ud be lucky first of all if u can find a garage to do it, and as paul said on sva's your allowed 10% under anywho n speeding cameras normally have say 70 + 10% + 2 = 79
taking that into account you could fit 195/40/16s and only be +0.3% meaning ud be doing 50.8 when the speedo says 60 or 195/45/16s and only be -3.1% meaning ud be doing 61.9 when the speedo reads 60 at worst if u go to 205/45/16 it 4.7% meaning 62.8mph when it reads 60 not exactly jaw dropping difference is it