The problem with the TCS-spec 60D super grips is the flexible sidewall. That's why all the chatter about side wall gluing. Finally, Tamiya is running out of the last big warehouse order of super grips, and Fred is listening to all the M-chassis racers wanting a better tire. Probably helps that their experience changing F-1 tires to Pits worked out really well. The TC drivers aren't too enamored with B3's either, most using Sorex except for TCS. So, there may be lots of Tamiya racing tire changes coming soon...