I got an on-one other doofer. I did a review of it here http://www.bikeforums.net/showthread.php?t=414050 although I need to patch the image links. My current opinion is that it's not well suited for the lower gear ranges I wanted. When I get some cash, I'll be getting the Soulcraft Convert. The other advantage of the convert is that it releases so you can remove the rear wheel without tools . On the off chance it might work on your bike. I'd be open to selling the other doofer if you want to try it out.