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  1. #1
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    Changing Sram 1250 chain rings

    I have a '12 Specialized Camber Comp 29er with SRAM S-1250, 10 x 2 speed XC Trail, PF30 spindle crankset. I rarely use the small 22t chain ring and would like to upgrade to a 26t ring. Would this work?

    New Truvativ Trushift Alloy 8 10sp Ring 64BCD x 26T Black | eBay
    2012 Specialized Camber Comp 29er
    Trek 9800 OLCV, XT upgrade 26er
    KHS Fleetwood
    Schwinn 20" Fastback 5 speed stick shift

  2. #2
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    57 hits no, input?

    How about this question what does "armxBCD: 4x64mm" mean? Is it 64mm between crank bolts?
    2012 Specialized Camber Comp 29er
    Trek 9800 OLCV, XT upgrade 26er
    KHS Fleetwood
    Schwinn 20" Fastback 5 speed stick shift

  3. #3
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    BCD = bolt circle diameter
    Which means if you could draw a circle through all 4 bolts it would be 64mm in diameter.

  4. #4
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    I'm pretty sure that SRAM 2x10 rings are 120mm BCD on the big ring and 80mm for the small ring. You'll need an 80mm small chain ring.

    I have two bikes, one set up as a 39/26 with a 12/36 cassette and one set up as a 38/24 with a 11/36. I personally prefer the 38/24, but I occasionally wander into some places with steep climbs.
    There's only one bigger sheep than manufacturer's - consumers! - AndrewTO

  5. #5
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    Thanks for the info
    2012 Specialized Camber Comp 29er
    Trek 9800 OLCV, XT upgrade 26er
    KHS Fleetwood
    Schwinn 20" Fastback 5 speed stick shift

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