How do you block off the big ring?

by Raleigh   January 18, 2012  

Well, the question's in the title.

How can you stop the big ring from being shifted to, I really need to know.

If you use the derailleur limiters, will you have to retension the cables?

Thanks Forumers.

4 user comments

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The limit screws do not affect cable tension at all. If you only want to use the inner rings, you would just fully screw in the outer limit screw (normally marked H, sometimes located on the inside) to prevent the mech shifting up to the biggest ring position.

The cable tension should still be fine for the inner and middle shifts, but you will meet some resistance if you try to go further. If you are struggling to shift into the middle ring having done this, you would need to back it out again slightly.

I used my mountain bike as a 2x9 bike by removing the biggest ring and just turning the outer limit screw in sufficiently. It should work fine.

posted by pixelmix [25 posts]
18th January 2012 - 21:24


Its for junior gears, so instead of a double I would just have a single, 34t (compact) chainring.

Not ideal, but otherwise I'll need a 42t chainring before Saturday 12am with 110mm BCD and 5 arms.

Gear restrictions are 6.92 m, or 44 x 13

Sir Velo

Raleigh's picture

posted by Raleigh [1734 posts]
18th January 2012 - 21:27


if you just want to use the inner ring and the limit screws don't go in far enough you could just shift into big, undo the cable and the mech will fall back to the inner position. tighten the cable clamp up again and you won't be able to shift even if you want to.

Dave Atkinson's picture

posted by Dave Atkinson [7857 posts]
18th January 2012 - 22:05


whatever you do, don't try and just lock off the mech in the smaller chainring without slackening the cable. It's easy to wreck the mechanism of a sti type lever by trying to shift it into a position that the cable travel won't allow.

I found this out the hard way when using a triple lever on a double setup. The bike is now running as a 1x9...

joemmo's picture

posted by joemmo [1113 posts]
19th January 2012 - 13:26