[jzt]

I have a 22-32-bashguard setup currently. I go downhill a lot, so I want a bigger middle chainring for higher speed. I dont' want a big ring because I want to keep the bashguard (accomodates up to 38T).

the question is: what is the largest recommended chainring that I can pair with my 22T? i'm thinking of 38T but could my front Deore derailleur handle such a big shift? I want to keep the 22T because I need it to get up the steep trails.

 

[Homebrew]

14T is probably the biggest jump that you want to take. So that makes it 36T. You could try the 38T but I think you might have some trouble dropping the chain over the 22T. If you went up to a 24T, you could go with the 38T.

 

[Karkus]

I ran a 16t jump ( 20-36) for years without any trouble, so based on that, I'd say your 22-38 will probably work. Note that I was using non-indexed shifters - I don't know if that makes it easier or not.
I just got new (4 bolt) cranks which won't take a 20, so I may try 22-38 soon. If you try it, please post back here to let us know how well it works.

 

[dstepper]

20 tooth 4 arm

http://www.boonerings.com/cr/orderformchainring.html

It is slightly squared to fit 4 bolt pattern.

Any one here using one?

 

[bear]

Depends a bit on the front-d cage design, how much range it has.

I've a current XT front-d, and running 22-34, and it's fine. 22-36 would probably work too, based upon the clearance that I can see, but more than that could be a problem.

 

[MikeDee]

http://www.boonerings.com/cr/orderformchainring.html

It is slightly squared to fit 4 bolt pattern.

Any one here using one?

What do you mean by squared (i.e. the ring ain't round)?

 

[logbiter]

I agree, especially for an indexed shifter. it'll also depend on what derailleur you're running.
You can give it a shot, but it'll probably be finicky.
I've run 24-36-48 with a mega9 XT, but it was a bit finicky, especially going up to the 48.
It works much better with an older 8spd XT/XTR or 7/8spd suntour.

yes, I'm loath to give up my 8spd ways and standard BCD cranks.

14T is probably the biggest jump that you want to take. So that makes it 36T. You could try the 38T but I think you might have some trouble dropping the chain over the 22T. If you went up to a 24T, you could go with the 38T.

 

[dstepper]

Correct

To fit the bolt pattern, the 4 bolt 20 tooth ring is not perfectly round.

I what to see one?

I e-mailed Boone a month ago asking them to e-mail me a picture...they never responded. Boone makes quality stuff, but they are a small company.