They are amazing. I have 9" inch Carbides with 1" track and 153 1.175" Megabites. I would definitely go 9". I thought it would be very hard to turn, but it is the lighest turning, sharpest carving front end I have ever tried. They are worth the money and absolutely transform the sled, no push at all. Make sure your toe-in/out is set correctly though as it will oversteer severely if the ski's are towed in at all.