Bought a SLX groupset to put on my 20 year old Kona hardtail and am having problems setting up the front mech. The BB is 68mm. SLX triple mech and chainset. Bar shifter is set to 3sp mode.
The chain happily sits on the small ring but when I push the shifter once it moves onto and past the middle ring and tries to get on the big ring. If I shift again then it goes over the big ring and off.
Clearly I can tighten the limiting screw to stop it going off but all that happens then is that it constrains the shifter from properly clicking into the top position.
I've also slackened the cable to the extent that it's well floppy when in the small ring. But even then when I shift up it shifts too far.
To my novice eye, it seems almost as if the chainset is sitting too close to the seat tube, ie further left than the mech expects it to be. The mech is essentially pushing too far right.
Which would maybe suggest that I need more spacers on the right hand side of the BB. I put one on the left and two on the right, like wot it said on the awful instructions on the SHimano site.