i have been running a rear chain mount kit from dax since january and am very happy with it. i talked to duane before i ordered from him and he was very helpful and answered all of my questions. the kit arrived well packaged and was east to install. i used a robin subaru motor from a friction kit and have had no problems. the kit is installed on a trek bike and it goes about 25 mph, about the same as the friction kit but without the problems with tires i was having with the old kit. i use my bike to get to work and it has been reliable and trouble free. i also enjoy going over wet pavement or riding in the rain without the friction roller slipping on the tire. as high as gas is now i am surprised that more people aren' using these kits.