Went for my first ride today on new 2011 TE310. Came from CRF450X Honda. I am 51 158 pounds and 5'6". Put the 50 tooth rear and removed all the smog stuff. Scotts damper and other misc upgrades. Stock suspension. Bike was awesome but as I expected when I bought the bike it suffers at high speed. Actually you can't get to a high speed without turning some serious RPM's. I don't need to got 80 so I am ok with it. If I do a long desert ride I'll put on the 40 tooth rear. Can't have it all. I can't take those larger bikes anymore at my age and size. It was 92 degress and the bike ran fine. If you are my size and weight and are considering this bike I would recommend it. The power and stock suspension are great. I was pegged in 6th just flying through the trails. Enjoy.