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Re: Wheel swap...your thoughts, please, more, long (archive)

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Posted by Gregg on December 09, 1999 at 09:43:48:

In Reply to: Wheel swap...your thoughts, please, more, long... posted by Galo on December 09, 1999 at 07:38:40:

: OK...I'm gonna do it, want thoughts/opinions
from the wisdomed friends on this board. I've been
a good boy to wife, family, God, et al...stock
market's been good to me this past
year...Christmas present in gonna be some AC
Schnitzer Type IIIs with Dunlop SP9000's. Dilemmas
as follows:
: - 17" or 18"??
: - Same width all around, say 8.5", or 8.5" front
and 9.5 rears?
: The 17" to 18" decision will be based on just
how much rougher the ride will be with the
lower-profile tires needed on the 18" wheels -not
a trivial concern on our fairly rough roads.
: The width is more difficult as one part of me
says that if the car basically understeers -which
it does, why would I want to add more rubber in
the back? On the other hand, will the car look
'empty' in back with same 8.5" wheels all around?
: Those of you who have upgraded wheels similar to
this, please describe your combination and
opinions/what u have perceived relevant to my two
concerns & many thanks -Galo

Run 8s front and 9s rear per stock 540 Sport on 17s. They're the best "compromise" (in the good sense of the word)..remember, with all the craze over 18s ('cause of the M5, etc. and the fact 17s have now been around awhile and folks are looking for something new, right or wrong), they're much more susceptible to rim damage in real world driving conditions (the 17s aren't great in that regard either compared to the stock non Sport's 16s). The 17s give you a sufficiently short sidewall to address crisp handling concerns. If you've got the Sport to begin with, then stick with the 540 f/r tire sizes (235-45s and 255-40s respectively. If you've got a stock Non Sport AND are not planning to lower with a kit, then try the "true" Plus One to the stock 16s of 225-50-17s front, 245-45-17s rear with Mich MXX3s (or XGTZ4s if all weather's a concern)--these are about the only two Z rated tires common between these two sizes--for staggering puproses. Running the Sport's tire sizes on a non lowered car makes the tires look too small from the side (leaving a lot of wheelwell exposed) and also means different speedo (and hence odo) readings...accumulating more miles than desired. If wanting to go wider up front, I'd stick with the 8s all around and put the 245s on each corner. BTW, 255s are too much to run in front regardless--even the M5 "only" runs 245 (18s) in front. 8.5s ok all around with 245s. Optimally, they're a bit wide for the 225-235mm range, esp 225s, but merely "ok" for 235s. If insisting on 8.5s all around but want to go 18s, stick with 245-40-18s all around...with the idea being that you should never run different width (staggered) tires on the same widths (e.g., 245s up front on 8.5s, 265s rear on 8.5s). If wanting the staggered width tires, use correspondingly different width rims front and rear..Finally, if wanting to run 18s, to make the change (along with ride, rim-damage risks) "worth while," do it "correctly" and run 245-40 fronts and 265 or 275-35s rear on staggered rims of 8.5s front, and 9.5s or 10s rear--in a similar set up to M5's. BUT, 245s all around on your 8.5s (all around) would be fine. Good luck.

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