My non-drive side crank has fallen off mid ride multiple times. Looking for some advice here. It looks like there is not enough “meat” for the crank to properly grab onto. Is this common?
Second picture shows how much the body of the crank over hangs. Half the width of the crank arm is squeezing air 😅
by DenimDansler
4 Comments
No that is not common, the crank is installed incorrectly
If you have any spacers on your bottom bracket, remove them, unless it’s the wrong size bracket. Also you have no crank bolt
How do the splines look on the crank arm? They might be stripped out.
I just went through this with a set of Shimano cranks. They randomly started falling off one week. I torque them back and put locktite on them to help, worked for a few weeks and then fell off again. The aluminum spines on the crank arm will shear off first. I replaced the crank arm and that worked for about a week. Frustrated I went to a bike shop and had explained the issue and had them install the crank arm hoping my torque wrench was just out of calibration. That one last a week, the bike shop contacted Shimano and explained I went through 3 arms in dozen rides and Shimano warrantied a full crankset replacement. Everything looked fine on the old crankset so I’m unsure what the issue was but it’s been a few months now and no issues since the full replacement.