Hi all ,I've put this post in technical but thought it might get seen more here,mods feel free to delete if you cant post in two sections ,I have a thorn xtc with a triple chainset with an 44 tooth outer ring,but this is very worn out now so I have got my self a shimano xt chainset with a 48 tooth outer ring(triple),but the front Derailleur is now to low and hits the ring,so I,m thinking I just loosen the Derailleur clamp and move it up abit and then ajust accordingly so it clears the outer ring,anything I need to know,i wont damage the frame clamping the Derailleur higher up the tubing will I?,its been in its present position for 8 years(its a shimano xt Derailleur which has been faultless and would like not have to buy another either) thank you for any help mike