shane...the 28, 24 was what i ran last night...they were just as fast as pit 20, 24...when running stock you can have too soft of a tire....that is why i tryed the stiffer....also, sorex 20 wares out in a couple weeks.....not as durable as pit 20..in my opinon....also, the losi has so muck tracktion, it will bog the car down in the corner....that is why...