Cyclocross bikes are designed to optimize performance during cyclocross racing. Cyclocross began as a means of offseason training for road cyclists and has grown into an independent sport. A cyclocross race is held on an off-road course consisting of multiple laps. One aspect of cyclocross is that there are multiple obstacles along the course that require cyclists to dismount and carry their bike in order to successfully negotiate. While not necessary to begin cyclocross racing, a dedicated cyclocross bike will lead to optimal performance.
Road Bike
Road bikes are not designed to handle the punishment of cyclocross racing and therefore are not typically recommended. The frame, fork and wheel set are designed to be as light as possible for road conditions, but lack the strength and durability for off-road conditions. The front fork and rear stays are designed for narrow tires, effectively preventing use of wide knobby tires utilized for off-road conditions. Lastly, dual pivot brake calipers are utilized on road bikes, which allow very little clearance between the tire and brake body. Lack of clearance leads to a buildup of mud and debris, which creates friction between the tire and brake.
Mountain Bike
Mountain bikes are designed to handle rough off-road conditions, but are heavier and slower in relation to cyclocross bikes. One of the main differences is the gearing used on a mountain bike. A mountain bike will be generally under geared for cyclocross racing. A mountain bike will be equipped with a triple chainring, 42/32/24, and an 11-36 rear cassette. Where as a cyclocross bike is typically equipped with a 46/38 double chainring and an 11-28 rear cassette. Mountain bike tires are also wider adding greater rolling resistance.
Cyclocross Bike
In the beginning cyclocross bikes were created by modifying road bikes. Due to the increased popularity of the sport of cyclocross bike manufacturers have developed cyclocross specific bikes. Cyclocross bikes utilize 700c wheels with wider knobby tires. The frames are sturdier in order to better handle off-road conditions. Greater tire clearance at the rear stays and the front fork and use of cantilever brakes allow for greater clearance preventing mud and debris from building up. Recently, manufacturers have started building cyclocross bikes with disc brakes to optimize braking in wet and muddy conditions. Gearing is lower than road bikes but higher than mountain bikes.
Cyclocross Racing
It is common for individuals to utilize mountain bikes when first participating in cyclocross. Racers quickly learn that they are at a distinct disadvantage racing on mountain bikes and purchase cyclocross bikes. While most local races allow the use of mountain bikes, they are prohibited in elite level races.
References
- "The Complete Book of Road Cycling and Racing"; Will Peveler Ph.D.; 2009
- Trek
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