This tyre features a bold 120 tpi Nylon casing, vulcanised for added protection. Plus, it stands up brilliantly to the rough and tumble of such riding for a confidence-inspiring performance on every outing. Giving you fast rolling and cornering, this world-class tyre is a perfect upgrade for riders who want maximum control in all riding conditions. Technologies: Vulcanized Tubeless Ready (VTR): The highest level of performance offered by car, truck and motorcycle tyre manufacturers is a vulcanized tubeless system. While this is an old technology for cars and trucks, for bicycles it is relatively new and did not even have an internationally accepted design standard (ISO or ETRTO) until recent years. By eliminating the inner tube it is possible to lower the weight and create a softer, more comfortable, more efficient, lower rolling resistance tyre system by running lower tyre pressure. Challenge started introducing Vulcanized Tubeless Ready (VTR) tyres in recent years because the ISO and ETRTO standards for proper VTR tire and rim fit have finally been completed. These standards ensure your safety and your ability to fit and service the tyres with hand tools.
Open Tubular (Clincher) An open tubular is constructed using the same casing and tread materials and process as a tubular, but instead of sewing the casing together (closed), the sides of the tubular casing are folded around aramid fibre cords to produce beads. This ‘open’ design performs like a tubular, yet conveniently mounts like a standard clincher tyre. If combined with a Latex inner tube the ride becomes even closer to that of a tubular, offering excellent traction and cornering, low rolling resistance and shock absorption.
This tyre features a central ramped tread profile for easily acceleration, as well as aggressive side knobs for superb grip on corners and technical trail sections. This tyre is engineered to be robust, reliable and dependable - the Grifo is a very worthy addition to your racing/training arsenal. Classed as one of the best all-around cyclocross tyres every created by Challenge, this tyre excels in wet, dry, soft packed, rocky and root-infested course conditions Technologies: Vulcanized Tubeless Ready (VTR): The highest level of performance offered by car, truck and motorcycle tyre manufacturers is a vulcanized tubeless system. While this is an old technology for cars and trucks, for bicycles it is relatively new and did not even have an internationally accepted design standard (ISO or ETRTO) until recent years. By eliminating the inner tube it is possible to lower the weight and create a softer, more comfortable, more efficient, lower rolling resistance tyre system by running lower tyre pressure. Challenge started introducing Vulcanized Tubeless Ready (VTR) tyres in recent years because the ISO and ETRTO standards for proper VTR tire and rim fit have finally been completed. These standards ensure your safety and your ability to fit and service the tyres with hand tools.
Shorter valve inner tubes are ideal for wheels with rim depths of 24mm or 30mm but are not ideal for wheels with rim depths of 40mm or above (as the shorter valve would not extend out of the rim valve hole). Presta valve tubes are most commonly used for road wheels (700c) and on a few MTB wheels as the valves are thin, whereas Schrader valves are more commonly found on MTB wheels as the valve is larger and won't fit through 700c rim valve holes. Please note: if you are running a 25c Tyre you can use either the 20 - 25 Race 28 or the 25 - 32 race 28 options. The larger volume tube will give you the option to increase your tyre size at a later date and will run with less stress than the smaller size in a 25c tyre. Inner Tube Weights: Dunlop 40mm valve / 700 x 32-47 Tour 28: (182021) 200g Dunlop 40mm valve / 27 x 1 1/8 - 28x1 3/8x1 5/8 Tour 28: 200g Presta 42mm valve / 700x18-25c Race 28: 105g Presta 42mm valve / 700x25-32c Race 28: 125g Presta 42mm valve / 700 x 28-37c Tour 28: 155g Presta 42mm valve / 700 x 32-47c Tour 28: 200g Presta 42mm valve / 700 x 32-47c Cross 28: 155g Presta 40mm valve / 700 x 28-37c Tour 28: 155g Presta 40mm valve / 700 x 32-47c Tour 28: 200g
Couple this with a higher service mileage and a higher level of comfort thanks to the wider casing, and you get a tubular which is especially forgiving with today's ultra stiff racing bikes. Vectran™ Breaker Vectran is a synthetically manufactured high-tech fibre from a natural model. Like spider silk, Vectran is a liquid-crystalline polymer (LCP). Vectran is spun from melted liquid polymer Vectra and processed further to a multi-strand thread. Spider silk, like Vectran, has an enormous tear resistance at a very low weight – exactly the right properties to process into a premium Continental bike tyre as a puncture protection insert. A Vectran Breaker is lighter, more flexible and protects more effectively against cuts than the comparable nylon breaker. Vectran Breaker does not adversely affect the rolling resistance. BlackChili Compound Continental refine newly developed synthetic rubbers with natural rubber with the proven high-performance tread compound. They use these rubbers with special nanometric carbon soot particles, which are optimized in shape and surface properties for best uses for the intended tyre. BlackChili Compound reaches an unprecedented of performance. Tyres with BlackChili Compound reach an unprecedented level of performance. Compared to the previous best Activated Silica Compound, BlackChili tyres have 26% less rolling resistance, a 30 % higher friction value (grip) and a 5 % increase in mileage. TPS TyrePositioning System The narrower front tyre (22mm) provides reduced wind resistance and better handling. An adhesion-optimised tread mixture supplies the necessary grip especially for wet cornering. The wider rear tyre (24mm) offers better traction thanks to a larger contact area and at the same time more comfort. Thanks to the fast rolling, optimised tread mixture and larger contact area on the rear tyre, wear is reduced. The result is a pioneering front and rear tyre system for road racing – to be found in Conti’s GP Attack and Force tyres/tubs.
Couple this with a higher service mileage and a higher level of comfort thanks to the wider casing, and you get a tubular which is especially forgiving with today's ultra stiff racing bikes. Vectran™ Breaker Vectran is a synthetically manufactured high-tech fibre from a natural model. Like spider silk, Vectran is a liquid-crystalline polymer (LCP). Vectran is spun from melted liquid polymer Vectra and processed further to a multi-strand thread. Spider silk, like Vectran, has an enormous tear resistance at a very low weight – exactly the right properties to process into a premium Continental bike tyre as a puncture protection insert. A Vectran Breaker is lighter, more flexible and protects more effectively against cuts than the comparable nylon breaker. Vectran Breaker does not adversely affect the rolling resistance. BlackChili Compound Continental refine newly developed synthetic rubbers with natural rubber with the proven high-performance tread compound. They use these rubbers with special nanometric carbon soot particles, which are optimized in shape and surface properties for best uses for the intended tyre. BlackChili Compound reaches an unprecedented of performance. Tyres with BlackChili Compound reach an unprecedented level of performance. Compared to the previous best Activated Silica Compound, BlackChili tyres have 26% less rolling resistance, a 30 % higher friction value (grip) and a 5 % increase in mileage. TPS TyrePositioning System The narrower front tyre (22mm) provides reduced wind resistance and better handling. An adhesion-optimised tread mixture supplies the necessary grip especially for wet cornering. The wider rear tyre (24mm) offers better traction thanks to a larger contact area and at the same time more comfort. Thanks to the fast rolling, optimised tread mixture and larger contact area on the rear tyre, wear is reduced. The result is a pioneering front and rear tyre system for road racing – to be found in Conti’s GP Attack and Force tyres/tubs.
BlackChili Compound Continental refine newly developed synthetic rubbers with natural rubber with the proven high-performance tread compound. They use these rubbers with special nanometric carbon soot particles, which are optimized in shape and surface properties for best uses for the intended tyre. BlackChili Compound reaches an unprecedented of performance. Tyres with BlackChili Compound reach an unprecedented level of performance. Compared to the previous best Activated Silica Compound, BlackChili tyres have 26% less rolling resistance, a 30 % higher friction value (grip) and a 5 % increase in mileage.
Each and every inner tube passes a stringent 100% quality control inspection
Super lightweight butyl tube, even lighter than latex but not porous, so no need to reinflate every day. Can also be fixed with a normal puncture kit. The shorter valves on these inner tubes are ideal for wheels with rim depths of 24mm or 30mm but are not ideal for wheels with rim depths of 35mm or above (as the shorter valve would not extend out of the rim valve hole). Presta valve tubes are most commonly used for road wheels (700c) and on a few MTB wheels as the valves are thin, whereas Schrader valves are more commonly found on MTB wheels as valve is larger and won't fit through 700c rim valve holes.
If you want to get the miles in, but your streets aren't covered with the finest tarmac and you prefer the inconspicuous function of your tyres, then this is your tubular. DuraSkin Tyres with DuraSkin sidewall protection have to roll with the punches. These tyres are used in the harshest conditions. On messenger bikes, on epic travel bikes crossing continents without wearing through and in professional cycling they have to endure tough tests such as Paris-Roubaix. The high-quality polyamide fabric reliably protects the casing of the tyre and protects the tyre from the worst conditions. These tyres stand out with their brown sidewalls. The slick natural rubber tread is designed to perform well in wet/wintery conditions. SafetySystem Breaker The SafetySystem Breaker is made up of Kevlar reinforced, high-strength nylon fabric. Puncture and cut-resistant but nevertheless light and flexible, the tyre adjusts quickly to the surface below. Without raising the weight or rolling resistance noticeably, it protects the carcass against foreign objects and contributes to a longer lifespan of the tyre. Tyres with the SafetySystem Breaker also provide good comfort properties.
The long valve inner tube enables you to use these with deep section rims (40mm, 50mm and above) as the shorter valve would not extend out of the rim valve hole. Shorter valve inner tubes are ideal for wheels with rim depths of 24mm or 30mm. Road Inner Tubes with Presta Valves Presta valve tubes are most commonly used for road wheels (700c) and on a few MTB wheels as the valves are thin, whereas Schrader valves are more commonly found on MTB wheels as the valve is larger and won't fit through 700c rim valve holes. Inner Tube Weights: 700 x 20-25 (60mm valve): 105g 700 x 20-25 (80mm valve): 105g 700 x 25-32: 125g 700 x 32-47 Tour28: 200g 700 x 32-47 Cross28: 155g
The long valve inner tubes enables you to use deep section rims (40mm, 50mm and above) as the shorter valve would not extend out of the rim valve hole. Shorter valve inner tubes are ideal for wheels with rim depths of 24mm or 30mm. Presta valve tubes are most commonly used for road wheels (650c) and on a few MTB wheels as the valves are thin, whereas Schrader valves are more commanly found on MTB wheels as valve is larger and won't fit through 650c rim valve holes. 650c Wheel Sizing Be aware that when purchasing a 650c inner tube, tyre, or wheel from the Wiggle site that what you are buying is smaller than a more conventional road 700c inner tube, tyre, or wheel. Most road bikes nowadays come fitted, as standard, with 700c wheels (including inner tubes and tyres) and not 650c. A 650c inner tube or tyre WILL NOT fit a 700c wheel. Please read the 650c Wheel Sizing guide explaining the difference between 650c and 700c wheels. Based on ETRTO (European Tyre and Rim Technical Organisation) dimensions, 650c wheels are smaller than 700c wheels by about eight percent. Please, when on this page make sure you are buying the correct tyre size for you wheel. Check the sizing on your tyre before purchasing from this page. Tyre sizes tend to be printed on the sidewalls so please check before making a purchase.