34.9 too big, 31.8 too small... doh...

My_Teenage_Self · Jul 28, 2014

Gotta love these quirks that older bikes have...

So I'm trying to get this done, but the 34.9 front mech I had was too big, so I buy a 31.8, and that's too small! got the calipers out, and I'm looking at around 33.5.

Would a band on mech work? Do they come in different sizes?

Anyone got an m735 (or want)

:facepalm: ?

frank.youngman · Jul 28, 2014

Re:

On two of the bikes I had powder coated the paint was so thick that initially a 31.8mm front mech would not fit.Because the jaws of the mech could not close,the usual bolt through could not reach the threads and secure the mech around the frame tube.My solution was to get an oversize bolt and use that to force the mech into the paint and once that was achieved I replaced the original short bolt.

Other than that a banded type has a wider range of adjustment.

syncrosfan · Jul 28, 2014

Why not use a 34.9 with a shim?

Silvergoat · Jul 28, 2014

Re:

26.8mm or 28.6mm is even quirkier :facepalm:

My_Teenage_Self · Jul 28, 2014

syncrosfan":2kkny2ei said:
Why not use a 34.9 with a shim?

Because I no longer have one!

I'll be buying a mech either way, and just wondered if band-on was the answer.

ishaw · Jul 28, 2014

Can't remember the details, but didn't the band's on band on mechs come in specific sizes like the standard clamps?

My_Teenage_Self · Jul 28, 2014

Dunno... never used them before, but I just googled the frame, and it did indeed have a pic of a 735 band on...

FluffyChicken · Jul 28, 2014

Re:

Yes they where different sizes. For the three imperial tube dimensions we use.

Do you have a picture of where you are putting it and what bike it is.
Chance it's paint (most common) or not a round tube anymore (often seen putting top-swing mechs onto old bikes with Ovalised or Bulged tube joints

My_Teenage_Self · Jul 28, 2014

Unpainted carbon tube - almost perfectly round tube!

andyz · Jul 28, 2014

Re:

I think I may have a band-on M735 front mech, 34.9mm.

I don't know if it would tighten down to 33.5mm though.

34.9 too big, 31.8 too small... doh...

My_Teenage_Self

frank.youngman

Retro Guru

syncrosfan

Senior Retro Guru

Silvergoat

Senior Retro Guru

My_Teenage_Self

ishaw

My_Teenage_Self

FluffyChicken

My_Teenage_Self

andyz

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