I have spent considerable time researching tires, sizes and talking to people. Everyone has their favorites but the one thing that was always consistent was nobody ever bad mouthed the Avon, Super Venoms. Well I finally removed a few fish hooks from my pockets and sprung for a set AM18's 100/90 19 front and rear for my MARK III. Wow, what a difference.
I must also comment that I went deep when I did this and had the wheels tuned, trued and the offsets corrected.
FYI, my previous tires were mismatched, a Dunlop K81 on the front and a Bridgstone Spitfire 110/90 19 on the rear. I never liked this combo.
Now before everyone goes off on me and says it is not a fair comparison, let me tell you about my other two Nortons. My 72 has a Metzler Me33 100/90 18 on the front and a ME55A 120/90 18 on the rear. My 71 has matching Dunlop K-81's.
By far my preference are the Avons. It doesn't make the other ones bad, it just feels like the Avons are 'STUCK' to the road more and with good feel.
Ride hard, or stay home.