Rear wheel socket size

55 mm

Just search 55mm multi point socket and you should be able to find one pretty easily. Just FYI the rear is a bitch to get off by yourself. You need a rear wheel stand and a block of wood helps as well to jam the rear brake . Also , a second set of hands doesn’t hurt . I had to use an impact wrench to get mine off which I was able to get done successfully by myself but it was a bitch to do. Having someone hold the bike and the rear brake makes it so much easier and safer to do. I was being pretty gingerly as I was afraid to drop the bike by being overly aggressive. The rear wheel gets tightened back 230nm as well just FYI . I think it’s about 180 ftpnds. Good luck !