poorbong

iTrader: (9)

Rather than going w wider rims....im thinking of going w wider tires. Any set-backs or complications i should be concerned?

jonez

what sizes are you thinking of?

My summer tires are 275/30 front and 305/30 rear, but that’s with 19x9.5 front and 19x10.5 rear so a slightly wider wheel that can still run stock tires and support wider.

One thing to keep in mind is if you go wider the overall radius of your wheels will be slightly larger or smaller, which means your odometer and speedometer will be off slightly.

lobuxracer

iTrader: (2)

How do you figure? Do you mean if you arbitrarily keep the same aspect ratio and go wider the wheel diameter will change? That would be true. But if you choose the right width and aspect ratio, it will maintain the OEM diameter and everything will continue to work as intended. For example, the OEM rear tire on the IS F is a 255/35/19. If you replace it with a 295/30/19 you'll have the exact same rolling diameter with 40mm more section width. The only trick is to be sure the rim you are using is wide enough for the new tire you wish to install.

TOPENDMS

The best tire width is usually the factory width. Wider wheels are used mostly to get a deeper lip on the rim. Even with wider wheels I would try to keep the factory tire widths.

jonez

Yes but specifically for the GSF, rear is 275/35, I stayed within a 2% difference in diameter... if you want equal you could go with 335/25 on 20s but I wanted to stay with 19s.

flowrider

iTrader: (9)

That is sometimes true, but usually not! The GSF will benefit with wider tires, and wheels, if the owner is prudent and knowledgable with his/her choice!

Lou

lobuxracer

iTrader: (2)

If you are talking visual performance I would agree. For mechanical performance, the GS F needs as much rubber under it as you can stuff in the wheel wells because the car is so heavy. A Supra at 3400 pounds tracks best with 315s on all four corners. GS F and RC F at 4000 pounds could use 335s all day long if they would fit, but I don't think there's any easy way to fit a tire that wide to either end of the car.

jonez

im running 275/30 front and 305/30 rear, it’s about as wide as you can go and still have a flush look. I’d be interested if someone here was running wider

poorbong

iTrader: (9)

Can you post some pictures?

1A1

You definitely shouldn't run a wider tire on a none-wider wheel. If the tire is a 305 or roughly 12 inches of cross section, your wheels should really be at least 11 inches wide. 11.5 would be better. If you don't run the proper width wheel with a wider tire, you'll get a lot of tire squirm, especially on a heavier car, which in turn actually hurts the handling of the vehicle.

Steve

flowrider

iTrader: (9)

^^^^jonez is NOT on stock width wheels. He's running 9½ & 10½. A 305/30 has a width range of 10½" to 11½". A 275/30 has a range of 9" to 10". So he's golden.

Lou

jonez

Here's my original thread

https://www.clublexus.com/forums/gs-...ew-wheels.html

A few more:

shu5892001

Does anyone know if I can fit 285/30/19 in the front on a 19x9.5 +38 rim with stock suspension?

I tried searching around all threads are on about going widest in the rear.

I plan to do 305 in the back and want to keep the same staggered ratio.

Thanks.

imdrax

you ever end up doing this?

UZS160

iTrader: (1)

Was also wondering if the 285/30 in the front was accomplished in my case it will be going on a 9.5 +22