Originally Posted by
Malicioso
the main area in which the rear rubs is where the rear bumper meets the rear fender, even if your lips ave been rolled it will still rub on there even with 18x8.5 wheels in a moderate offset.
This is true. KU-36, 225/45R18 on 18x7.5+48 in some cases will scrub on the plastic mudpiece thing.
I had two sets, same tyres - first set did not rub, second rubbed. I suspect camber adjustment at alignment was the difference between the two fitments.
I would place a small bet that if you can't find a rub anywhere else, it's the plastic mudgaurd piece on the rear side of the arch attached to the bumber etc. If you look closely you will see that it protrudes inwards just a little bit. If that's your culprit, shave away some superfluous plastic.
This point of contact I suspect is more prone the larger your tyre circumference. so 225/40R18+48 not likely to see it. 225/45R18+48 do. Sometimes. 1/3 tyre sets in fact.
On 235/40R18+50 (on RX-8 rims), you should have more clearance than Rino. 4mm more clearance to be precise. So anything your rubbing on will be rubbing worse on Rino's.
If at 225/45R18+48 I can see rubbing, then I would expect that 235/40R18+48 the guards must be rolled well back. What I mean there is with 225/45 I have to push the gaurds back a little to ensure no rub and also trim plastic piece. With 235/40, I would have to push the gaurds back the same amount, plus 5mm, and maybe or maybe not shave plastic.
Assuming everyone wears 225/45 :
I'm a +48 offset - Rino needs 2mm more gaurd clearance than mine, being +46, and Scaredycrow's +50 needs 2mm less clearance than mine.
When Scardydrow fits 235/40, he then needs 3mm more clearance than me - accounting for tyre width.
Just trying to help y'all understand the clearance and offset relationship.
I would suggest :
(a) Check plastic mudpiece.
(b) Don't just look up at the top of the arch, check the full arch. Contact can occur to the side, generally rearward. Quite a surprisingly long way back on the arch, actually.
(c) Alignment appears to be a factor if it's a tight fit
(d) Tyre choice can also be the difference between a rub and not (square sidewalls etc.)
Last edited by Nexus; 24-11-2010 at 07:58 PM.
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