Hope BB GXP fitting issues?

FoxyRiderMTB
FoxyRiderMTB Posts: 4
edited May 2012 in Workshop
Hi - Newbie here :)

I'm fitting a GXP converted Hope road BB to my road frame. Running a SRAM Apex Groupset.

So std road shell - 68mm, Fitted admittedly in a rush before work this morning.

All assembled with no spacers - tightened and bearings overloaded. Stupidly removed and fitted 2 1mm spacers and the same.

My thoughts on what went wrong? - Took up the slack but didn't back off and then reload? Thinking about it and viewing the Hope video me thinks that the GXP spacers were not butting the axle and thus overloading the bearings (too tight to turn).

So - Go home later - remove cranks and cups - remove all spacers - reassemble - take up slack, loosen and then load to proper torque - Does that sound reasonable?

Any help would be great :)

Comments

  • maddog 2
    maddog 2 Posts: 8,114
    on a GXP system the nondriveside crank arm tightens onto the NDS axle and squashes (tightly) the NDS bearing. The driveside bearing isn't preloaded at all - it simple 'floats' on the axle. The cranks can't move laterally because the NDS crank is tight on the bearing.

    As to what's happening with your setup ...? well, if you've fitted the Hope adaptors correctly to the NDS bearing then the NDS crank arm will squash these on tightly, on installation. The DS should just then float in the bearing, as said. It's possible you BB shell is a tad wider than 68mm so the DS axle is squashing the DS bearing, causing stichtion...?

    If there BB isn't smooth to turn then take off all the spacers and re-fit. This will put less pressure on the DS bearing.
    Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer
  • FoxyRiderMTB
    FoxyRiderMTB Posts: 4
    Yup my thought precisely - I will take off the spacers (as it happens in both configs) - I also had to use a bit more force than usual to get the crank onto the DS bearing so I wonder if that's the issue i.e. not taking up enough slack and thus shortening the relative axle length on the NDS and thus overloading the NDS/DS bearings (DS overloaded as the axle/bearing fit it too tight?) ? I think I need to disassemble and make sure everything is easy to reassemble :) Thanks Maddog :)
  • FoxyRiderMTB
    FoxyRiderMTB Posts: 4
    Update: Fixed

    Somehow on fitting I managed to push the NDS bearing out of the shell a little as it was deforming out outer plastic seal - Knocked it back in with the soft end of the screw driver and hey presto all sorted :)

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