Fazer 600 needs a new rear. Currently wearing BT57 F&R. They don't make BT57 any more, so I am being offered BT010 and BT020. I have received conflicting information from two tyre suppliers/fitters: one guy says should go for a BT020 as this is harder and you shouldn't run a softer tyre at the back (relative to that at the front). The other guy says get a BT010. Who's right? Does it really make any difference? I believe that the BT010 is a softer, grippier tyre but will tend to wear quicker than the BT020. (Just had a look on the Bridgestone site and they recommned the 010 for the Fazer) Appreciate and tips, ta.