Truvativ Crankset problem.

I recently transferred over a truvativ gxp crankset from one frame to another and put in a new bottom bracket.

For some reason the cranks keep loosening up, I get about four spins in and I need to tighten them up again.

Does anyone have any ideas as to why this may be happening? Any recommendations on a solution other than loctite on the threads?

Cheers,

Shane
possibly not being tightened enough. Maybe the alloy crank bolt is on its way out. They have a habit of failing.
Yep, that happened to me, they're a dodgy design, loads of pressure on the bolt and not on the splines, replace the bolt and bring a spare one with you.

I've since thrown that chainset in the bin, where it belongs