Thread: 4mm vs. 5mm SIS Derailleur Casing
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Old 01-12-07 | 07:14 PM
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sam83
On Two Wheels
 
Joined: Mar 2005
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From: Middle Tennessee

Bikes: Moots Vamoots, Bianchi Volpe, 2 Salsa Casserolls (fixed & Triple), 2011 Salsa Chili Con Crosso, 1983 Schwinn Supersport, Schwinn Mesa MTB

4mm vs. 5mm SIS Derailleur Casing
So our bikes range from 7-spd to 10-spd Shimano. While shopping for derailleur casing, I see where I can get either 4mm or 5mm.

What's the difference (besides the obvious)?
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