I would try the grps if you racing on track the b soft , as stated above for 44$ a set cant go wrong .
You can check out suprasales on ebay also , $30 a set treaded tires and rims look pretty cool . dunno how good the tires are but for price not bad for practice . tires will become you biggest expense racing on the track .
I have the suprasales treaded. Haven't tried them out yet. They are really tall in diameter compared to the Sweeps and Pmt's. They don't seem like they have much support in the middle of the tires. I also have a set of the Kyosho stock rtr tires that I tried at first, but I didn't care for them.
Traxxas - XO1 GT8 XL2, 2200kv, Hitec 985mg + Rally 2400kv + Slash 4x4 + Slayer Pro
Losi - SCTE Bump, Hitec 985mg, Tekin Rx8, Tenshock sc411 4600kv + 8 Te 7955tg,Tekin Rx8 2000kv
Associated - RC8.2eFT Hitec 7955tg, Tekin Rx8 2050kv + T4.1FT Hitec 965mg, MMP 3900kv
Ofna - DM1 E MMM 2200kv