I am interested in 5zigen 5zr Copse in 17"x7.5" +45mm, all the way around. Will there be any rubbing problems, on my stockS2K? Also, will they stick out of the wheels wells? If so how far. Thanks for any info.

 

If you don't lower it, it maybe ok. But you'll lose the advantage of having a wider rear wheel. Greatly hinders the rear-end handling.
Depending on what tires you use, it may stick out about 1/4-1/2 inch.

 

Without lowering, I think you won't have rubbing problems. Your wheels will stick out a tad bit.

 

Rears won't stick-out since they are only 7.5's (in fact you'll clear without rubbing to the snubbers).
Fronts will be flush w/ 205's.

IMHO, Don't do it, same size F/R not good.

 

i test drove a red S2K with 19" zennetti chrome rims, nitto 225/35's. stuck out approx 1/4-1/2".

i only drove on city blocks, but it felt great....a true go cart. even though those wheels must weigh shitloads,
with the 35 rubberbands, it still rode great due to the relatively compliant stock suspension. did not rub,
but may not have fully compressed it.

if they made a 245/30 19 to match outside dia. of 225/35, i would definitely go for 19's on the street with proper offset wheels. those KATAN's would be nice....for $4000 they should be.

u can put different size tires on same rims to get stagger for handling or looks, but better off 8.0 for all 4 if u can find it

 

whoops, i forgot my point!!doh......equal size tires works good on the s2k, as long as u don't need real high speed grip. on the street, u will get less understeer, and better turn in . u will have more fun and progressive
rear slidability. but u will have insufficient rear grip for very high speed committed turns, will need to be progressive with the throttle. good compromise could be 215/225 or 225/235 if u can get appropriate outside diameters.