Originally Posted by MrCjolsen
It should never fall off if it's properly adjusted and any frame should work with a triple.
I have a Surly Crosscheck and it works fine with a triple. I'm using a Tiagra front derailleur with a 48-36-26 crankset.
Front derailleurs are spec'd to work with specific ranges of crankset sizes. And they are very touchy to adjust. Not just the derailleur but also the height and angle. But a bike shop should know this, so I think that you need to try a third shop.
The problem with the crosscheck frame shows up with smaller ratio 44/32/22 cranks
see my post which sank without trace
http://www.bikeforums.net/showthread...ght=crosscheck
I should have the xt der by monday( have a shop/there you go third shop
) and will let you know if this works otherwise the above option of the 48-36-26 might be the only solution as it lifts the der mech away from the chainstay. The problem with this is you lose the very low gearing you are chasing.
You could also try the sram dual drive hub system with compact on the front which would give really low gearing ( it would be a shame to give up a crosscheck
)