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  1. #1
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    Right BB lenght for Middleburn duo

    Hi.
    I own a Nitrous frame and i bought a Middleburn isis 32/42 Duo crankset,
    and im finding trouble getting the right chainlien.
    i used a FSA isi 73X113 bb, and got a 50mm chainline, than i tried a Race Face SRX 73x108 bb, in result the Crank's lockring was forced against the BB, so the crank couldnt move at all. im not sure if its only happen with this certain SRX BB or i sould try another 73X108 bb.

    Did some one experience this problem ?
    Can u advise for what isis BB i sould use ?

    thank's
    (sorry for my bad english.. im using a dictionary)

  2. #2
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    Unless Middleburn has done something odd that requires a different model, 113 has always been the correct length ISIS for a 135mm rear end (ie 47.5 mm chainline).

    Keep in mind, that running only two rings will move your chainline outboard 2.5mm...as chainline is defined as the measurement from bike centerline to the middle of the rings.

  3. #3
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    I got a 50mm chainline with a 113 bb, in result i had really bad shifting.
    ill try crank brothers 108 bb and see if it solve anything.

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