Slowridr

It's a m670 front derailleur. Shimano website says it fits a 28.6 frame with adaptor. Not sure if adapter was suppose to come with it as I bought it on ebay.

Can't find the adapter locally on Canada. Only a few US and UK sites have it. Any other ideas how I can get the derailleur on?

Ronsonic 

The thing you are looking for is a "Front Derailleur Clamp Shim." They do often ship with the FD.

Here's a example: https://www.nashbar.com/shimano-ulte...198030/p578001

CliffordK

You will need a shim. If it is listed, it should come with the derailleur. Was it shipped to you new, used, new pull, no box, etc?

I'm seeing several from China.

https://www.ebay.com/itm/Bike-Bicycl...m/163664088013

That one even lists Canadian dollars, I think. The Chinese are pretty good at shipping at least something.

CliffordK

Note, that one is 31.8, but same general idea.

dsbrantjr

The Shimano FDs I have gotten recently are sized for 34.9 and come with adapters for 31.8 and 28.6 so you will need a shim if they did not come with it.

3Roch

I just make a sleeve out of 6061 T6 in the lathe with the appropriate OD and ID then cut it in half to make 2 semicircular shims. Works fine. ( if you wanted to you could drill some small holes in it to covert it to drillium alloy)

Lemond1985

I tried a variety of shims recently, trying to get a 34.9 FD to fit a 28.6 seat tube. Maybe I'm an awful fabricator, but I had the worst time with trying to get the clamp secured with various shims made of inner tube, electrical tape, and finally sections of aluminum handlebar.

What would happen is the clamp would clamp down unevenly while tightening the clamp bolt. Which would cause the FD to "lean" a bit left, right, forward or back. This affected its operation badly, and performance was pathetic. It was also difficult to really clamp the FD down securely with a shim, there was always some movement if you grabbed the FD and moved it back and forth.

If I made a very wide shim, it looked awful, you could plainly see it sticking out. While narrow shims could be essentially invisible, I could not clamp the FD on straight to save my life. I finally stripped the allen bolt, and after much frustration, finally bought a FD with the right size clamp.

So anyway, I had a nightmare of a time with this, and if I had it to do over I would just buy the correct size FD from the start.

AeroGut

If there’s a bike shop near you, you might try asking them if they have one around. Since every FD they get comes with a set of shims, they often have a bunch of unused ones.

DrIsotope

The specific part you're looking for is the:

Shimano FD band-clamp adapter, SM-AD17-S 34.9-28.6mm

I cannot find one on Amazon.ca or any sites that are specifically Canadian, but they are widely available online, and honestly, most any bike shop should have one.

Probably around 10 bucks.

dsbrantjr

The nice thing about the correct Shimano shim is that it cradles snugly into the derailleur clamp and does not move around separately, eliminating many of the problems encountered by Lemond1985.

Jeff Wills

I made a front derailleur shim out of a 1 1/2" length of PVC pipe. It worked fine for years. I painted it black to match the frame and no one ever noticed it.

Soody

a little bit of cheeky coke can poking out looks cool