The offset is ET33 but I used to have 10mm wheel spacers on the rear but they were cheap shitty multifit ones so they didn't go back.
I've got some 16mm hubscentric ones to go on (I can always machine them down if 16mm is too much)
But there is alot of room in the rear now it's been completely chopped out just enough there to fit the plastic arches back on.

The rear chamber is set to 1 degree Neg it used to be 1.5 neg but i've found it better to get off the line with 1 neg.

Rich