Big Silver

OK, Probably I shouldn't ask such a simple question, but if I go from the stock 16 in. wheels to 18's what would be an appropriate wheel width and tire profile/size?

If I was to use the +1 rule, my profile should drop from 55 to 45, and the width should go from 225 to ?255? on the tire.

Would the wheel width go to 8 or 8.5 on this, or does it matter?

Speaking of such, where might the best source for OZ wheels be pricewise?

Thanks All

Neo

iTrader: (3)

Hi. Welcome to CL. You might get more expert responses if you post this in the wheel forum. A moderator may move this anyway, so ...

For a quickie response, if you go to 18s, you should go to 8.5 widths. You can also go staggered with 8.5 fronts and 9.5 rears. I've also seen 9f x 10r or 8.5f x 10r. Fender mods may be needed for the larger sizes. It is really up to you what you want to do.

Tire size will go to 245/40 and 275/35. These are some typical and safe sizes. There are people here who are more aggressive with the sizing but with nice results. Hopefully, they will chime in to give you more info.

Good luck.

Johnny Mo

The width of the wheels will determine optimal size, but the Tirerack sales reps are extremely knowledgable and helpful in that regard. Our own vendor sponsors Wheel Experts and Wheels Boutique guys can also help. As far as the O-Z Wheels pricing goes, O-Z has a clearance section at their website for discontinued models, and the Tirerack carries most of the currently available O-Z wheels with very good pricing, but you should also check with our vendor sponsors. As soon as I sell my 17" O-Z's, I've got my eyes on a set of 18"O-Z's.

SoCalSC4

Big Silver: what kind of car are you working on?

Big Silver

Sorry, that would be a 2000 GS 400 with mild mods:

L-tuned springs and struts and steering ECU, and TRD sways with TRD STB (front) and Tom's rear LCB.

I had to do these as the handling on stock GS in my case was TERRIBLE, and really no fun to drive, reminding me of the worst in Cadillacs. It is better now but could use some wheels with the local roads in DC Metro area being a limiting factor (also don't want to look like a drug dealer). Will keep the sucky 16's for winter weather...

I am gathering that 18x8.5 might be the best wheel choice with ~255 tires in ~ 40 profile though no clue of which brand - the stock Goodyears also were terrible...

GS4Will

18x8.5: 245/40/18

255s would be bit taller in overall diameter, and the tyre selections are more limited...and not sure if front might rub..

tyres: yokohama avs es100, one of the best values, if not the best currently on the market, esp if you are in the DC area..imo...

kuruption213

big silver i'm having the same problem, i'm also in the dc area and just upgraded to 18 x 8.5 from 16s. bought the rims used and they currently come with tires that are 265/35 in the rear and 245/40 in the front. i want something that will be the same all the way around when i upgrade, probably get 245/40 like gs4will said. you should check out radial tire (silver spring) they usually have good prices and service.

Neo

iTrader: (3)

You can fit 265s on a 8.5 width?

zenki300

iTrader: (3)

Hope this helps because I'm also running an 18in. ride setup.

my stock wheels were: 16x7.5 215/60/16 all around
offset: 55+
weight: 43lbs total tire/wheel together rims:18lbs

As for my new rims: forged aluminum Yokohamas
new 18's: 18x8 front tires 235/40/18
18x9 rear tires 265/35/18
offset:front 30+ (preparing for brake upgrades in future)
rear 35+

weight: front 43lbs/rear 48lbs for the tire/rim combination
rims weight: 18x8 19lbs/ 18x9 19lbs

the rims are also flush with the sides, not sticking out "lowriderish." And no rubbing against any suspension or fender parts.


After calculating everything, my tire setup was roughly off a couple inches compared to the 16's overall tire/rim outer circumference, in other words, it turned out smaller by a bit. But when compared to the stock 17's sold on other GS's with the 235/45/17 rubber, the figures were close to those specs... I hope I'm making some sense? So your actual speed on the speedometer might be slightly less (maybe 1 or 2mph off the original settings).

As for tire sizes to run, 8in width usually has 235/40 mounted (235/45 would be better to match stock circumference, but the tire size is rare and so a bit more expensive), and 9in. width usually has 245/40.
And the general rule is that you can usually go about 20mm more or less than those sizes for the respected rim widths. For example, 18x8 has a general range of 215 to 255, with 235 as the base size. Going over/under this is possible, but might cause some safety hazards... like wheels sliding on the rims due to lack of rubber to cover entire width of the rims.
Well, that's all I can remember, I'm not an expert at this... but I did stay at a Holiday Inn. Anyways, there you go, some references, but those guys at the wheels forum should be able to clarify anything I missed.

That is all

Big Silver

Thanks, all. I think that I will try to keep all uniform size and pray to the god of potholes plus keep the 16's for the worst of weather.

I too go to Radial Tire and they have always taken care of me - I wonder if they have the Yoko 100 ES series & will ask them .