Anyone know what size I need for my 2008 S80 to remove the bolt that holds the rotor on?

 

I believe a 10mm. Its not screwed on very tight. If you have an adjustable wrench or even vice grip pliers, they will do the trick. That bolt is really only used to keep the rotor on during assembley and if you want you dont need it. After that bolt is off you will still need a rubber hammer to get the rotor off the hub.

 

Ok, thanks for the tip!