the pedals on my mtb won’t stay tight, and i’m on my second crankset because of it. after stripping my last one, my pedals were torqued to 40nm and greased when the new one came in, yet on my ride today both of them were loose, with one nearly half way out on the threads. yet, when i removed my pedals and cleaned them there seemed to be no damage anywhere. is there any explanation for this? my thought is maybe the pedal washers are interfering in some way? for context, i’m running crankbrothers stamp 7 pedals on a sram gx crankset.
i’ve also been learning trials on this bike and maybe the constant jumping off of the pedals is gradually loosening them? either way, i’ve been pretty frustrated with this and want to get to the bottom of it.
by Lopsided-Delivery-59
6 Comments
Is it both pedals or just one of them?
Have you got another set of pedals that you can compare the threads to? Likewise for the cranks? Another set of (known undamaged) cranks you can compare to?
I wonder if your Stamps had a manufacturing issue on the pedal threads that mean they’re causing damage to the crank threads?
Bad bearing in pedal?
You don’t grease them, you put some loctite on them……..but not grease…
Make sure that the crank arm marked R is on the right side (drive side) of the bike and that the pedal marked R is screwed into it.
I thought pedals were supposed to be torqued to 55Nm? Trials will put unusual loads, try 55Nm and blue loctite
Are you sure your torque wrench is accurate? People just buy them use them and assume it’s fine.