I have put about 200 miles on my K70 3.25x19 and and 3.50x19 and love 'em. Much more precise steering, quicker handling, and better stability than the Avons They have it all, even done a minimal amount of dirt work in which they were very nice.
Thank´s for the link, GlenF. Very helpfull and a good read!Finally a mechanic sucesfully managed to get the AM26s on my whels without doing anything wrong. Amazingly three attempts were necessary: first time sidestroke, second time air loss. I noticed that climbing up the Grossglockner! http://www.grossglockner.at/en/Now there on, and are a major dissapointment. To my surprise I´ve got a high-speed wobble now! Indeed with the ancient stock profile not very swift leastwise rock steady straight, Precious now tends to wobble when sidewinds hit or the surface get´s uneven. She even takes this wobble along when getting inclined! I suspect I found a reason, if not the reason for the C5´s lack of stability over 100 km/h. I may repeat, since the BT45 is available there is really no reason to take another tire for the C5.Otherwise these modern AVONs are quite well, adhesion seem to be more than enough and due to the round profile of the rear tire she feels better when heavily inclined. That´s the only outstanding advantage over the stocks, though.The wobble gets much worse when the front´tire´s pressure is increased. I tested 1,3 bar to 2,0 bar in the front and it gets better with less air. I even tried 1,0 bar and the straight running ability gains, but the cornering stability suffers.At the end I cannot recommend the Avon AM26, for I don´t see a desirable improvement. I´m not sure if I like to keep them. RegardsMaturin
I know people have found very low tire pressures to work for them on their C5's, but on my iron barrel, anything much less than 26-28 psi makes my bike feel unstable. I like 28-30psi front - not sure what that translates to in bars. In any case, I can take my hands off the handlebars at 65mph and the bike is rock steady. I personally don't have a problem with the stock Speedmaster/Safety Mileage combo other than they are more expensive than K70's or similar options.
It´s even more stunning, as the mule was going rock steady straight on with the worn down AVONs AM6/7, and felt pretty transformed after the tire change wobbling with brand new AM26ers!As I said before the effect can be reduced by lowering tire presure on the front. Actually I blame the front for the wobble, as tire pressure on the rear has no effect on it and otherwise all instability seems to come from the front.