On my old Klein hardtail I had Middleburn XC Duo crankset, 8 speed cassette and matching chain. It worked perfectly for years.
Transfered the same compoments to my Cove Handjob and got terrible chain suck. I confirmed the BB length with Middleburn, 68/113, Sq Taper.
When I checked, the rivets on the inside of the outer chainring seemed to catch on the chain when it was on the inner ring. So I demmelled them flat! Chain suck all reduced, but when the chain is on the small sprocket at ther back, the outside of the chain rubs horrendously on the inside of the larger front chainring.
So I bought a longer BB, 118. Made little/no difference. I tried moving the whole crankset by hand out along the taper to find out how long the BB axle would need to be – too far to be realistic. I dont think the front mech (XT) would be able to reach that far.
Am I missing something, where am I going wrong? Any ideas welcome.
If its something simple you can call me a div, bring it on…