Bicyclists train during inclement weather and/or warm up for races on stationary equipment. The more experienced and talented ones prefer and use "Rollers". An example of Rollers can be found here:[login to view URL] I have searched high and low for a set of rollers that can be transported and assembled easily and without tools. I have not found any. SO... I'd like to design and build some. I have some concept ideas, but need somebody to turn these into a set of working files that could used to fabricate the parts.