I have recently bought a 2013 nukeproof mega tr frame and mounted my shimano 9x rear mech on to it. However now i cant get get it to shift to the largest sprocket even with the low limit screw maxed out any ideas.
Thanks
Alex

Bent mech hanger or bent mech cage.

Hanger sounds a likely cause.
Release the cable and move the mech by hand and see what you can do.

The frame came with an extension to the mech hanger attached i think as a direct mount adapter. I took this off and it works fine. Not my brightest moment but thanks for the advice.