i had asked about this in the sport bike track gear thread and they made it seem like the pure was being replaced.
I'm sure Tommy will post something definitive.
OP I'm running The Pirelli SP's and they are so awesome! I'll run through a few sets of these and then make the transition To The SC race compounds. For a street/track tire I don't think there's better grip Out there. Not only insane grip, but softer compound which helps keep the suspension smooth and settled! Recommended to me by none other then Anthony of BAUCE Racing. Such a sweet tire! I'll be able advance my pace with this into expert I'm sure... They are that awesome! Just my two cents...
If you have the extra $ to get the SP's over pures or the other options, that's the way to go IMO. Then the transition from them to the race compounds is hassle free since you're already used to the profile and carcass feel, etc. Just a click or so more rear compression for the added traction when you goto the race compounds and the bike will be great in many cases!
The problem you WILL have is that they are super soft carcass and without warmers the cold pressures for them is too low to really have the bike even feel remotely comfortable for those warmup laps. 31/26 is what I favored on them, and that's like 28 and 22 or so cold, maybe even less as your pace increases.
Riding around like this makes the bars steer with the bike like you've got a flat front tire until they warm up. I hated them cold and the few times I ran without warmers on them I was not happy at all.
And warmers pay for themselves by giving you less cold tearing and better tire wear as well.
All this talk makes me want to trade my bt003rs's for a soft carcass as well.
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The BT-003 isn't very hard, it's the front tire sidewalls and feeling that everyone seems to complain about. The R10's are a much better tire for sure, but even that front tire is VERY picky and the compound sucks and isn't nearly soft enough. You can do like 3+ rears to a front no problem, the front tire was so hard, but still gripped like hell.