Originally Posted by
Bill Kapaun
I'd probably opt for a M-31X level.
9 speed will be just a bit narrower and more prone to rub on the wider 7 speed chain.
Even a Tourney level will work fine when used in "conventional" configurations.
This is my 22-32-36 with a Tourney on my 9 speed Globe. You can see the gawdawful gap.
It does need a bit of help going to the largest ring, but considering the largest ring should have 6-8 more teeth.....
Holy cannoli! That's quite a gap!
Why does it need to be installed so high? (That's not me being critical btw! Just curious as I've never seen any installed that high before
)
I'm not
too worried about chain rub - if it turns out to be a problem, I'm pretty sure you can put 9-speed chains on a 7-speed set anyway. Y'know. Improvise! Though, I'll double-check you can actually do that first. If it comes to it.
I'll look in the M31xx. Am I right in thinking that's in the alive-alive-o range?