jake443

Hi everyone,

I have a pretty much stock 2013 GS350 with 18" wheels. My current tire size is 235-45-18. My personal opinion of them is that the tires, at least from the back look way too skinny, in proportion to the nice wide rear end the car has.

I was searching Discount Tire to try to see if I can up-size with a lower aspect ratio, give the allusion of a bigger wheel. The two tire sizes that help in a wider footprint and make the wheel look bigger seem to be 245-40-18 and 255-40-18.

I am very tempted to put on the 255's, and I believe the back would be okay, but concerned of potential rubbing in the front? Has anyone had any experience or know of any repercussions of up-sizing besides a little bit to the comfort and speedometer?

Thanks!

AJLex19

For the base wheels, the widest I would recommend would be 245. I believe 255 will be too wide for the front and cause rubbing. You can go with 245-40 but will lose some comfort as the 40 profile will be a tad skinnier. I may have to get tires soon (have 18" wheels) and was also contemplating upsizing from 235-45 to 245-45.

Here's a good tool you can use: https://www.1010tires.com/Tools/Tire...ismetric=False

bclexus

I run 18" wheels/tires and have chosen the 245/45 R18 100V XL BSW Pirelli Cinturato P7 A/S (P2337600) (Discount Tire# 14764) for my GS 350.

AJLex19

@@bclexus: have you noticed any difference at all with the 245 tires vs. your previous 235 tire?

Discount Tire

Thank you for your business. Nice to confirm fitment for the 245/45R-18 for your GS 350.

Jake, please let us know if we can help.

bclexus

No, I do not notice any difference between the two sizes.

jake443

Quick Update if anyone is interested: I ended up getting 255-40-18 and I love them. No rubbing and the tires are slightly wider then fender flares from the back and give the impression I have some spacers. I think it give the car a slightly more aggressive look and no impact to the drive with the exception of the speedometer which is very slightly off.

AJLex19

@jake443 Glad to hear you were able to get the size you wanted and it fit! I thought for sure the 255-40 would cause rubbing issues on the front - i guess with the stock offset (45mm) and stock wheel width of 8", 255's cleared. It could also be the tires you went with - what brand/model tire did you end up with?

jake443

I ended up going with the Yokohama Advan Sport A/S

I had Michelin Pilot Sports on another car and went with the Yokohoma YK series on my previous car, so I decided to do something similar for this car. I honestly think Yokohoma tires are a very close comparison to Michelins in terms of price vs value recieved...

Discount Tire

Thank you for your support, jake443!

thallium

Stock rims? How wide were they? Not sure if mine or 8" or not. I've got a 2013 lux pkg with the 18 spoke rims and 235/45R18s. Considering getting 245/45 next time I need tires to get a little more tread and a little more sidewall but don't want to go to wide and rub or be too wide looking for the rims.

bclexus

They are the stock Lexus 18" x 8" twin 5 spoke wheels, which are the same 8" width as your wheels. The 245/45 tires will work perfectly with your wheels and car.

thallium

Sounds good. Maybe I'll do that. 10mm wider and 4.5mm taller sidewall. A little larger footprint with slightly more sidewall give. Probably won't be anything very noticeable though. Worth it?

bclexus

You probably will be able to tell a noticeable difference, but it depends on your level of sensitivity and how accustomed you are to driving the car. I think the one-up size tires look better too. I personally want the GS 350 to have a decent ride.

I can tell if I have 50-60 extra pounds in the car, or after adding 5-6 gallons of gasoline...or 1-2 psi difference in the tires, or if the seat is adjusted ¼ inch different.