Well understand the arthritis being a fellow sufferer.!!just back from cortisone injection so should feel marvellous tomoz!!! That will be one fit Springer!!! I will keep on searching as think the rholoff is the way to go.I bumped into a guy with a surly in Bold st lpool who says its brill but you can hear a noise in low gears but I've not experienced using a rholoff yet but will do soon hopefully,hope that knee improves!!