I made some changes to the sinister ridge to make it more xc friendly. New bars, seatpost, cranks, pedals, and tires. I had 2.5 kenda blue grooves on it before; great traction, but so slow. I really like the 2.35 small block 8s they roll super fast and hook up great even on wet rocks and logs. They would be prone to clogging up in mud with a lot of clay in it, but where I usually ride the soil has a sandy consistancy, the bike feels so much faster now. It weighs about 32-33 lbs now, it used to be around 38 lbs at one point.