Bicycle Mechanics - Disc Brakes and Cro-Mo Fork Flex- Is this normal?

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Ziemas
09-19-05, 01:23 PM
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.

cs1
09-20-05, 03:41 AM
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
mtbikerinpa
09-20-05, 08:53 PM
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.