Had my Metz installed today, my conclusion, GPS shows,OEM was 66 [email protected] rpm now 64 mph only 2mph diff. as stock dia. is 26.60 metz 25.9 not significant to notice. what is noticeable is noise, much quieter on the metz, profile looks narrower do to a more rounded tire, handling in twistees way better. Hope to get more than the 6k stock tire got me. The center of the stock oem was thin enough it felt like you could push your finger through it, an I was going triple digits on that piece of crap, a cheap tire, it was always kept at 42psi.Idont care what other riders thik, I will never run the Excedra again!!!