I got my HP4 in March ( of which I love) and have now done 1500 miles on it. As you will probably know the bike comes with Pirelli Super Corsa sp 200/55 zr 17 back and 120/70 zr 17 front. In the time I`ve had the bike I don't seem to have 100% confidence in the tyres, Is it just me???. My...