Stay away from continental ultra-sports, and don't go with the gatorskins either that's a $40 tire that's not any thicker in tread than the cheaper $15 contis I mentioned. Gatorskins are good cause of their flat protection, why people recommend skidding on a tire that expensive beats me! SOMA Everwear if you're really stuck on skidding, biketiresdirect.com has them for $31 each.