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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-23-14, 07:55 PM   #1
thefolkman
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building a new bike.but im still pretty new to the game. and i need advice

what im curious about is will my 2014 Soma Rush track frameset be compatible with SRAM Omnium Crank/BB Set and my rear wheel is the Sun CR18 if that is important. will my chain line be correct? and if not will i be able to do a simple fix with spacers?
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Old 07-23-14, 09:19 PM   #2
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The Suntour CR18 is a rim, not a hub so depends on what the hub your are running.

I don't know 100% for sure but I'd wager that the Soma is a standard english BB shell though the omniums sometimes hit the chainstays of certain bikes.

Last edited by Huffandstuff; 07-23-14 at 10:34 PM. Reason: Don't use a spacer, bro.
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Old 07-23-14, 09:58 PM   #3
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Never use a spacer with omniums.
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Old 07-23-14, 10:34 PM   #4
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Originally Posted by prooftheory View Post
Never use a spacer with omniums.
My bad, I thought I heard somewhere(maybe on here?) about somebody using a spacer to help with hitting the chainstays. I have omniums on both my bikes but never ran into that problem, so was speaking second handedly.
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Old 07-23-14, 11:05 PM   #5
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My bad, I thought I heard somewhere(maybe on here?) about somebody using a spacer to help with hitting the chainstays. I have omniums on both my bikes but never ran into that problem, so was speaking second handedly.
You can use spacers with the aftermarket Phil Wood or Chris King GXP compatible BB but not with the stock one (unless you want to ruin your bearings).

At any rate, you won't have any clearance issues using Omniums on a Soma Rush.
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Old 07-23-14, 11:09 PM   #6
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You cab use spacers with the aftermarket Phil Wood or Chris King GXP compatible BB but not with the stock one (unless you want to ruin your bearings).

At any rate, you won't have any clearance issues using Omniums on a Soma Rush.
I thought the issue with the spacer was the nds spline not fully engaging? How is that different with the other bottom brackets?
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Old 07-23-14, 11:13 PM   #7
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They have thinner outboard cups and are specifically designed to be used with spacers to adjust chain line/clearance issues, where the stock Sram GXP is not.
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Old 07-23-14, 11:13 PM   #8
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Cool, gotcha.
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