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Old 05-20-19, 02:10 PM
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SRAM GXP bottom brackets with road cranksets in a 68mm bottom bracket shell needs no spacers. The Bikesdirect website specs are not super clear, but it appears that they may have used a "wide axle" version of that crankset. If that is the case, then it has the same axle(spindle) length as an MTB crankset and would use the two 2.5mm spacers that come with the bottom bracket. One spacer goes on each side.

Where there spacers on the original bottom bracket, or did you buy a bare frame? In the case of building up a bare frame, we would need to know what crankset you are using.
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