Used BMW rear drive from an r80gs or an r80st as these were the only single-sided swingarm bikes that use the three three pole rear wheels with three lug nuts. This is a 3711 drive so that means a 336 ratio. I don't honestly remember if they made more than one ratio for these bikes or if this was it. I know the later four bolt bikes had several ratios. Rear drive only made for a few years. I would suggest at a minimum pulling the drive apart and replacing all the seals if it was for my bike, I'd probably replace the bearings also. If once opened up anything looks to have where. Please look at the pics. What you see is what you get. I do not know how many miles are on this drive but overall appears to be in pretty good condition. Ebay's shipping sometimes looks very expensive. I do not make my extra money by overcharging you for shipping and I always refund the difference if the shipping I use is cheaper. A lot of the time on these heavier items, FedEx is cheaper than USPS. Thank you!