Bike Forums - View Single Post - 34.8 derailleur on 26.x seat tube

11-20-08 | 12:00 AM

#3

Jeff Wills

Insane Bicycle Mechanic

Joined: Mar 2008

Posts: 10,142

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From: other Vancouver

Quote:

Originally Posted by dsmyers

Hi,
I'd like to mount a 34.8, clamp-on derailleur (SRAM Rival) on an old steel bike with a traditionally-sized seat tube [EDIT: 28.x? Whatever it is...]. Is this going to work if I shim it, or will the derailleur position somehow be off with respect to the chainrings. (I'd expect this to work but just wanted to make sure before I buy something.)

Thanks,
Daniel

In other words, you're wanting to mount a derailleur with a 1 3/8" clamp on a 1 1/8" diameter seat tube. I've made shims out of PVC pipe- you'll want a piece about 2 inches long to make sure the derailleur is stable. They've worked fine for thousands of miles.

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