I have Tricked Toys wheels and Mountian Machine Performance wheels on 2 sleds, 6K+ on 1 and 7K+ on the other. Yea, they are pricy but we like them. I did have a single ply track have the reinforcement rods poke thru the inside windows, SD claimed is was my bad due to I changed the wheels thus reducing the dampening . I think other wise. I replaced the single ply with a dbl ply. no problems. F-um