dsdfan

My IS250 will arrive with 205/55 R16 wheels. I am planning to upgrade to upgrade to the stock 18" configuration, but with aftermarket Rays Volk Wheels:

Front: 225/40/18, 18x8, +45mm
Rear: 255/40/18, 18x8.5, +50mm

Q1: Can anyone with stock 18" wheels advise if this causes the front wheels to contact the plastic of wheel wells at all when steering is at full turn? I would like to avoid even the slightest rubbing when turning the car. If there is any rubbing with the stock 18" configuration, I will use the stock 17" configuration instead.

Q2: Can I use 245/40/18, 18x8, +45 for the rear wheels to attain lighter weight, thus faster acceleration, better consumption and lower noise?

Thanks for the advice!

4TehNguyen

iTrader: (1)

if you get correct tire size to be the same as 18" overall stock diameter you wont rub

tqlla3k

iTrader: (1)

How can your car come with 16s? I am pretty sure 17s are standard.

ybing

If u can...dont get stock 18" = =...the Dunlop tires are not good enough =..="...

dsdfan

Thanks, 4TehNguyen, for the kind information about the stock 18" configuration

For some non-US markets, the base IS250 model is "equipped" with 16x7 205/55/16 wheels. These give the IS250 the "Corolla" look.

I'm sure 16" wheels have the potential of being quieter and more fuel efficient.

tqlla3k

iTrader: (1)

i think you may be better off using 255/40/18s, since there is probably a setting to set your speedometer to that tire size.

Otherwise you want 245/35/18 or 225/40/18s to keep the outer diameter close to what you have.

Finally, 245s require 8.5" wheels for optimal performance

You can also search on ebay for wheel+tire set ups. Thats your cheapest and easiest bet. I see a set going for $800, and one that just expired(unsold) for $1200. The $1200 on will probably be relisted soon.

tqlla3k

iTrader: (1)

But the OP is from Michigan. I didnt know 16's were available outside the US... must suck!

t0e

iTrader: (1)

You should be fine with the (245/40/18.5 / +45) offset in the back, with no rubbing at all.

chuckb

Lexus would not put the 18s on IS from factory if there was even a chance they could rub.

dfw350

+1

ptmIS350

huh? have you checked the reviews on the dunlop sport maxx on tire rack?

ES3

^ What he said. I LOVE my Dunlops!

federalman

I got Michilin with my IS250 here in Taiwan.

they are ok, I just don't drive enough to know if they are good or not.

4TehNguyen

iTrader: (1)

what model michelins are they Energy MMVX4 or whatever, they are junk if they are.

Dunlops that come on the 18s are suprisingly good for an OEM tire, as most OEM tires are junk

t0e

iTrader: (1)

That will work....

Just get the correct tire size!

225 or 235 / 40 F and 255 (I hav eseen 275's but i think thats way to big) 40 Back.

Should be sweet...