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On a triple chainset you just leave the middle chainring in place to go 1 x 10 or 11 and all is well. But on a double chainset are you compromised as neither the outer or inner position is quite right for the chainline? Or is one of those positions good enough? Which one?
middle on triple. outer on double. I have both setups 1x10 and neither are giving any trouble
outer, has the right BCD.
Depends entirely on which double it is... a lot of the SRAM ones are 80/120, and XTR Race is 88 on both rings.
I used the outer of an XTR Race. Wasn't ideal - the chainline was slightly further out than the middle ring position, but was absolutely fine in use, didn't rub any more on a guide or anything like that.
Thanks creamegg. So the single would fit the outer and then that doesn't bias the chainline too far onto the smaller cogs of the cassette?
not in my experience on XT and SLX cranks. May be different for other cranks though
As above, also fine on XTR Race.
So any Shimano will be fine, basically!
I've been looking into this too.
Also check the tooth count as it looks like the tabs on an SLX double will foul with 32 tooth in the outer position.
One option for chainline is to move one of the BB spacers from drive to non drive side to move the ring back to 'middle' for better chainline into the large end of the cassette. This will slightly offset the cranks to the left - check the arms don't foul the frame.
Aye, good one.