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Limit screws

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Limit screws

Old 09-30-08, 08:33 AM
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Limit screws

Hey Everybody...

Please be patient with me as I am relatively new to road cycling. I purchased A specialized Allez 2009 Triple, and I wanted to know which of the limit screws on the front derailleur are for High and low. The derailleur is a Sora triple. When in the lowest gears the chain rubs against inner cage. There are no markings on the derailleur that would indicate low or high. I assumed that the screw closest to the frame is for low limit? Any advice would be greatly appreciated!

Thank You......Steve
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Old 09-30-08, 08:43 AM
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Last edited by CastIron; 09-30-08 at 08:52 AM.
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Old 09-30-08, 08:49 AM
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You're correct SAKOD. However, being a new bike, have the shop properly set up the bike like they should have.
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Old 09-30-08, 12:59 PM
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CastIron, he asked about the FD.

SAKOD, don't jack with the limit screws unless you know what you're doing. If you want to find out, read through the whole procedure that CastIron linked to. FDs can be a pain to get right and the success of the whole operation depends on the first few steps. I try to leave the FD alone unless I have to change out the cable.

Otoh, I find that it's not unusual to have a shop set up the FD in a ... less than optimal manner.

If you're having a specific problem, ask in the Bicycle Mechanics forum. (It's not just for mechanics.) But since you provided good info and specific question, I'll try to answer here.

When in the lowest gears the chain rubs against inner cage.
Note what the setup procedure says about setting the lower limit screw. With no tension on the cable, chain in lowest gear, adjust the lower limit screw so there is about 1mm clearance between the chain and the inner cage. The screw should never need to be adjusted thereafter.

So either the initial setup was wrong, or the cage isn't moving over as far as it should when you shift down to the little ring. Have you (or anyone else) used the barrel adjuster on the down tube? Possibly to counteract another symptom?

Do you have to use the trim feature when in the middle ring and shifting between high and low rear gears?
Stupidity got us into this mess - why can't it get us out?

- Will Rogers

Last edited by DMF; 09-30-08 at 01:10 PM.
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