firstly decide whether you are goin to be ridin natural or comp, a street frame won't be great for comp as these usually have smaller top tubes, check out the warrenty on the frame, make sure the bb height is over 12.5 '. check the tyre clearance, try to pushing the rear dropouts to see how stiff it is. and check out reviews on biketrials.com, if you buying a koxx make sure you can live without having a seat, hope this some help, please keep adding frames in and extra advice. thanks :thumbsup: