Just did a ride day at Eastern Creek last Sunday. A cool day which maxed out at 19 degrees C and track temperature well down. It rained briefly but heavily first thing and then cleared enough for the track to be 95% dry by 11.00am.
I used a 120/70 Diablo Corsa front and a 170/60 Evo SC2 (medium compound) rear - John M also has one of these which were a special tyre brought in for Buell X1 Lightnings for racing in the now defunct ARRC Naked Lights series and they ARE sticky. I also used Bandit tyre warmers and this time out had a tyre temp probe (ex-Klaffi Honda WSBK team, thanks guys).
I sat out the second session after almost binning it in the first - the back was absolutely f'in 'orrid in the wet! So the old girl got over an hour and a half on the race stands with warmers. The rider got three coffees and half a pack of Arrowroot bikkies!
Pre-session temps/pressures were: F 82/34, R 84/32. After a good fang and average 1:47 lap times (yeah, yeah I know, Criville's lap record is a 1:30, but there were still a few damp patches and lots of muggles) the temps were: F 86/36, R 93/38. Just thought it was interesting and I've no real idea if these are normal in "proper racing" but it's interesting that the back increased pressure much more than the front, yet looks like it had hardly done any work - no cold tearing, just a smooth consistent roughness right to the edges. Anyone know why? I ask because I am not a rear end hero, sideways action is not my domain.