Hello, I want to give my friend new tyres because they are just too old. We bought the motorcycle BJ. 1990 last year in a rather bad condition. From maintenance wa da nothing to see. But no matter; in any case I would like to give him new tyres. In the show stands Dunlop 110/80 V 17 k655f 140/80 V 17 K655 And 110/80V17 V270 ME33, 110/80 VB17V250 ME35 What does this V mean? Do you have to drive the same brand in front and back? Can I drive a wider tire in the rear? What p Does the gsx eat? Which tyre brand is good? And there is still another question in the lower part of the bill: power rise. d. carburettor cover oh. gas slide-on. What does that mean?