Moots has the option listed on their website. I am wondering if anyone is riding one and what effect the travel, albeit minimal, has on the chain tension, etc.

Poff has one maybe he'll chime in.

http://forums.mtbr.com/showthread.php?t=52689&highlight=moots

http://forums.mtbr.com/showthread.php?t=53108&highlight=moots