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Front derailleur slipping on seat tube

Old 03-20-10, 03:39 PM
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Front derailleur slipping on seat tube

I have a Pedal Force RS2 and I'm using a Parlee derailleur clamp but I cannot for the life of me get it to not slip. After just a few shifts it has moved and my shifts become horrible. If I keep riding, eventually the derailleur makes contact with the big chain ring. I'm using FSA carbon paste and torquing to 6nm which is the max Pedal Force recommends. Ideas?
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Old 03-20-10, 03:56 PM
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try roughening up inner side of the clamp?
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Old 03-20-10, 04:11 PM
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I'll ask the obvious. Is the clamp the correct size for the seattube and, is there a gap where the clamp halves meet when it is tightened in place?
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Old 03-20-10, 04:21 PM
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AEO: nope haven't tried that but will.
HillRider: yes, it is the correct size.
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Old 03-20-10, 05:36 PM
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You could try a shim made out of an old inner-tube to allow the clamp to 'bite' harder.
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Old 03-20-10, 09:12 PM
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tighten to 7nm
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Old 03-20-10, 09:40 PM
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You're not the first with this problem. It some cases it simply doesn't clamp firmly enough. You could try helping it with some adhesive or shim or other tricks, or you can do what lot's of others have done and replace it with a metal adaptor.
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Old 03-20-10, 10:37 PM
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Originally Posted by Panthers007
You could try a shim made out of an old inner-tube to allow the clamp to 'bite' harder.
This. If you cut it slightly smaller than the clamp, it'll be invisible.

Bet it works a treat.
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Old 03-21-10, 03:26 AM
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That clamp is known to suck, the only thing it does is look cool. Go buy a normal derailleur clamp from shimano/sram/generic and install that. Do not shim anything - you've already maxed out

1) torque on the bolt
2) and carbon paste has reduced the necessary torque *already*, which is not enough.
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Old 03-21-10, 05:11 PM
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Thanks for all the replies. I'll dig out my metal clamp and try that.
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