I recently purchased a set of these tires for my lively Turbo charged Miata to try out at a local AutoCross event. and I am blown away, for the price i purchased them at with simple tires free shipping: These tires are almost a race compound... and there is little to no Sidewall flex! (mind blown) The only tire that even comes close to the performance of this compound would be a Bridgestone RE-71R in the size for my car, and at the time of purchase these delta's were almost half the price of the Bridgestones! to make matters even better the ware so far is looking like it will outlast the RE-71r aswell, Since the first Autocross, the car has been eating up backroads with very little noticeable ware, I can comfortably say that they could easily handle a track day at willow springs in 90+deg weather with the current ware and drive back to the bay area without a problem. Thank's Simple Tire for showing me what Accelera tires are all about!