Update on tires and slideing out
I was going to post an update on a post I did some time back about the problems I was having with D208's on my CBR 600 but I can not find the thread. I replaced the D208's with M1 sporttech's, last week. I now have about 600 miles on the new tires, it does not feel like the same bike, the M1's are so much better that I have a whole new outlook on that bike. To be fair to the D208's I found that I had a warped disk which played a role in the lockups I was experiancing, I replaced the disks before changeing the tires, and found a moderate reduction in the tendensy of the front to tuck, but it still would, and the rear would still take a walk when it got half a mind. While at the Barber track I got the chance to talk it over with some of Reg Pridmore's staff, they also use the D208's on thier track bikes, (F4's) but they use the GP compund and mine were ZR. I found that I was running about 5 pounds more air pressure than they do on the track. A racer who was taking reg's course that weekend told me that the D208 is not a good choice for general street riding as it needs to hit about 130 F to get sticky, but said he likes them on the track, he also uses tire warmers. So basicly my problems were due to a warped disk, running a tire below the heat level at which it performs well (ie street use of a track day tire), and a little bit of overinflation. FYI, the CLASS school runs 30 psi cold in thier D208's and says that they find them to be up around the 35-36 psi mark after a session, from that and what I found I would run 30-32 on the street, if I ever ran the D208's on the street again. Since going to the M1's I am unable to cause a lockup of the front tire even on damp pavement, and only once has the rear slipped at all, that was in a sandy mud puddle while making a 90 degree turn at 20 mph.