Appreciating the pedaling efficiency of Rigida 27x1" clincher rims and tires I fabricated some adapter brackets to mount on my low-endmountain bike frame originally set up with direct-pull cantilever brakes. Conversion is made by removing the 26" mountain bike wheels and brakes from their mounting posts. By installing the horseshoe style adapters on the existing mounting posts the brakes can be remounted on secondary posts located higher up the adapters. Simply install 27" road wheels with HP tire sizes up to 1 1/8" having similar index shifting gearing geometry and readjust the brakes. Naturally, 700C rims with similar tires will have even more clearance from the frame. CONS are 1) having excessive brake cable housing from the "raised" brake post height and 2) increased bike leaning when utilizing the welded-on kick-stand with the larger diameter road wheels. I would attach photos if I knew how. This setup works great for my riding needs where one bike is desired for efficiently riding around town for most of the year while still accommodating mountain bike wheels for one week of mountain bike camp each summer. I'm wondering if there is a market/need for this kind of bracket?