Well, M/T reccomends a tube. I don't like using tubes and these tires have been on the car, tubeless, since 2001. Rears only. I don' t really find myself having to air up to rec. pressure very often. I have used other soft compound tires & while some others work like a racing slick they left alot to be desired in their lifespan and road stability. I built my cobra with the primary intent of dragracing it. I'm not sure M/T S-Pros are the best bet for high speed cornering but for pure street acceleration/dragstrip action and general highway driving they seem to be the best comprimise. I am the biggest limiting factor to my cars cornering capabilities, not my tires....cluck-cluck
