Suitable Replacement for FH536
"I took a punt and it worked out, the knackered one on my wheels was marked FH536, and this Crank bros one is marked FH531, I looked at the images on the Bikeparts website and figured it was close enough so bought it, it fitted to my Syncros RR 2. 0 disc wheels fine (11speed Ultegra) however there was a difference, the length of the body was a couple of millimeters shorter, so i removed the spacer at the back of my cassette and all works fit, didn't even need to re-index my gears amazingly. This Crank bros FH531 was way cheaper than all the other 'FH536' freehubs i had seen, hence the punt."