www.summitracing.com order one of there catalogs or search their site.
but if you want drag radials(street legal) then go to american tires/discount tires or their site www.tires.com
im using some 225/50/15 bfg drag radials, awesome traction, i can't even spin 1st from a roll if the tires are heated up, of course i can spin em a bit from a stop but i can slip the clutch a bit to make it work =)
well im pushing a decent amount of power in a 2400lb car and i have no traction issues, and the tires are brand new(they get stickier once they break in), so maybe the smaller ones just don't grip as good...