FSA Gamma drive creeking

gtd.
gtd. Posts: 626
edited April 2012 in MTB workshop & tech
I have a old Gamma Drive MegaEXO crank set (19mm external cup bb) that creaks no matter how tight I do up the two bolts that clamp the left crank to the axle.

It creeks when the arm reaches 9 o'clock and again when it reaches 3 o'clock

Would a new crank arm fix this or am I better off just changing to a different chain set
Mountain: Orange Patriot FR, SubZero & Evo2LE.
Road: Tifosi Race Custom.
Do it all bike: Surly Disc Trucker 700c/29er

Comments

  • nicklouse
    nicklouse Posts: 50,675
    Bearings?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • gtd.
    gtd. Posts: 626
    I changed chainsets as it was creaking, it sounds like a square taper crank with a damaged taper or a cottered crank with a worn pin.

    It does it with the cranks removed from the bb, the drive side pedal is stuck in the crank so I tried using the other crank as leverage and it creaked then too.
    Mountain: Orange Patriot FR, SubZero & Evo2LE.
    Road: Tifosi Race Custom.
    Do it all bike: Surly Disc Trucker 700c/29er
  • gtd.
    gtd. Posts: 626
    Think I've worked it out...

    Where the pinch bolts go to grip the axle on the non drive side crank there is no longer a gap when the crank if fitted (where the security tab goes on a Shimano HT2 crankset.

    My Afterburner and Comet cranks have a gap when the crank is fitted this one doesn't so I cant tighten the crank pinch bolts up enough
    Mountain: Orange Patriot FR, SubZero & Evo2LE.
    Road: Tifosi Race Custom.
    Do it all bike: Surly Disc Trucker 700c/29er

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