Quote:
Originally Posted by Cruising Boy
So the bigger the offset the wheel gets more close to the fender which may cause rubbing right ? So what do you guys think about 8.5, 45 mm offset front and rear or 8.5 , 45 mm offset front and 9,5 , 35 mm offset rear ? Are these options reasonable or once again I am in delusion  ?
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To some extent the actual rim width doesn't matter as the overall width of the wheel/tyre package will be determined by the tyre itself. For instance, a 225 on a 7.5J rim will be wider than a 205 on the same rim.
To determine if a particular combination will fit:
1. Consult the manufacturer's data sheets and find out the width of your chosen tyre size when fitted to your chosen rim width.
2. Divide this overall width by 2
3. Deduct the ET (offset) from the figure determined in step 2. This is how far the sidewall of your new tyre will protrude from the face of the wheel hub.
4. Add the ET (offset) to the figure determined in step 2. This is how far the sidewall of the tyre will intrude from the face of the wheel hub into the wheel tub.
5. Measure the width of your current tyre across it's widest part and repeat procedures 2,3 & 4.
6. Compare the dimensions to determine where the new sidewalls will sit in relation ot the existing ones (i.e., the new set-up may protrude 15mm more on the outside and 10mm less on the inside).
7. Using this information, carefully measure on your car to see if there is enough clearance when the car is static with the front wheels facing straight ahead.
8. Turn the front wheels onto full lock either way and then measure again.
It's not foolproof as there are things like chassis dynamics, tyre shoulder shape, etc to consider. But at least you'll have some idea if you're even in the ball park with your new selection.
It's my guess that 9.5J/ET35 wheels won't begin to fit on the rear as you'll need something like a 265/275 tyre, and there's no way that's going to clear using ET35!