issue finding derailleur with 29mm downtube clamp
05-03-09, 01:37 PM
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issue finding derailleur with 29mm downtube clamp
Hi,
I have a trek 370 road series cro-moly frame which has a 29mm downtube. unfortunately I am having trouble finding a front derailleur with a clamp that size. Is there a way that I can have a larger size (most likely a 32mm) clamp fit properly? Thanks
I have a trek 370 road series cro-moly frame which has a 29mm downtube. unfortunately I am having trouble finding a front derailleur with a clamp that size. Is there a way that I can have a larger size (most likely a 32mm) clamp fit properly? Thanks
05-03-09, 01:50 PM
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The front derailleur clamps onto the seattube of a frame.
28.6mm ones aren't that uncommon, but you can make a 31.8mm one fit by shimming it with a section of 1-1/4" diameter PVC pipe that has a wall thickness of about 1/16".
28.6mm ones aren't that uncommon, but you can make a 31.8mm one fit by shimming it with a section of 1-1/4" diameter PVC pipe that has a wall thickness of about 1/16".
05-03-09, 01:56 PM
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Could you try filing or sanding a 28.6 to fit?
05-03-09, 02:23 PM
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I think the current Shimano 31.8 come with a shim for 28.6.
05-03-09, 02:28 PM
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You can find a 28.6 collar on eBay or other.
I've just bought this one: https://www.xxcycle.com/collier-derai...nt-286,,en.php
Works perfectly and is quite nice.
I've just bought this one: https://www.xxcycle.com/collier-derai...nt-286,,en.php
Works perfectly and is quite nice.
05-03-09, 02:29 PM
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okay, well i guess that solves that issue
i'm trying to find a campy front derailleur so I guess I need to find a shim or just a replacement clamp since it doesnt look like the campy derailleurs I'm finding on ebay have a 28.6 clamp
thanks everyone
i'm trying to find a campy front derailleur so I guess I need to find a shim or just a replacement clamp since it doesnt look like the campy derailleurs I'm finding on ebay have a 28.6 clamp
thanks everyone
05-03-09, 08:13 PM
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I just picked-up a brand-new 28.6mm Campagnolo Record, from the late 1970's, on eBay for $10. I found this as I have a good old-fashioned vintage bicycle that requires the 28.6mm. They are getting scarce. But I also recently bought a Shimano FD - and it came with clamps for all the sizes.
In that Shimano (not always) sends these along with the purchase, your LBS may have a bucket-full of these clamps. Make a few phone calls.
In that Shimano (not always) sends these along with the purchase, your LBS may have a bucket-full of these clamps. Make a few phone calls.
