yeah the wheels arent the best for grip, but soon rough up abit and get better... we used them mainly because they weight next to nothing.

Tip- under load (while pushing) you will find the rims spin inside the tyre... i took the rims apart, and put a layer of tiger seal around them, then clamped it all up together (making a total mess in the process) but after it set the tires really take some effort to remove.

Design looks great by the way.