A friend sold off his BMWs and had his Pit Bull stand left over and I got it. The pin was a tad too large but I spend a minute with the lathe and just skimmed off a little bit. It's 53mm now and I think is a perfect fit, so 52mm would also be fine. I don't know why his BMW pin was bigger than other BMWs mentioned above, but it was clearly bigger than 53mm when I got it. I'm still a little tentative getting the bike up and down on the stand, but it is nice to have.