Crank has worked loose a 2nd time...

mac_man

Only had the bike since end of August.

It's fitted with (I think) Truvatic Blaze cranks. The arm on one side has worked loose twice. 1st time I figured it was possibly dodgy initial build. So it was re-fitted and tightened up.

But same thing has happened again. I've refitted and tightened up pretty hard. (well as hard as I can make it).

So my question is... should I send them back for a new set, or is this something that can happen and I should be checking them every time I go out?

Fortunately the stupid thing came off at low speed.

hate to think what could have happened... as we were pootling around Lee Quarry most of the day, which is wall to wall rock!!!!

supersonic

Is it powerspline, square taper? If so refit, use loctite and tighten. If it comes off again then replace it.

mac_man

Yep... tis Powespline.

And by Loctite I presume you mean their threadlock and not superglue

So just add some threadlock to the thread on the bolt, and screw in?

What does it do/how does it work?

Am presuming I'd be able to get the damn thing off in the future

supersonic

It may just keep the bolt in the correct position.