Cyclocross Bikes
Used cyclocross bikes are built for the specific demands of CX racing — a 33mm tyre limit under UCI rules, steep geometry for quick handling, high bottom brackets for clearing obstacles, and frames designed to be shouldered on run-ups. The Cannondale SuperX, Trek Boone, Giant TCX and Specialized Crux (pre-gravel redesign) are the benchmarks. They also make excellent winter training bikes and fast commuters.
Cyclocross or gravel bike?
The two look similar but serve different purposes. CX bikes have steeper head angles of 72-73° for quick, aggressive handling at race pace, tyre clearance limited to the 33mm UCI maximum, and bottom brackets that sit higher for pedalling through ruts and over barriers. Mount points are minimal — no racks and few bottle cages — because races last 60 minutes. A gravel bike is more relaxed, clears wider tyres and is loaded with mount points for adventures. If you race CX, you need a CX bike; if you want versatility, a gravel bike or an endurance bike makes more sense.
What should I look for in a CX frame?
CX frames take massive abuse: crashes, shouldering, pressure washing, and riding in mud and sand. Carbon frames are lightweight for racing but need careful inspection for crash damage. Aluminium frames such as the Giant TCX SLR and Specialized Crux alloy are tougher and cheaper to replace, while steel is rare at race level but makes an excellent training bike. The details that matter are a flat section on the top tube for shouldering, cable routing that resists mud ingress, and a rear triangle with clearance for mud build-up.
Which brakes and gearing work best?
Disc brakes are universal on modern CX bikes — cantilevers have essentially disappeared from new models. Mechanical discs are fine for training, while hydraulics (Shimano GRX, SRAM Rival/Force) offer better modulation in muddy, wet conditions. On gearing, 1x is the CX standard: a 40T chainring with an 11-34 or 11-36 cassette covers everything, and no front derailleur means no chain drops in rough terrain. Shimano GRX and SRAM Force/Rival 1x are the go-to groupsets. Chain retention is critical, so look for a clutch rear derailleur and a narrow-wide chainring.
Tubular or tubeless wheels?
CX race wheels need to be light and laterally stiff. Carbon tubulars are the race standard because they can be run at very low pressures of 20-25psi without risking rim damage. Tubeless clinchers are increasingly competitive and far more practical for training, and aluminium wheels are sensible for training and local racing. Tyres are capped at 33mm for UCI racing, split between mud tyres (Challenge Limus, Dugast Rhino), all-round tyres (Challenge Chicane, Schwalbe X-One) and fast/dry tyres (Challenge Grifo). Most UK CX racing suits mud tyres from October to January.
What should I check buying used?
CX bikes live hard lives, and crashes, pressure washing and mud take their toll. Inspect frames carefully for crash damage, especially around the head tube, down tube and dropout areas, and check bottom bracket shells for creaking or play, as these bikes get submerged in puddles regularly. Examine disc brake rotor surfaces for deep scoring. Drivetrains wear fast in gritty conditions, so budget for a new chain and cassette on any used CX bike. Timing matters too: the used market spikes in autumn and crashes in spring, and the best deals come in spring when racers upgrade for next season and through the quiet summer months.