18' Series Wheel Size

simond

Member
Jan 6, 2012
47
2
8
Adelaide SA
Hope this doesn't sound to dumb, but can anyone tell me what is the size of the std wheels on the 18' ?
Will the O/B wheels fit the std hub or not?
We are having the STD 18.75.5 MODEL UNDERSLUNG & I would like to put meatier tyres on same as the O/B model. Or is it not that simple:noidea: