Hi! While riding back from class, my crank arm decided to fly off! I noticed no play at all, it just dropped off mid pedal stroke. Here’s the damage, do you guys think I need a new crankset? Obviously a new crank arm, but I can’t tell if the spline is done for or not lol. I’m new (and bought this bike used), so any info is appreciated! Thanks 🫡
by Happy_Improvement451
1 Comment
The axle tends to be hardened steel, the crank arm aluminium which is softer. Crank arm is toast but the axle looks good to go.
When you put your new one on make sure you tighten it fully to torque and recheck after the first couple of rides then add it to check as a regular maintenance item.
This happens when the retaining bolt isn’t tight enough and over time it cooks the interface leading to what you have there