Have a 2013 800 eps

For rims considering:
Motorsport Alloy M20 / Kore 14×7 3.5+3.5 offset

For Tires
Bighorn 26×11 (rear)

or Kenda Bear claw HTR 26×11

Would I need spacers for the rear motor motor mount?

the other rims i am going to look at are the ITP SS212 14×8 in the rear but dont know the offset.