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  1. #1
    Surf Bum
    Join Date
    Aug 2008
    Location
    Pacifica, CA
    My Bikes
    Vintage Trek, Vintage Diamond Back Mountain Bike, Bianchi Axis CrossBike
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    SRAM Rival crank gxp bb - spacer needed?

    I just installed a rival crankset on my Bianchi Axis cyclocross bike today and have nearly zero clearance between the driveside crank arm and the chainstay. It doesn't hit, but as I can't even slide a credit card between there, I'm worried it may hit under some conditions...

    This is my first experience with SRAM so I've read the install directions and what not and was under the impression that no spacers are needed on "road" frames, but perhaps because of the wider chainstays on a cross frame I need one?

    Also, I have tons of clearance on the non-driveside, which makes me wonder:
    a) if that's how much I should have on both sides or if it's normal for it to be uneven,
    b) did I screw something up on the install that accounts for this unevenness (the cups are marked and so i know i put them in the right side of the frame)
    c) is the frame bent (though it rides perfectly straight even at 40mph downhill)

    Here are some pics:

    drive side:


    non-drive side:

  2. #2
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
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    I would check the rear triangle alignment.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  3. #3
    Surf Bum
    Join Date
    Aug 2008
    Location
    Pacifica, CA
    My Bikes
    Vintage Trek, Vintage Diamond Back Mountain Bike, Bianchi Axis CrossBike
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    Damn. I don't have an alignment gauge but using the string around the headtube method, my rear triangle is indeed fubar. It's off 5mm (measured at the seat tube) and looking at the chainstays and dropouts shows more irregularities (i think the driveside is higher off the ground). The more I look at it, it looks like several things are messed up. The bike has never been crashed so...maybe the damn thing left the factory like this. Worth a try at a warranty claim I guess.

    Guess I'll have to put back on the mtb crankset (wider q-factor means there is more crank-arm to chainstay clearance).

    Wish I could edit the original thread title now. Oh well.

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