Cracked Carbon Rims: Causes and Fixes for Gravel Riders

Carbon rims give gravel riders lightweight speed and stiffness, but they can also crack under certain conditions. Let’s look at why this happens and how to deal with it.

Common Causes
(1) Impact Damage: Sharp rocks or potholes can chip or crack the rim wall.
(2) Overinflated Tires: Exceeding the maximum tire pressure stresses the sidewall.
(3) Incorrect Tire Width: Using tires too wide for the rim can cause structural issues.

Solutions
(1) Small Chips: Sand and seal with epoxy to prevent water intrusion.
(2) Cracks: Stop riding immediately. Replace the rim or wheelset—repair is risky.

Prevention: Use correct tire pressure, avoid underinflated tubeless setups, and check rims after every rough ride.

Takeaway
A cracked rim is serious. Prevention through proper setup and careful riding saves both your wheelset and your wallet.