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PostPosted: Sat Mar 24, 2012 1:58 pm 
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Joined: Tue Aug 03, 2010 6:29 pm
Posts: 593
Hi all,

Just got hold of an SRAM S975 Quarq and I'm struggling a bit with the current BB in my bike. I was led to believe that the Quarq will work with Shimano GXP bottom brackets but mine doesn't seem to fit properly.

My problem is basically, when the crankset is fully tightened, the axle moves around in the BB. I've tried various spacers which solve the problem to some extent, although only because the non-drive side is then pressing tighter against the BB bearings. As soon as I apply any kind of torque to the crankset, the problem reoccurs.

At the moment I'm using a Shimano 105 5700 BB.

Would replacing the BB with this do any good?

http://www.ribblecycles.co.uk/sp/road-t ... RAMBTBR220" onclick="window.open(this.href);return false;

Any suggestions?

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Last edited by kevinkalis on Sun Mar 25, 2012 9:39 am, edited 1 time in total.

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PostPosted: Sat Mar 24, 2012 2:09 pm 
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Joined: Sun Oct 24, 2004 1:41 am
Posts: 574
Location: Toronto, Canada
The crank will only work with SRAM GXP bb's

The crank relies on the non drive bearing to have a smaller inside diameter to hold the system in place. Shimano and has the same diameter so it will not work.

SRAM bb's are pretty cheap so it is an easy fix


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PostPosted: Sat Mar 24, 2012 2:12 pm 
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Good times, so I'm right in assuming this BB will do the trick?

http://www.ribblecycles.co.uk/sp/road-t ... RAMBTBR220

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PostPosted: Sat Mar 24, 2012 2:28 pm 
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Location: Toronto, Canada
Yes


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PostPosted: Sun Mar 25, 2012 2:51 am 
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Joined: Sun Mar 14, 2010 2:53 pm
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Location: Montréal, Canada
I use the Chris King GXP BB on two different bikes. No issues. Let me know if you get it and need help with the spacers.

J

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PostPosted: Sun Mar 25, 2012 9:41 am 
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Picked up an SRAM BB yesterday. Everything seems to fit properly, I'll take it out for a test today.

On a side note, does it say explicitly anywhere that one needs a special type of BB, because I think they could've made that a bit more clear

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PostPosted: Sun Mar 25, 2012 12:13 pm 
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Location: Montréal, Canada
kevinkalis wrote:
Picked up an SRAM BB yesterday. Everything seems to fit properly, I'll take it out for a test today.

On a side note, does it say explicitly anywhere that one needs a special type of BB, because I think they could've made that a bit more clear


I've used the SRAM GXP.. It does the trick but I've blown out two of them. But they are cheap.

Quarq I don't think specifically says you have to get a GXP BB but they do say it's a GXP type crankset.. Just like they say some of their cranksets are BB30.. But if you don't follow this stuff closely, I can see how that would mean nothing to you..

J

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PostPosted: Mon Mar 26, 2012 4:54 pm 
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Location: New Hampshire
They don't really need to say explicitly that it needs a special BB, simply because it's a SRAM crank. All SRAM (and Truvativ, Bontrager, etc.) outboard-bearing cranks require a GXP-standard BB. Conversely, all Shimano (and FSA, Raceface, etc.) require a Shimano-standard BB. Neither company's cranks will work on the other's BBs, and vice versa.

Who led you to believe that a SRAM crank would work with a Shimano BB?


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