts extremely well over thousands of milesThe Cinturato Velo TLR provides excellent grip yet it also has extremely low rolling resistance. This is down to the clever SmartNET Silica rubber compound and Functional Groove Design that work together to generate excellent grip, while also keeping rolling resistance to a minimum. You really can have your cake and eat it with the Cinturato Velo TLR! The tyre's bead is tubeless ready and combines with the Armour Tech construction to offer a tyre that is incredibly supple to increase comfort over broken surfaces but is also highly puncture resistant, so cuts and tears are thing of the past. The tubeless ready folding bead also makes the Cinturato Velo a breeze to fit, meaning you'll spend less time in the workshop and more time out on the road enjoying their effortless performance. The Pirelli Cinturato Velo TLR is the ultimate all-round tubeless ready road tyres, offering exceptional grip, comfort, speed and puncture resistance in a lightweight and easy to fit package.
The Pirelli Cinturato Gravel RC is the gravel-racing specific tyre, derived from our experience in the biggest competitions around the World and the feedbacks of our PRO athletes. The tread design is inspired by the Scorpion XC RC, focussed on two key features: higher average speed on straight and fast lines, improved lateral grip when off-road cornering.Gravel racing specific tyre designed with feedback from Pro athletesSpeedGRIP Compound is a gravel-specific rubber formulation born from the Pirelli experience in the World Rally ChampionshipThe tread design is inspired by the Scorpion XC RCTechWALL Gravel features a cut-resistant 120tpi fabric all over the perimeter of the tyre still offering a supple riding feelingPLEASE NOTE: Despite one of the images showing this tyre to have a wire bead, this is not the case and it does have a folding bead.The SpeedGRIP Compound is a gravel-specific rubber formulation born from the Pirelli experience in the World Rally Championship where the performances of speed and grip on and off-road are crucial. This chemical formulation relies on the polymer matrix of the MTB-specific SmartGRIP Compound while lowering its rolling resistance. The gravel application requires good speed and on-off road capabilities, for this reason our engineers tweaked the compound features towards a better energetic efficiency with a little compromise on the grip, the result is a predictable compound with solid performances on and off road.Our engineers wisely combined the technologies derived from road-specific reinforced casings with the MTB-specific casings to obtain our most advanced gravel casing whose performances are obtained with the use of special fabric reinforcements and thicker layers of rubber in specific areas of the tyre. On the road the majority of punctures are caused by the penetration of sharp objects while off-road the most common punctures are caused by sidewall cuts, for this reason the TechWALL Gravel features a cut-resistant 120tpi fabric all over the perimeter of the tyre still offering a supple riding feeling.
The Pirelli Cinturato Gravel RC is the gravel-racing specific tyre, derived from our experience in the biggest competitions around the World and the feedbacks of our PRO athletes. The tread design is inspired by the Scorpion XC RC, focussed on two key features: higher average speed on straight and fast lines, improved lateral grip when off-road cornering.Gravel racing specific tyre designed with feedback from Pro athletesSpeedGRIP Compound is a gravel-specific rubber formulation born from the Pirelli experience in the World Rally ChampionshipThe tread design is inspired by the Scorpion XC RCTechWALL Gravel features a cut-resistant 120tpi fabric all over the perimeter of the tyre still offering a supple riding feelingPLEASE NOTE: Despite one of the images showing this tyre to have a wire bead, this is not the case and it does have a folding bead.The SpeedGRIP Compound is a gravel-specific rubber formulation born from the Pirelli experience in the World Rally Championship where the performances of speed and grip on and off-road are crucial. This chemical formulation relies on the polymer matrix of the MTB-specific SmartGRIP Compound while lowering its rolling resistance. The gravel application requires good speed and on-off road capabilities, for this reason our engineers tweaked the compound features towards a better energetic efficiency with a little compromise on the grip, the result is a predictable compound with solid performances on and off road.Our engineers wisely combined the technologies derived from road-specific reinforced casings with the MTB-specific casings to obtain our most advanced gravel casing whose performances are obtained with the use of special fabric reinforcements and thicker layers of rubber in specific areas of the tyre. On the road the majority of punctures are caused by the penetration of sharp objects while off-road the most common punctures are caused by sidewall cuts, for this reason the TechWALL Gravel features a cut-resistant 120tpi fabric all over the perimeter of the tyre still offering a supple riding feeling.
Introducing the Pirelli P Zero Race TLR tyre. Using experience from World Tour racing teams Mitchelton-Scott and Trek-Segafredo, coupled with a constant desire for excellence, the Pirelli engineers have developed the best performing tyre ever conceived by the iconic brand.Low rolling resistanceDry & wet gripSupreme comfortPuncture protectionMileage longevitySuperior handling for extreme safety feelingSizes: 700x24, 26, 28, 30cCasing: 120tpi, TLRTech: Techwall+Compound: SmartEvoWeight: 24c > 245g, 26c > 270g, 28c > 295g, 30c > 320gOptimal Internal Rim Width: 24c > 17mm, 26c > 19mm, 28c > 19mm, 30c > 19mmThe P Zero Race TLR is crafted to pack all the benefits of tubeless technology, grip, rolling and handling, into a race-ready all-rounder which outperforms anything Pirelli have done before, tubulars included. After three years of development working with the fastest racers at the World Tour level, Pirelli designed this new tubeless-ready tyre with the new SmartEVO compound to provide their Pro Riders, as well as yourself, with the best Pirelli tyre ever made!TechnologySmart Evo Compound - Latest generation blend of smart polymers to provide maximum grip with a low rolling resistance = Faster coupled with better control on any road or surfaceTechwall+ Road - New TLR casing technology with multiple layers of reinforcement to provide superior puncture protection within a lightweight structure framework = High performance all-rounder with best in class weight to protection ratio.Tubeless Ready - Rim compatibility developed under ETRTO standards and for modern wide rims.
The Cinturato™ Gravel Mixed Terrain is a gravel-specific tyre designed for mixed terrain where the surface varies between compact and unstable terrain and all intermediate types. The tread consists of knobs with average height and spacing to guarantee excellent performance on a wide range of terrains. The special SpeedGRIP Compound adds features of mechanical resistance and chemical grip without compromising the rolling efficiency. Cinturato™ Gravel Mixed Terrain is a high-performance tyre with unique characteristics of grip in all weather conditions be they dry or wet plus a high level of puncture protection. Technology/Features SpeedGRIP Compund Tubeless Ready 127 TPI Nylon bead-to-bead protection Weight: 700x35 - 430g 700x40 - 500g 700x45 - 550g 650x45 - 515g 650x50 - 540g
The Cinturato™ Gravel Mixed Terrain is a gravel-specific tyre designed for mixed terrain where the surface varies between compact and unstable terrain and all intermediate types. The tread consists of knobs with average height and spacing to guarantee excellent performance on a wide range of terrains. The special SpeedGRIP Compound adds features of mechanical resistance and chemical grip without compromising the rolling efficiency. Cinturato™ Gravel Mixed Terrain is a high-performance tyre with unique characteristics of grip in all weather conditions be they dry or wet plus a high level of puncture protection. Technology/Features SpeedGRIP Compund Tubeless Ready 127 TPI Nylon bead-to-bead protection Weight: 700x35 - 430g 700x40 - 500g 700x45 - 550g 650x45 - 515g 650x50 - 540g
Using experience from World Tour racing coupled with a constant desire for excellence the Pirelli engineers have developed the best performing all-round bicycle race tyre ever conceived by the iconic brand. The P ZERO™ Race is crafted to pack all the benefits of tubetype technology into a race-ready all-rounder which outperforms all cycling clinchers that Pirelli has created before tubulars included. After three years of development working with the fastest racers at the World Tour level including the male and female 2019 UCI World Champions Pirelli designed this new tubetype tyre with the new SmartEVO compound and the TechBELT casing technology to provide their Professional riders as well as all cycling enthusiasts with a superior product! Key Benefits Low rolling resistance Dry & wet grip Supreme comfort Puncture protection Mileage longevity Superior handling for extremely safe feeling Technology Smart Evo Compound - Latest generation blend of smart polymers to provide maximum grip with a low rolling resistance = Faster coupled with better control on any road or surface Techbelt Road – High performing casing structure with an added layer of high cut resistant fabric underneath the tread to provide superior puncture protection in a wide variety of conditions. Options Sizes: 700x26 28 Casing: 120tpi Tech: Techbelt Road Compound: SmartEvo Weight: 26c > 205g 28c > 225g Optimal Internal Rim Width: 26c > 19mm 28c > 19mm
Introducing the Pirelli P Zero Race TLR tyre. Using experience from World Tour racing teams Mitchelton-Scott and Trek-Segafredo, coupled with a constant desire for excellence, the Pirelli engineers have developed the best performing tyre ever conceived by the iconic brand.Low rolling resistanceDry & wet gripSupreme comfortPuncture protectionMileage longevitySuperior handling for extreme safety feelingSizes: 700x24, 26, 28, 30cCasing: 120tpi, TLRTech: Techwall+Compound: SmartEvoWeight: 24c > 245g, 26c > 270g, 28c > 295g, 30c > 320gOptimal Internal Rim Width: 24c > 17mm, 26c > 19mm, 28c > 19mm, 30c > 19mmThe P Zero Race TLR is crafted to pack all the benefits of tubeless technology, grip, rolling and handling, into a race-ready all-rounder which outperforms anything Pirelli have done before, tubulars included. After three years of development working with the fastest racers at the World Tour level, Pirelli designed this new tubeless-ready tyre with the new SmartEVO compound to provide their Pro Riders, as well as yourself, with the best Pirelli tyre ever made!TechnologySmart Evo Compound - Latest generation blend of smart polymers to provide maximum grip with a low rolling resistance = Faster coupled with better control on any road or surfaceTechwall+ Road - New TLR casing technology with multiple layers of reinforcement to provide superior puncture protection within a lightweight structure framework = High performance all-rounder with best in class weight to protection ratio.Tubeless Ready - Rim compatibility developed under ETRTO standards and for modern wide rims.
The Cinturato™ Gravel Hard Terrain is a gravel-specific tyre 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. The special SpeedGRIP Compound adds features of mechanical resistance and chemical grip without compromising the rolling efficiency. Cinturato™ Gravel Hard Terrain is a high-performance tyre with unique characteristics of grip in all weather conditions be they dry or wet plus a high level of puncture protection. Technology/Features SpeedGRIP Compund Tubeless Ready 127 TPI Nylon bead-to-bead protection Weight: 700x45 - 540g 650x45 - 505g
The Cinturato™ Gravel Mixed Terrain is a gravel-specific tyre designed for mixed terrain where the surface varies between compact and unstable terrain and all intermediate types. The tread consists of knobs with average height and spacing to guarantee excellent performance on a wide range of terrains. The special SpeedGRIP Compound adds features of mechanical resistance and chemical grip without compromising the rolling efficiency. Cinturato™ Gravel Mixed Terrain is a high-performance tyre with unique characteristics of grip in all weather conditions be they dry or wet plus a high level of puncture protection. Technology/Features SpeedGRIP Compund Tubeless Ready 127 TPI Nylon bead-to-bead protection Weight: 700x35 - 430g 700x40 - 500g 700x45 - 550g 650x45 - 515g 650x50 - 540g
The Cinturato™ Gravel Mixed Terrain is a gravel-specific tyre designed for mixed terrain where the surface varies between compact and unstable terrain and all intermediate types. The tread consists of knobs with average height and spacing to guarantee excellent performance on a wide range of terrains. The special SpeedGRIP Compound adds features of mechanical resistance and chemical grip without compromising the rolling efficiency. Cinturato™ Gravel Mixed Terrain is a high-performance tyre with unique characteristics of grip in all weather conditions be they dry or wet plus a high level of puncture protection. Technology/Features SpeedGRIP Compund Tubeless Ready 127 TPI Nylon bead-to-bead protection Weight: 700x35 - 430g 700x40 - 500g 700x45 - 550g 650x45 - 515g 650x50 - 540g
Using experience from World Tour racing coupled with a constant desire for excellence the Pirelli engineers have developed the best performing all-round bicycle race tyre ever conceived by the iconic brand. The P ZERO™ Race TLR is crafted to pack all the benefits of tubetype technology into a race-ready all-rounder which outperforms all cycling clinchers that Pirelli has created before tubulars included. After three years of development working with the fastest racers at the World Tour level including the male and female 2019 UCI World Champions Pirelli designed this new tubetype tyre with the new SmartEVO compound and the TechBELT casing technology to provide their Professional riders as well as all cycling enthusiasts with a superior product! Key Benefits Low rolling resistance Dry & wet grip Supreme comfort Puncture protection Mileage longevity Superior handling for extremely safe feeling Technology Smart Evo Compound - Latest generation blend of smart polymers to provide maximum grip with a low rolling resistance = Faster coupled with better control on any road or surface Techbelt Road – High performing casing structure with an added layer of high cut resistant fabric underneath the tread to provide superior puncture protection in a wide variety of conditions. Options Sizes: 700x26 28 30c Casing: 120tpi Tech: Techbelt Road Compound: SmartEvo Weight: 26c > 205g 28c > 225g 30c > 245g Optimal Internal Rim Width: 26c > 19mm 28c > 19mm 30c > 19mm
Cinturato™ Gravel S is the gravel tyre for soft and muddy terrain it is 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 tyre which is easy to crontrol and safe in every condition. Grip and safety are prioritized rather than the pure speed of racing-specific models. The SpeedGRIP Compound is a gravel-specific rubber formulation born from the Pirelli experience in the World Rally Championship where the performances of speed and grip on and off-road are crucial. This chemical formulation rely on the polymer matrix of the MTB-specific SmartGRIP Compound while lowering its rolling resistance. The gravel application requires good speed and on-off road capabilities for this reason our engineers tweaked the compound features towards a better energetic efficiency with a little compromise on the grip the result is a predictable compound with solid performances on and off road. Our engineers wisely combined the technologies derived from road-specific reinforced casings with the MTB-specific casings to obtain our most advanced gravel casing whose performances are obtained with the use of special fabric reinforcements and thicker layers of rubber in specific areas of the tyre. On the road the majority of punctures are caused by the penetration of sharp objects while off-road the most common punctures are caused by sidewall cuts for this reason the TechWALL Gravel features a cut-resistant 120tpi fabric all over the perimeter of the tyre still offering a supple riding feeling. SpeedGRIP Compund Tubeless Ready 60 TPI TechWALL protection Weight: 700-40c 540g
Pirelli Scorpion Enduro S MTB TyreSpecifically designed for the demands of modern enduro racing, the Pirelli Scorpion Enduro S is optimised to overcome the unpredictable terrain conditions on any given race day. Its tread pattern is designed to roll fast on the straights and bite deep when leaning into corners and when braking, giving a superb balance of high-speed control, traction and reliability. Versatile High-Performance Enduro Race TyreFrom dry loam to sticky mud, this mountain bike (MTB) tyre is an aggressive model that's tailored for extreme and loose terrain conditions. Pirelli has equipped it with a SmartGRIP Compound, which is a single compound that uses an advanced construction developed using experience from the motorsport industry. As a result, it delivers consistently high grip performance in both wet and dry conditions. Another highlight is its HardWALL sidewall technology, which features a bead-to-bead protection and a hard rubber insert right above the bead to ensure extra reliability for aggressive riding styles. This means it's well-equipped for racing with the latest bikes in mind. Its multiple reinforcements embedded in its casing also improve its structural reliability as well as offering more support at lower tyre pressures. Fast Rolling and High-Grip Mixed Condition PerformanceThe Scorpion Enduro S tread pattern is made up of deep and widely spaced knobs that bite into the terrain and provide maximum levels of grip. The height and rigidity of the tread increases grip in soft terrain guaranteeing traction and braking as well as excellent support when cornering. The specific spacing of the Scorpion Enduro S tread pattern also helps the tyre to get rid of mud. Aggressive Enduro tyre for extreme and loose conditions, from dry loam to sticky mud. The tall profile and widely spaced tread pattern cuts into and grips any kind of loose or soft terrain. The Scorpion Enduro S is the best choice for any Enduros with soft terrain, where grip and reliability are key factors. All-Terrain SmartGRIP CompoundSmartGRIP Compound is an advanced compound developed using motorsport experience. The single compound provides constant high grip performance both in wet and dry conditions, even when the tread starts to wear. HardWALL Sidewall TechnologyHardWALL features a bead-to-bead protection and a hard rubber insert right above the bead to ensure extra reliability for aggressive riding styles. Developed with the latest bikes in mind, these multiple reinforcements embedded in the casing improve structural reliability as well as providing more support at lower tyre pressures. Features: Compound: SmartGRIP Compound Sidewall Technology: HardWALL Use: MTB, Enduro Casing: 60tpi Single or Pair: Single Weight: 27.5x2.4": 980g; 29x2.4": 1050g; 29x2.6": 1180gManufacturer's Part Numbers: 3945700 Black 2.4" 29" 3833700 Black 2.6" 29" 3771700 Black 2.4" 27.5"Buy Pirelli Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.
The Scorpion H Lite MTB Hard Terrain is an MTB tyre 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 feeling while riding.2.2 LITE: rip-resistant rubber compound offering elevated mechanical resistance to reduce cutting and at the same time guarantee elevated performance2.4 LITE: rip-resistant rubber compound with 120 tpi reinforcement of the sides to offer greater protection against puncturing and cutting without sacrificing performance2.2: 120 tpi TUBELESS READY casing designed to dampen vibrations and make low pressure riding more stable with a wider footprint on the ground2.4: robust 60 tpi TUBELESS READY Nylon casing, designed to dampen shocks and vibrations and make low pressure riding more stable with a wider footprint on the groundGrip: the SmartGRIP rubber compound guarantees elevated grip on wet surfaces; weather is no longer an issue, no sacrificing grip for dry or wet conditionsHandling: the shape of the tyre has been optimised for modern rims made of aluminium or carbon with a wide internal grooveThe use of the special SmartGRIP Compound guarantees an elevated adaptability and at the same time resistance to tearing, offering elevated grip in all weather conditions, be they dry or wet: the best ally for your performance off-road. The SmartGRIP rubber compound guarantees elevated grip on wet surfaces; weather is no longer an issue, no sacrificing grip for dry or wet conditions. Handling: the shape of the tyre has been optimised for modern rims made of aluminium or carbon with a wide internal groove.
The Scorpion MTB Soft Terrain is a mountain-bike tyre designed for soft and unstable terrain. The tread features deep, widely spaced knobs designed to help the rider when the tyre tends to sink and to unload heavy build-up without flexing, thereby guaranteeing elevated riding precision and absolute grip even in difficult and straining conditions.2.2 LITE: rip-resistant rubber compound offering elevated mechanical resistance to reduce cutting and at the same time guarantee elevated performance2.4 LITE: rip-resistant rubber compound with 120 tpi reinforcement of the sides to offer greater protection against puncturing and cutting without sacrificing performanceGrip: the SmartGRIP rubber compound guarantees elevated grip on wet surfaces; weather is no longer an issue, no sacrificing grip for dry or wet conditionsHandling: the shape of the tyre has been optimised for modern rims made of aluminium or carbon with a wide internal groove2.2: 120 tpi TUBELESS READY casing designed to dampen vibrations and make low pressure riding more stable with a wider footprint on the ground2.4: robust 60 tpi TUBELESS READY Nylon casing, designed to dampen shocks and vibrations and make low pressure riding more stable with a wider footprint on the groundThe use of the special SmartGRIP Compound guarantees an elevated adaptability and at the same time resistance to tearing, offering elevated grip in all weather conditions, be they dry or wet: the best ally for your performance off-road. The SmartGRIP rubber compound guarantees elevated grip on wet surfaces; weather is no longer an issue, no sacrificing grip for dry or wet conditions. The shape of the tyre has been optimised for modern rims made of aluminium or carbon with a wide internal groove.
The Scorpion H MTB Hard Terrain is an MTB tyre 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 feeling while riding.2.2: rip-resistant rubber compound with 120 tpi reinforcement of the sides to offer greater protection against puncturing and cutting without sacrificing performance2.4: rip-resistant rubber compound, casing of robust 60 tpi nylon and additional 120 tpi reinforcement of the sides for greater protection against puncturing and cutting without sacrificing performanceGrip: the SmartGRIP rubber compound guarantees elevated grip on wet surfaces; weather is no longer an issue, no sacrificing grip for dry or wet conditionsHandling: the shape of the tyre has been optimised for modern rims made of aluminium or carbon with a wide internal groove2.2: 120 tpi TUBELESS READY casing designed to dampen vibrations and make low pressure riding more stable with a wider footprint on the ground2.4: robust 60 tpi TUBELESS READY Nylon casing, designed to dampen shocks and vibrations and make low pressure riding more stable with a wider footprint on the groundThe use of the special SmartGRIP Compound guarantees an elevated adaptability and at the same time resistance to tearing, offering elevated grip in all weather conditions, be they dry or wet: the best ally for your performance off-road. The SmartGRIP rubber compound guarantees elevated grip on wet surfaces so weather is no longer an issue, no sacrificing grip for dry or wet conditions. The shape of the tyre has been optimised for modern rims made of aluminium or carbon with a wide internal groove.