Sram/Truvativ GXP BB

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rbrtwyn
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Joined: Thu Dec 09, 2004 1:57 pm

by rbrtwyn on Mon Feb 12, 2007 9:08 pm

Does anyone know what size bearings Sram/Truvativ uses on their new GXP BB? I read somewhere that they use 2 different sizes but I can't find anything that says for sure what the two sizes are.

Thanks.
Last edited by rbrtwyn on Mon Feb 12, 2007 9:28 pm, edited 1 time in total.
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by Weenie on Mon Feb 12, 2007 9:08 pm


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RollinOn27s
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by RollinOn27s on Mon Feb 12, 2007 9:17 pm

As the two openings are of different sizes, yes, I believe the bearings are also of different sizes.
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rbrtwyn
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by rbrtwyn on Mon Feb 12, 2007 10:38 pm

Thanks. Does anyone know what the 2 bearing sizes are?
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Ti
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Location: CALIFORNIA

by Ti on Tue Feb 13, 2007 4:17 am

As far as I know ,they are the same as Shim and FSA.Race Face uses two different sizes.The size should be 37x25x7mm.
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Hyde
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by Hyde on Tue Feb 13, 2007 4:50 am

I can help..."ish". I pulled my extra bottom bracket out of the tool box & took some measurements & did some inspecting...short of pulling the bearings. Well, Truvativ are sly. They have their own dust covers on the bearings with no size defining markings. Here are the measurements I took with my Calipers.
The 2 bearings look to be identical, however the non drive side bearing has a sleeve in it to make the ID Smaller. Here are the approx measurements...
OD 1.45"
ID .940"
ID w/ Sleeve .870" (non drive side)
Width .35"
Sleeve Width .50

Hope this helps
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Auk
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by Auk on Tue Feb 13, 2007 5:04 am

Just got burned by this the past month. Same bearing but, as stated above me, the non-drive has a pressed in sleeve that forces you to buy the Truvative/Sram bearings/cups.

Really no way around it, as there is slop on the spindle otherwise.
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Hyde
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by Hyde on Tue Feb 13, 2007 5:06 am

Looks like it is a "6805" by matching my measurements to the closest bearing size
http://www.vxb.com/Merchant2/merchant.m ... gory_Code=
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Hyde
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by Hyde on Tue Feb 13, 2007 5:10 am

Auk wrote:Just got burned by this the past month. Same bearing but, as stated above me, the non-drive has a pressed in sleeve that forces you to buy the Truvative/Sram bearings/cups.

Really no way around it, as there is slop on the spindle otherwise.


Why can you not press out the sleeve & repress it into the new bearing? Take it to any decent auto mechanic & he should be able to do it in a couple minutes or point you in the direction of someone with a press who can.
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by Weenie on Tue Feb 13, 2007 5:10 am


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rbrtwyn
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by rbrtwyn on Tue Feb 13, 2007 5:50 am

Thanks for all the help. Another reason this board is the best!
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