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I'm trying to install a Truvativ Stylo GXP Giga X Pipe chainset into a Truvativ GXP Team BB (threaded external cups)
Single ring chainset.
The instructions suggest that for my 68mm shell I need one of the two supplied spacers on either side of the shell (73mm shell requires none)
BB installed, the chainset will not fit snug on the drive side against the BB cup as the main chainset axle will not pass through the non-drive side bearing, only the splines pass through.
From what little I've found out I believe that only splines are supposed to pass through the non drive side bearing but this leaves a gap between the bearing cup & chainset on the drive side.
The BB was only supplied with two spacers both of which are installed but it seems to require more.
Whats wrong?
you need 2 spacers on the drive side mate. If bikeradar was working i'd show you the thread i had up the same.
Is that two on the drive side & one on the non drive side?
That was the case for me yes. I'm far from an expert on BB's... but that was what the experts told me when i was running/swapping a GXP and it worked OK.
I can't remember the details but when I installed mine there was a gap between one of the flush surfaces on the cranks, and the bearing. I don't *think* its wrong (there is a lip on the axle which won't pass through the inner diameter of the bearing)
This might help from about 1:00 in
Truvativ bearings are not very good, so you will be replacing them sometime soon.
Thanks, looks like the instructions are wrong then - three spacers are required for the 68mm shell - 2x drive, 1x non-drive side.
Nothing's wrong with your set-up, there's supposed to be a gap on the drive side. GXP is designed so that the non drive side bearing is clamped by the left crank and the step on the axle, this prevents any chance of the bearings being pre-loaded(and then destroyed early in their lives)due to poor installation.You may get away with fitting an extra spacer on a 73mm shell(it may not leave much thread engaged on a 68), but if it's too thick then you'll pre-load the bearings and reduce their life.
Coatesy - thanks, noted, but the gap on the drive side looked bigger than a spacer thickness - I'll experiment tonight.