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  1. #1
    mtbr member
    Join Date
    May 2004

    FSA Afterburner BB for 2004 Stumpy FSR

    Trying to cut some weight off of my wife's 2004 Stumpjumper FSR Expert. The FSA Afterburner crankset has been suggested to me, but it doesn't look like the chainline will match up.

    What is the best way to make this crankset match up with this bike? What BB should I try to find? We want to avoid bringing on any shifting issues due to changing the chainline.

    FSA Afterburner: Four arm, 104/64mm bolt circle diameter 7075 Torx T-30 alloy chainring bolts Q-Factor - 168 mm Spindle - Isis Drive 113mm Chainline - 48mm Weight - 625 grams

    Stock BB on Stumpy: Shimano ES-30 Octalink spline, 68mm shell, 121mm spindle. 50mm chainline.

  2. #2
    mtbr member
    Join Date
    Jun 2004
    The chainline should be close enough, if not an improvement. The only thing you need to check is if your front derailleur has enough adjustment to shift into the inner ring. You'll need to be able to adjust the derailleur cage towards the seat tube another 2 mm by adjusting the lower limit screw. If you run out of adjustment before the cage can move 2mm, then you'll have trouble shifting to your granny ring with the new crankset.

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