The great 17 vs. 18 debate - Lexus IS Forum
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post #1 of 16 (permalink) Old 03-10-2011, 03:38 PM Thread Starter
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The great 17 vs. 18 debate

Hey guys, not sure what I want to so with my wheels right now as I am struggling to weight the pros and cons. I do know I will be putting some michelin sport PS2s on the car so have to figure out what I'm doing with the rims before I buy the rubber. I have stock 17 inch 225/45R17 that come on my 2007 IS 250 All wheel drive. I can use these rims for my snow rubber (which makes changes each season much easier.
- My main concern is with the 18s, how much bumpier will the ride feel. Is it significant or is it something I will not realize after a few days. As it is, I do not feel that the car is exceptionally smooth to begin with.
-Additionally am I correct in the information that the stock rims have a 45mm offset, and if so, is it most wise to stay with the same offset? What will happen from increasing or decreasing offset, in terms of driving?
-How much better is the handling on 18s than 17s and will I notice a difference if I happen to chose good quality light rims such as enkei racing rims.
Thanks for all the insight guys!
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post #2 of 16 (permalink) Old 03-11-2011, 12:27 PM
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go with 18's.
ride comfort will be based on tire size
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post #3 of 16 (permalink) Old 03-15-2011, 01:37 PM
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Originally Posted by 09starfire View Post
go with 18's.
ride comfort will be based on tire size
I believe the concern is with a larger wheels comes a lower profile tire. I always expect at least a small amount of a harsher ride with a shorter sidewall. Depending on the tire it does not have to be significant however.
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post #4 of 16 (permalink) Old 03-15-2011, 02:07 PM
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17s....just looks to small on a 2nd gen IS. Yes, you will feel a difference between the two...but nothing dramatic. Get a solid set of comfy tires and your set.

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post #5 of 16 (permalink) Old 03-31-2011, 05:55 PM
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Are you sure you can go with 18s with AWD?
I didn't notice that they were available as an option on the IS250. I'd check with the dealer to see if they should be fitted on the IS250.
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post #6 of 16 (permalink) Old 03-31-2011, 06:27 PM
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Originally Posted by flat89 View Post
Are you sure you can go with 18s with AWD?
I didn't notice that they were available as an option on the IS250. I'd check with the dealer to see if they should be fitted on the IS250.
for an awd vehicle the main concern is to keep the wheels and tires the same size all around. in other words there should be no overall diameter discrepancy between the front and rear wheels. This is generally the idea.

If you want the staggered look you can do something like 18x8.5 +45 front 18x8.5 +38 rear. This is fine i believe, just as long as you're running the same size tire on each corner.

Some awd systems are able to run a true staggered setup. for example, the gtr has a wider footprint in the rear than the front. I dont know how this works and i am very curious. It could be because of it's active yaw controller or some sort of clever center differential. however, from my knowledge coming from the subaru world... it is best to have matching size tires all around to keep the center diff happy.

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post #7 of 16 (permalink) Old 03-31-2011, 06:57 PM
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Go 18's. I work at discount tire, and with Michelin PS2's your car will drive smoother than ever. Michelin is one of the best manufactured tires for luxury vehicles. Soo there isnt really anything to worry about.
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post #8 of 16 (permalink) Old 04-10-2011, 11:04 PM
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Quote:
Originally Posted by canadais250 View Post
Hey guys, not sure what I want to so with my wheels right now as I am struggling to weight the pros and cons. I do know I will be putting some michelin sport PS2s on the car so have to figure out what I'm doing with the rims before I buy the rubber. I have stock 17 inch 225/45R17 that come on my 2007 IS 250 All wheel drive. I can use these rims for my snow rubber (which makes changes each season much easier.
- My main concern is with the 18s, how much bumpier will the ride feel. Is it significant or is it something I will not realize after a few days. As it is, I do not feel that the car is exceptionally smooth to begin with.
-Additionally am I correct in the information that the stock rims have a 45mm offset, and if so, is it most wise to stay with the same offset? What will happen from increasing or decreasing offset, in terms of driving?
-How much better is the handling on 18s than 17s and will I notice a difference if I happen to chose good quality light rims such as enkei racing rims.
Thanks for all the insight guys!
I recently purchased the 06 IS 250 AWD with the same intentions. What did you end up doing in terms of sizing, offset, etc..?

Also, does anyone know the largest wheel/tire combo that can be achieved without any shaving, rolling, lowering, etc..?

Thanks in advance!

Kay-B
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post #9 of 16 (permalink) Old 04-13-2011, 09:11 PM
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You can run 17s in aggressive offsets and it will look just as identical in size with high offset 18s. You can run 18s in the 2nd Generation IS300s. It's no problem. Its fine to run 17 or 18. I don't see the function of running 19s on an IS300 aside from aesthetics. What purpose are you going with the car? What offset do you have in mind?

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post #10 of 16 (permalink) Old 04-15-2011, 12:17 AM
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18's look better in my opinion and fill in the wheel gap much better

but 17's should be lighter --> better for handling?

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post #11 of 16 (permalink) Old 04-15-2011, 07:28 AM
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Quote:
Originally Posted by flat89 View Post
Are you sure you can go with 18s with AWD?
I didn't notice that they were available as an option on the IS250. I'd check with the dealer to see if they should be fitted on the IS250.
No, you can't fit 18's. Since the dealer only gave you 17's nothing else can be fitted. The other IS's just fit 19's and 20's only because they rwd...

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post #12 of 16 (permalink) Old 04-16-2011, 06:57 PM
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ie. just on the very small chance that people might just miss the heavy sarcasm above ^ :-P (who knows these days)

Just make sure you get the right tire to match the speed reading lol

You could also check tirerack.com to see which wheel sizes they recommend that fit if you want some kind of professional evidence that it'll fit.

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post #13 of 16 (permalink) Old 04-16-2011, 08:32 PM
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18's, definitely.
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post #14 of 16 (permalink) Old 05-05-2011, 10:28 PM
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18's, definitely.
yeah that
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post #15 of 16 (permalink) Old 05-06-2011, 10:32 AM
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  Lexus IS Forum > 2nd-Gen IS250/IS350 > Wheels and Tires

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