Kris Leeson's Prototype Leeson 660
Photos and descriptions by UK Ambassador, Paul Thomson

Kris Leeson's prototype Leeson 660 frame. Ultra short chainstays (check out the gap between rear tyre and seat tube), cool unpainted frame finish and finely tuned competition specific geometry could make this the new standard in lightweight stock frames.


Chainstays this short require a unique solution to the tyre/chainring clearance problem. The bottom bracket shell is an increased width (the cups of a normal 73mm shell XTR bottom bracket fit inside the frame) with a machined yoke joining the chainstay. The left hand chainstay is completely straight making for an extremely rigid rear end.


Other novel features of the Leeson frame: Rear axle is a bolt through design for increased rigidity. The hub is a modified Hope Ti-Glide - extra wide flange spacing for a dishless rearwheel and 6 speed titanium freehub body. The disc brake is a machined Hope item that looks more like a circular saw disc. The disc caliper attaches to both the chain and seat stays.


Derailleur mounts on a small plate bolted onto the chainstay