UCI Rules
🏛️Official — UCI2.4 Mountain Bike Specifications
Verdict
Wheel size: 29-inch (700c) is standard for XCO. 27.5-inch permitted. Wheel diameter must be between 55 cm and 74 cm including tyre.; Suspension: Front suspension fork standard. Full suspension (front and rear) permitted and increasingly common. No minimum or maximum travel restriction for XCO.; D...
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