Mounting front mech - is this a bodge?

Jeremy Collins said:

Hi all,

I'm reviving an old MTB so that I've got a decent spare bike, but
without spending too much money.

So I've got a decent unused Deore LX front mech which is the
correct size for the chainset, but the mounting bracket is a little
bit too big for the frame.

Is it a horrible crime to use it anyway, and fill the gap with
something?

Yes, it is a horrible crime: you'll probably share a cell with Shimano.

You might be able to use one of their adapters. Or use something solid,
like a piece of PVC tubing of the correct thickness

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

Jeremy Collins said:

Hi all,

I'm reviving an old MTB so that I've got a decent spare bike, but
without spending too much money.

So I've got a decent unused Deore LX front mech which is the
correct size for the chainset, but the mounting bracket is a little
bit too big for the frame.

Is it a horrible crime to use it anyway, and fill the gap with
something?

If not, can anyone tell me what the "something" might be? I assume
a light-bracket style rubber shim wouldn't be up to the job.

Some solid(ish) shim would be fine. You might struggle to get a metal on
round the seatpost, but one of our bikes has a loose carbon fibre collar
as a shim.

James
--
If I have seen further than others, it is
by treading on the toes of giants.
http://www.ne.jp/asahi/julesandjames/home/

in message <[email hidden]>, Jeremy Collins

(') said:

Hi all,

I'm reviving an old MTB so that I've got a decent spare bike, but
without spending too much money.

So I've got a decent unused Deore LX front mech which is the
correct size for the chainset, but the mounting bracket is a little
bit too big for the frame.

Is it a horrible crime to use it anyway, and fill the gap with
something?

If not, can anyone tell me what the "something" might be? I assume
a light-bracket style rubber shim wouldn't be up to the job.

Standard Aluminium Beer Can shim, as discussed at length in Zen and the
Art of Motorcycle Maintenance, will do it. Depending on the amount you
need to shim out, you might need more than one layer. For best results,
of course, carefully abrade all the paint off the outer side and stamp
it 'BMW'.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

The trouble with Simon is that he only opens his mouth to change feet.
;; of me, by a 'friend'

Jeremy Collins said:

Hi all,

I'm reviving an old MTB so that I've got a decent spare bike, but
without spending too much money.

So I've got a decent unused Deore LX front mech which is the
correct size for the chainset, but the mounting bracket is a little
bit too big for the frame.

Is it a horrible crime to use it anyway, and fill the gap with
something?

If not, can anyone tell me what the "something" might be? I assume
a light-bracket style rubber shim wouldn't be up to the job.

http://www.sjscycles.com/store/vIndex.htm?cat274.htm - front mech shims

~PB

Simon Brooke said:

in message <[email hidden]>, Jeremy Collins
([email hidden]'😉 wrote:

Quoted message said:

Quoted message said:

Is it a horrible crime to use it anyway, and fill the gap with
something?

Standard Aluminium Beer Can shim, as discussed at length in Zen and the
Art of Motorcycle Maintenance, will do it.

I like it! Before your post I had visions of scrabbling around the
house for a bit of PVC tubing, now all I have to do is drink a beer!

Cheers to everyone for the replies.

--
jc

Remove the -not from email

Jeremy Collins said:

Simon Brooke said:

in message <[email hidden]>, Jeremy Collins
([email hidden]'😉 wrote:

Quoted message said:

Quoted message said:

Is it a horrible crime to use it anyway, and fill the gap with
something?

Standard Aluminium Beer Can shim, as discussed at length in Zen and the
Art of Motorcycle Maintenance, will do it.

I like it! Before your post I had visions of scrabbling around the
house for a bit of PVC tubing, now all I have to do is drink a beer!

Cheers to everyone for the replies.

It is even better than you think: a typical beercan is about 0.1 mm
thick. You'll need 16 shims to bridge one size up ! Better get a sixpack
with bandaids to go 😉
--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl