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Story is as follows. I bought a 2nd hand Trek Remedy and the cranks that were on it were fine till I tried to change the pedals which removed the thread from the cranks as they were removed. I then bought a set of Raceface Aeffect cranks which I've got on a couple of other bikes. They were installed correctly and torqued to the correct spec but they came loose after about 10 miles and keep doing so. I've tried threadlock on the bolt but this doesn't seem to make any difference. What could be causing this? They only seem to loosen on rough rocky tracks. I've googled it and it doesn't seem to be related to the suspension design or anything. Have I just got a duff set of cranks? Could it be a bottom bracket issue?
My Turbine's came loose on a ride recently - just did em up tight. Then tighter. You can't overtighten as the thread "bottoms out".. or if it doesn't you may have a little spacer missing.
Interested to see if anyone has an answer to this. I had the exact same issue a couple of weeks ago in the alps on my Trek Remedy with Raceface Turbine cranks. Never had the issue before, just changed the BB to a hope BB and then had this issue.
I've cranked it up again and seemed to be OK (down the mountain of hell route so not a short route) so hoping it was just a one off...
Not got too many bb spacers in place have you? I had rf cranks do the same on my hardtail. It transpired I'd spaced the bottom bracket for 68mm instead of 73mm.
Interesting @dmw536. I've Aeffect cranks on my Spearfish and didn't have a problem until the original PF adaptor failed and I replaced it with a Hope one. The cranks would start working loose pretty quickly. I've ended up applying some serious force* to the bolt and so far it's not come undone.
* as in standing on the arm of the ruddy Allen key!
You should check that you've got all the spacers on the cranks and the little spacer thingy, then as mentioned check the BB itself isnt too wide. The cranks need to go onto the splines to a hard stop.
All spacers present and correct and sized ok as far as I can work out. I’ll give it some more torque and see how it goes.
Weird, as I said it seems to be OK now, off to Pila in a few days so time will tell! Just wish they had a bloody pinch bolt like shimano stuff. Puts my mind at ease.
This has only ever happened to me with Shimano cranks but, if I ever ride on them when they’re loose for whatever reason it kills them. You can tighten them as much as you like, within a ride or two they’re loose again and if I keep trying to tighten them at some point the non-drive side arm will just fall off.