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Old 03-27-08, 06:02 AM   #1
coasting 
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front derailleur band size

The smallest band size on shimano 105 FD is 28.6mm. I thought this was the standard diameter but on my bike it is a bit too wide. My seat tube is reynolds 531 but seems to be a tiny bit under 28mm. This is smaller than standard isnt it?

I tightened the screw all the way and the clamp is completely shut but when I pull on the shifter over time the tension pulls the FD down about 1 mm during a ride. Any suggestions?
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Old 03-27-08, 06:26 AM   #2
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Use a soda or beer can and make a shim
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Old 03-27-08, 09:06 AM   #3
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Is your bike French?
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Old 03-27-08, 11:16 AM   #4
coasting 
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Is your bike French?
No it isn't. It's british I think.
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Old 03-27-08, 11:28 AM   #5
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A British seat tube has got to be 28.6mm or 1 1/8 inch. A French frame would have a 28mm metric seat tube. If it's not French, I don't know what to tell you. The Campagnolo FD on my PX10 does the same thing, but I have an undersized tube to blame.
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Old 03-27-08, 11:48 AM   #6
coasting 
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Originally Posted by Dirtdrop View Post
A British seat tube has got to be 28.6mm or 1 1/8 inch. A French frame would have a 28mm metric seat tube. If it's not French, I don't know what to tell you. The Campagnolo FD on my PX10 does the same thing, but I have an undersized tube to blame.
Thats what I thought! Very odd. Did you make a shim from a coke can? I checked with a couple of shops and they didn't sell any shims. A shim did come with the FD but just to get from 31 mm to 28.6
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