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Front Derailleur Slipping

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Front Derailleur Slipping

Old 05-06-11, 11:17 AM
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Front Derailleur Slipping

I just bought a used Klein Performance Sport/Tourer.

The Deore front derailleur (band type) does not stay in place. I already tighten it as much as I could, but still slips after a few miles of ridding/shifting.

Any tips on how to fix this? What's a good replacement Derailleur?

Thanks in advance!
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Old 05-06-11, 11:53 AM
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Maybe a mismatch between seat tube diameter and clamp size?? Measuring the seat tube and comparing with the clamp size (imprinted on inner surface of clamp) would clear this up. It doesn't take a lot of clamping strength to keep a FD in place.
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Old 05-06-11, 11:56 AM
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Is there a shim under the band? The tubing might be slightly too small for the clamp to engage properly. Shimano should have a set of adapters to let the derailer work with smaller tubes, but if the fit is really close, I don't know how thin they come.
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Old 05-06-11, 12:01 PM
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No. No shim in there. The seller said its all original. I spent my ride yesterday adjusting it to no avail.
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Old 05-06-11, 12:15 PM
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you can always use a piece of a old intertube for a shim, just cut it to the size of the clamp.
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Old 05-06-11, 12:17 PM
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Always take what the seller says with a grain of salt. Probably need a really thin shim. Own a caliper? If not, buy one, its one of those must have tools. Can pick up a digital one at Harbor Freight for well under $20.

You will need this info anyway if you decide to buy a replacement.
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Old 05-06-11, 01:25 PM
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Okay, I got it dialed again. I used an inner tube shim as mentioned. Will try to ride a few miles tomorrow and see if it hold.
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