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  1. #1
    Senior Member Ziemas's Avatar
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    Disc Brakes and Cro-Mo Fork Flex- Is this normal?

    I just noticed that my fork flexes inward when I brake on my newish bike. The fork is a 700c Kona Project Two Disc Fork (Cro-Mo) on a Kona Sutra frame with Avid BB7 brakes. Is this normal or safe?

    About a week ago I crashed hard enough to nearly taco a new Salsa Delgado rim. I didn't notice the fork flex before the crash, but that doesn't mean that it wasn't happening before the crash. Thanks.

  2. #2
    cs1
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    Senior Member cs1's Avatar
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    Quote Originally Posted by Ziemas
    I just noticed that my fork flexes inward when I brake on my newish bike. The fork is a 700c Kona Project Two Disc Fork (Cro-Mo) on a Kona Sutra frame with Avid BB7 brakes. Is this normal or safe?

    About a week ago I crashed hard enough to nearly taco a new Salsa Delgado rim. I didn't notice the fork flex before the crash, but that doesn't mean that it wasn't happening before the crash. Thanks.
    If the fork still has the V/Canti bosses, put stiffner or bridge on and bolt it down tight. Your forks shouldn't flex much then.

    Tim
    1999 Waterford RSE-11, 1995 Waterford 1200, 1989 Specialized Rockhopper Comp
    1989 Raleigh Technium, 1989 Schwinn Traveler, 1986 Specialized Rockhopper
    1984 Specialized Stumpjumper, 1986 Specialized Stumpjumper and just way too many projects to list.

  3. #3
    Senior Member mtbikerinpa's Avatar
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    If the fork has disc bosses it should not be able to flex beyond tolerances. A rigid fork will always have a certain ammount of "give" in order to absorb road vibration.
    Aviation Mechanic, Bike racer, Fitness Equipment Restorer

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