Their web site only shows the ProMotion model? Is it the same wheel? I have a set of the ProMotions on my QR Zero Gravity with about 1000 miles with no problems. However I am 141 lb rider so I can not comment on heaiver riders and these wheels. They list on ebay from time to time. One thing, the decals on the ones I got had to go. Just plain ugly. From looking at the web site I am guessing that they outsource the manufacturing.