You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
Hi. I have a drive side crank arm that is wobbling despite the crank bolt being nice and tight. It's a Middleburn RS7 on a new Superstar Isis BB. I'm wondering if there's a way of tightening uo the arm? Is there such a thing as an additional washer that you can fit to tighten up the fit? Ta...
Has it developed the wobble over time, or was the wobble there since the crank/BB was installed?.
It's become wobbly after just a couple of rides. I'll remove the arm fully, clean/grease and re-fit I think. I am using a crank bolt with an integrated washer but the washer looks worst for wear after just a few rides...
Unfortunately, when the splines in the aluminium arm are even a bit worn, it will always end up loosening after a ride or two, however hard you crank up the bolts.
I've got some RaceFace Aeffect cranks that have gone the same way 🙁
If they're new you should be able to tell visually which has damage that's causing the wobble, or something causing the bolt to not fully engage. ISIS bbs have a bad rep, not entirely deserved, but it shouldn't be bad from the outset.
Removed the crank arm only to find a section of it has completely sheared off. No wonder it was wobbly. Looks like I now need to replace the cranks