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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 01-30-07, 03:03 PM   #1
StankApe
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07 Jake the snake front shifting issues

MY JTS drops the chain onto (but not engaged with) the smaller chainring when shifting at the front. Only in this direction (large chainring to small), and not even with terrible chainline. Since it's still newish, I'm letting the dealer sort it out.
The mechanic is convinced it's somehow due to either a mismatch b/w chainrings and 10 speed chain, or (his #1 theory) there's not enough diff b/w large and small chainrings. Chainrings are 36/46, freewheel is 105 12-25, cranks FSA gossamer compact megaexo.
Me, I'm thinking the FD just need to throw more. Simplest solution and all...
So...is the mechanic talking crapola? Is there a chance he's right?
Asking this before he goes swapping chainrings on me, thanks
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Old 01-30-07, 03:06 PM   #2
StankApe
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To clarify: not dropping the chain past the small chainring onto the bottom bracket, rather so the chain barely reaches the inner ring and kinda sits on the sideplates of the chain rather than the rollers.
TIA for any help
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Old 01-30-07, 04:46 PM   #3
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I have the same problem with a 30-year-old nishiki but going small to large. It's really weird.

Yeah, I got nothing to add but the anecdote. Sorry.
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Old 01-30-07, 07:26 PM   #4
Michel Gagnon
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STI has a few quirks, but you should be able to solve the issue by adjusting the lower limit screw. Also check the height of the derailleur cage (it should be about 3 mm above the large ring when it is set vis-à-vis it), and its angle (should be parallel to the rings).
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Old 01-30-07, 10:14 PM   #5
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Thanks Michel
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