430keeper

When people change out their run-flats they usually keep the 245-40-R18 size. While
this leads to a smoother ride, it still puts the same sidewall height between the road and their
wheels. I want more sidewall for even more cushioning. Has anyone experimented with 17"
wheels and a 50 series sidewall?

PhilipMSPT

iTrader: (5)

I considered this.

I opted not to.

But if you Google some Euro images, the SC had a 17" option IIRC...

texsexlex

iTrader: (3)

...I can't remember if there is a thread about this,but there is a member here that has 17in tires on his SC. In his post, he includes pics also, you might try a search to see if you run across it

jzwu

17" wheels are too small for the SC430.

You can use 235-45-18 tires for a better ride.

430keeper

With the tires already sunken in the way they are, 235-45-18s might look
too narrow. Anyone know if the bolt patterns of the sc430 are the same
as the is,es, or gs models of similar years?

bb430

iTrader: (1)

IS, GS and ES have the same bolt patterns. The LS460 has euro bolt patten of 120. ES being front wheel drive might have offset that might not fit our SC very well (I'm not really sure), but I'm sure the 17" wheels with proper offset will fit our car. After all, the factory spare tire for SC is 17".

AJ@TireRack.com

You will increase ride quality significantly by going away from the run flat tires to start with if you go to a grand touring tire like a Continental Pure Contact or Bridgestone Turanza Serenity Plus tire.

The added sidewall will increase your ride quality, but only by a slight margin. Unless you already had in mind to also purchase wheels, the cost probably wouldn't be worth the slight amount of added comfort you would get. There may also be some trade off with cornering stability because of the more narrow tire you would need to use.

For a 2007 SC430, I show a 17" fitment is okay. On our website, the only way to find 17" wheels is to go into the winter section of the website once you enter your year/make/model. The tire size you would use is a 225/50/17 to keep your overall diameter in check.

-AJ

1sWt2GS

iTrader: (6)

17's are way too small for the SC! Smallest I would go with is 18's with a stepped lip or just 19's out right.

AJ@TireRack.com

The question is, has anyone experimented with a 17" fitment and would it gain ride quality. -yes, it fits. Would it add more comfort, yes but the margin would be very small and there would be a trade off with cornering stability.

I would offer a 17" all day long...but for a winter package. A narrow tire with a taller profile is better for winter use. A winter package doesn't seem to be the subject, but he could do it for all season, should he want to. To put it in a rather direct manner, I wouldn't recommend it for an all-season/daily driver use. I would recommend putting a good grand touring all season tire on the factory/18" wheel.