Got a 21" Road Mountain Bike frame, welded by Lee Cooper, the Caribou Vamoose. It is 21" c-t however it's more road bike than mountain bike, but just takes 26" wheels. Lovely Dedacciai tubing (coffin profile). Looking for £150 for frame, forks (rigid straight blade), headset and mudguards. Clearly too small for me, but it rides very very nicely.