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I've read everything I can find on 200tw tires. GRM says the CRS (CR-1) come up fast, 1st lap being the best. Great for AX or TT but not lap after lap. I have yet to see anything saying the the RT660 is faster than a Rival-S at AX or road course but they are cheaper. I autox Rival-S. 65 + runs since 19' and they are still usable while others have swapped tires and I'm still placing the same at the end of the day. This is the last season on them though.