Join Date: Jul 2008
Location: Melbourne, FL
Bikes: 1988 Miyata 512 (retired), 2003 Specialized Stumpjumper, 1990's Bob Jackson ser#20602 (Messina, I think)
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Cinelli-style sloping crown fork. Diagnosis please.
Well, I bought this great Bob Jackson, used, this summer. Since then I've noticed very strong "speed wobble" except it happens even at like, 10 mph. Blazing fast, I know.
I thought maybe the frame was too noodly or I was too fat. Today I read somewhere (maybe something from Jobst Brandt?) and someone mentioned they had a cracked fork and it made that type of wobble worse. Then I definitely read something by JB that said Cinelli-style internally lugged forks can crack. Then I'm thinking about how it sounds like my stem has been creaking/popping when I stand up to pedal...
I looked over at my bike across the office...
I rode carefully home and pulled the wheel out of the front fork and here's what I saw where the right leg meets the crown:
I am telling myself this is just a crack in the paint, but I fear it is the leg separating from the crown.
What do you see?
If the fork is trashed, would that have been causing my wobble problem or is that more a function of the geometry of the frame and fork?