Re: BCD and chainring compatibility

Simon Brooke said:

in message <[email hidden]>, Taka <Taka> (''😉

Quoted message said:

I have never understood why "road" rings don't work on montainbikes?

Often because of interference between the larger chainrings and the
chainstay - there physically isn't room on many mountain bikes. If there
is room, then a 'road' chainset will fit perfectly well (you're right
than in general it's not easy to put 'road' rings on 'MTB' chainsets
because of bolt pattern differences, but that's at least partly
marketing-driven rather than for technical reasons). Someone in our club
time-trials on the road an old mountain bike frame with tribars on, and
does very well.

Thanks Simon,

I'm thinking of putting a compact chainset from FSA onto my MTB frame.
Hopefully it will work!

Good luck in your time trial on Tuesday!

Thanks!
Taka

in message <[email hidden]>, Taka <Taka> (''😉

Quoted message said:

Simon Brooke said:

in message <[email hidden]>, Taka <Taka>

('') said:

I have never understood why "road" rings don't work on montainbikes?

Often because of interference between the larger chainrings and the
chainstay - there physically isn't room on many mountain bikes. If
there is room, then a 'road' chainset will fit perfectly well (you're
right than in general it's not easy to put 'road' rings on 'MTB'
chainsets because of bolt pattern differences, but that's at least
partly marketing-driven rather than for technical reasons). Someone in
our club time-trials on the road an old mountain bike frame with
tribars on, and does very well.

Thanks Simon,

I'm thinking of putting a compact chainset from FSA onto my MTB frame.
Hopefully it will work!

Yup. There should not be any problem with a 'compact' chainset, where the
big ring is no bigger than some MTB chainsets. Mind you you can achieve
a similar result simply by taking the granny ring off an MTB chainset -
the 'Q' measurement will be marginally greater, but for those of us who
are not serious athletes this probably doesn't matter that much.

Quoted message said:

Good luck in your time trial on Tuesday!

Hah! We'll see...

I /should/ be able to do it, but I haven't yet.

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

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Simon Brooke said:

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

Quoted message said:

Quoted message said:

I'm thinking of putting a compact chainset from FSA onto my MTB
frame. Hopefully it will work!

Yup. There should not be any problem with a 'compact' chainset, where
the big ring is no bigger than some MTB chainsets. Mind you you can
achieve a similar result simply by taking the granny ring off an MTB
chainset - the 'Q' measurement will be marginally greater, but for
those of us who are not serious athletes this probably doesn't matter
that much.

The 'Q' wossname /might/ matter if the chainstays are kinked outwards to
give clearance for BFF-O tyres, though. There's not a huge amount of space
'twixt crank-end and chainstays on my run-of-the-mill Trek, anyway.

--
Dave Larrington - <http://www.legslarry.beerdrinkers.co.uk/>
Apparently Guy has now got a Brompton. I'd never have guessed.