5 Bike Mike bought the roll-in chock at Princess, and I thought worked very well - but I haven't seen it again. It is blue, Mike paid $50 for it, and as Ken says, it was a copy of a $250 one, like Terry Miller has. It worked - we tried it out around my place - on average 18-19" front tires in the 90-120 range, or 17" x 120 modern sportsbike wheels, though it didn't like 130/16 fronts, as some big cruisers have. This was about three months ago.