Rear brake disc rotor replacement which size socket? HELP

[twobob]

Hi all I replaced the rotors and discs on the front of my 2012 enterprise recently and want to do the same on the rear. I haven't got big sockets only sockets going upto 27mm I think. Would like to know what size the hub nut is under the bearing cover on the rotor so I can change it on the day without being stuck. Also why is the rear on a bearing and thus they are like twice as expensive to buy the rotors... I understand ill have to replace the nut too, this is the nut I want the size of so as to buy the correct socket but cannot find the size anywhere not even in the Haynes. 

So in summary what is the size of socket I need to get the hub nut off and does it need to be a deep socket any other tips?

Thanks.

[ffrenchie]

No tips.

Order new ones and get a socket to fit. 36mm according to eurocar.

[geoff]

Can you not simply measure it ???? ( measure across the flats )

[twobob]

Can you not simply measure it ????  ( measure across the flats )

Yeah it was 36mm and fookin tight as a nun!!