Hope bottom bracket problem (GXP) - ongoing with photo!

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frankspencer1979
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Hope bottom bracket problem (GXP) - ongoing with photo!

Postby frankspencer1979 » Thu Jan 10, 2013 16:29 pm

Have removed my Hope BB from my previous frame, where it was working perfectly, give it a wipe over, re-greased the threads and popped it into a new frame and now it doesn't work!

When I tighten up the bolt on the non-drive side crank, it pulls it all together and the whole thing seizes up. I can push the cranks round, but they don't spin freely, there's a lot of resistance.

I have the GXP conversion in the non-drive side as The cranks are Truvativ. The frame has been faced and I've got the correct amount of spacers so I can't figure what's happened.

The bearing in the non-drive side spins smoothly, the drive side a little less so, I popped the seal off and cleaned up in there and re-greased, but that didn't help. It's only as I tighten the centre bolt when things get really stiff. I'm not doing anything differently to when it was on my old bike, and I don't think I've done anything which should balls it up!

Anyone any ideas!?
Last edited by frankspencer1979 on Sat Jan 12, 2013 14:58 pm, edited 1 time in total.

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supersonic
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Re: Hope bottom bracket problem (GXP)

Postby supersonic » Thu Jan 10, 2013 16:31 pm

Mine are like this, just a standard GXP. The 1 bolt system locks and preloads the bearings, not the best way. Is it really hard to turn? They often free up a bit with use.

frankspencer1979
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Re: Hope bottom bracket problem (GXP)

Postby frankspencer1979 » Thu Jan 10, 2013 17:00 pm

It's not hard, i don't have to strain! But it does take effort, it would be noticeable resistance whilst pedalling. On the hope how to video where he installs gxp cranks, he "locks off" the bolt and the cranks still spin freely. I jyst don't get why it worked fine on the old frame but now it's gone dodgy!?

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bennett_346
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Re: Hope bottom bracket problem (GXP)

Postby bennett_346 » Thu Jan 10, 2013 18:00 pm

What is the shell width? Should be no spacers either side if it is 73mm, that would cause it to drag.

frankspencer1979
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Re: Hope bottom bracket problem (GXP)

Postby frankspencer1979 » Thu Jan 10, 2013 18:04 pm

It's 73mm, i have no spacer non-drive and chain device in lieu of drive side spacer (i measured it, it's 2.5mm like a spacer.) I have been told this is the correct set-up, and the hope instruction sheets suggest this layout.

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supersonic
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Re: Hope bottom bracket problem (GXP)

Postby supersonic » Thu Jan 10, 2013 18:36 pm

I'll have to double check that, thought it was no spacers at all.

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bennett_346
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Re: Hope bottom bracket problem (GXP)

Postby bennett_346 » Thu Jan 10, 2013 18:49 pm

Its definitely no spacers at all. That's why you're having issues.

Hope probably say driveside spacer because shimano cranks run a driveside spacer on 73mm shells.

frankspencer1979
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Re: Hope bottom bracket problem (GXP)

Postby frankspencer1979 » Thu Jan 10, 2013 18:52 pm

You're right! I'm happy to be wrong! :D Didn't realise there'd be a difference coz it's GXP. Took the Stinger out and now it all spins nicely. Will have to see how I get on without a chain device now.

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mrmonkfinger
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Re: Hope bottom bracket problem (GXP)

Postby mrmonkfinger » Fri Jan 11, 2013 14:50 pm

frankspencer1979 wrote:It's 73mm, i have no spacer non-drive and chain device in lieu of drive side spacer (i measured it, it's 2.5mm like a spacer.) I have been told this is the correct set-up, and the hope instruction sheets suggest this layout.


Despite posts to the contrary, you already had the correct spacer setup.

My guess:

1) the chain device plate is probably quite thick (thicker than a spacer) and its all now too wide for the GXP cranks.
or
2) maybe the BB needs facing, its a little over 73mm and too wide for the GXP cranks.

Incidentally, I could never get a GXP crank, a hope BB, a 73mm BB shell and stinger, to all play nicely together. There was no clearance for the chainrings.

I ended up getting an FSA crank in the end, which did work. By the time I'd sold on the chainrings, and the BB that came with the cranks, it only cost me about £20.

supersonic wrote:The 1 bolt system locks and preloads the bearings, not the best way.


There's no pre-load on GXP old chap - the cranks clamp around the non-drive bearing, and float in the drive side bearing.

FSA, Shimano, RaceFace, all went the preload route.

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bennett_346
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Re: Hope bottom bracket problem (GXP)

Postby bennett_346 » Fri Jan 11, 2013 15:27 pm

mrmonkfinger wrote:
frankspencer1979 wrote:It's 73mm, i have no spacer non-drive and chain device in lieu of drive side spacer (i measured it, it's 2.5mm like a spacer.) I have been told this is the correct set-up, and the hope instruction sheets suggest this layout.


Despite posts to the contrary, you already had the correct spacer setup.

My guess:

1) the chain device plate is probably quite thick (thicker than a spacer) and its all now too wide for the GXP cranks.
or
2) maybe the BB needs facing, its a little over 73mm and too wide for the GXP cranks.

Incidentally, I could never get a GXP crank, a hope BB, a 73mm BB shell and stinger, to all play nicely together. There was no clearance for the chainrings.

There are NO spacers on a 73mm GXP setup. I can guarantee you that. Hence you could never get it to work properly.

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mrmonkfinger
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Re: Hope bottom bracket problem (GXP)

Postby mrmonkfinger » Fri Jan 11, 2013 15:56 pm

bennett_346 wrote:There are NO spacers on a 73mm GXP setup. I can guarantee you that. Hence you could never get it to work properly.


the OP wrote:Have removed my Hope BB from my previous frame



A Hope BB with GXP converter requires one spacer (or chainguide or E type derailleur) for this setup.

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bennett_346
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Re: Hope bottom bracket problem (GXP)

Postby bennett_346 » Fri Jan 11, 2013 16:12 pm

I don't see how, surely its the axle width that decides the amount of spacers, which is fixed regardless of BB?


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bennett_346
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Re: Hope bottom bracket problem (GXP)

Postby bennett_346 » Fri Jan 11, 2013 17:01 pm

In that case the hope ones must be really narrow since the standard gxp bb doesnt use any. Either way chain devices don't seem to work on this setup so it's irrelevant.

frankspencer1979
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Re: Hope bottom bracket problem (GXP)

Postby frankspencer1979 » Fri Jan 11, 2013 20:10 pm

Previous Vitus frame was 68mm shell. I had one spacer non-drive side and the Stinger on the other, that worked nicely.

On the new frame (Piglet) it's a 73mm shell. I tried it with just the Stinger, and it all locked up pretty stiff. The Stinger looks thick, but measures at 2.5mm like a single spacer.

I've removed the Stinger, have no spacers at all and now it all spins nicely. Bennett, you be correct :wink:

Cranks are Truvativ X7.

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nicklouse
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Re: Hope bottom bracket problem (GXP)

Postby nicklouse » Fri Jan 11, 2013 21:03 pm

GXP is designed to not use any bearing preload. There should be a gap on the drive side.

Raceface. GXP. and 73mm bb shells and a chain device are in most cases a NONO.

Have fun.
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frankspencer1979
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Re: Hope bottom bracket problem (GXP) - ongoing with photo!

Postby frankspencer1979 » Sat Jan 12, 2013 15:02 pm

Still a bit of a problem, I've got it all tightened up, but there's a slight gap on the non-drive side, see photo's. I gues this is gonna allow water seepage into the shell and cause problems!? It doesn't seem right. But a spacer is defo too big, I'm confused.

Image
Drive side

Image
Non-drive side

Please ignore the mashed teeth, it's my first time! :oops:

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bennett_346
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Re: Hope bottom bracket problem (GXP) - ongoing with photo!

Postby bennett_346 » Sat Jan 12, 2013 18:18 pm

Are the threads chased?

frankspencer1979
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Re: Hope bottom bracket problem (GXP) - ongoing with photo!

Postby frankspencer1979 » Sat Jan 12, 2013 18:52 pm

I've not had them chased. But each cup can be screwed in all the way individually, it's only when they're both in that the above situation occurs (gap appears on the side which is screwed in second.)

The shell is defo 73mm, measured and Ragley state it as 73mm in the spec sheets; and the BB is designed for both 68 and 73mm so it should fit!? I don't know what's going on. I'm looking forward to sticking the decals on, I should be able to cope with that!

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sensi10
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Re: Hope bottom bracket problem (GXP) - ongoing with photo!

Postby sensi10 » Sat Jan 12, 2013 19:15 pm

I think the problem is that your meant to install the none drive side cup first , then the drive side cup 2nd which should leave the gap on the drive side which is where there should be a gap of 2.5mm for a spacer / chain guide. I think that the frame needs facing and that is why the crank is locking up.
Have you measured your frame with a vernier as if the frame has never been faced and there is paint on there it may be slightly over 73mm?


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