Following the tried and tested tire hugging design of the MTB Mudhuggers, the GravelHugger is designed to fit most fork + wheel + tire (up to 50mm wide) combos for your Gravel Bikes. To reduce single-use plastic waste, and make fitting and removing easier, the GravelHugger is supplied with nitrile O-rings (70mm sizes for flat blade type and 50mm for traditional round steel forks).