Can you place the same size tires all the way around instead of Staggered. - my.IS - Lexus IS Forum
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Old 08-02-2007, 11:21 AM   #1 (permalink)
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Books Can you place the same size tires all the way around instead of Staggered.

I have a 2007 IS 250 with the upgrade 18" staggard configuration with
225/40R18 Front and 255/40R18 Back. My question is, can I place the same size tire on all four? I understand the TPMS and different diameters but has anyone actually done this with success?
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Old 08-02-2007, 01:43 PM   #2 (permalink)
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I haven't heard of anyone trying this. I think anything wider in the front may rub without other modifications....maybe some others will chime in....
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Old 08-03-2007, 06:56 AM   #3 (permalink)
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Quote:
Originally Posted by Hambone City View Post
I have a 2007 IS 250 with the upgrade 18" staggard configuration with
225/40R18 Front and 255/40R18 Back. My question is, can I place the same size tire on all four? I understand the TPMS and different diameters but has anyone actually done this with success?
Might be difficult since the rims have different width but I supposed you could put 235s or 245s all the way around.

TMPS shouldn't care, it just measures the pressure.

You'd have to make sure the tire diameters are the same as before.

Why do you want to do this, by the way?
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Old 08-03-2007, 08:50 PM   #4 (permalink)
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Originally Posted by cdeslandes View Post
Might be difficult since the rims have different width but I supposed you could put 235s or 245s all the way around.

TMPS shouldn't care, it just measures the pressure.

You'd have to make sure the tire diameters are the same as before.

Why do you want to do this, by the way?
I want to do this because 12k miles staggered per set of wheels compared to 40k miles per set of all season compound if you can rotate. My 07 IS 250 came with 140 treadwear summer compound. I think the savings is worth it.
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Old 08-04-2007, 10:11 PM   #5 (permalink)
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Quote:
Originally Posted by Hambone City View Post
I want to do this because 12k miles staggered per set of wheels compared to 40k miles per set of all season compound if you can rotate. My 07 IS 250 came with 140 treadwear summer compound. I think the savings is worth it.
Could be, but it may have other consequences, see here:
Dunlop Tires | Care & Maintenance | Rim width and aspect ratio

This is some very good information here as well, look about 3/4 down the page under the section "rim width range":
Tire Tech - Tire Specs Explained

Hambone . . . hmm, I wonder who that could be?
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Old 08-06-2007, 07:39 AM   #6 (permalink)
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Thanks, but I have already been to these sites. This information has been around for about 30 years or more. There is allot of grey area with the dynamics of tires. Just the air pressure of a tire can change the dynamics. All tread and side wall compounds have to go through some type of hysteresis testing. Look at the racing industry on how they change dynamics to get the most out of tires. Why would a measure rim width of 8.0 be approved by the tire industry standards but you can place a 7.5-8.0-8.5 tire width on the rim. I know if I was racing on a track I would look for perfection in my tires. One thing for sure, I am not racing my IS 250. I would like this car to look good with a wide tire and get mileage (be able to rotate).

The different between the IS 250 staggered front and rear is 0.9" (Bridgestone Front 225/40R18 Dia 25.1 and Rear 255/40R18 Dia 26.0). Notice that I am using Bridgestone diameter tires because if you use another manufacture recommended staggered pair the front and rear diameter may be plus or minus 0.1 or .02 (i.e. grey area). From my calculations using a tire diameter of 25.6 on the front and back, I would only loose about 800 miles after driving the car 50,000 miles and instead of 80 mph odometer display, I would be doing 79 mph actual.

rtp300 . . . hmm, I wonder who that could be?
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Old 08-09-2007, 02:56 PM   #7 (permalink)
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Quote:
Originally Posted by Hambone City View Post
Thanks, but I have already been to these sites. This information has been around for about 30 years or more. There is allot of grey area with the dynamics of tires. Just the air pressure of a tire can change the dynamics. All tread and side wall compounds have to go through some type of hysteresis testing. Look at the racing industry on how they change dynamics to get the most out of tires. Why would a measure rim width of 8.0 be approved by the tire industry standards but you can place a 7.5-8.0-8.5 tire width on the rim. I know if I was racing on a track I would look for perfection in my tires. One thing for sure, I am not racing my IS 250. I would like this car to look good with a wide tire and get mileage (be able to rotate).

The different between the IS 250 staggered front and rear is 0.9" (Bridgestone Front 225/40R18 Dia 25.1 and Rear 255/40R18 Dia 26.0). Notice that I am using Bridgestone diameter tires because if you use another manufacture recommended staggered pair the front and rear diameter may be plus or minus 0.1 or .02 (i.e. grey area). From my calculations using a tire diameter of 25.6 on the front and back, I would only loose about 800 miles after driving the car 50,000 miles and instead of 80 mph odometer display, I would be doing 79 mph actual.

rtp300 . . . hmm, I wonder who that could be?
I have an is 250 with a 19x8.5 all around. Its fine just make sure the thread size is matched to what you have now.
I only matched the sizes cause they came of an evo5 my freind just got ride of.
It will work, I feel like the ass is easier to whip around sometimes though. Buy the staggered fitment i want to upgrade to the 19x10.5 for the rear... maybe in the spring
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Old 08-09-2007, 07:39 PM   #8 (permalink)
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thats working backwards...the reason i got a RWD car was to have a staggered tire and wheel setup.

You can always replace the same size tire in a higher wear rating compound. There are many out there so you don't have to get the soft ass stock tires.

Quote:
Originally Posted by Hambone City View Post
I have a 2007 IS 250 with the upgrade 18" staggard configuration with
225/40R18 Front and 255/40R18 Back. My question is, can I place the same size tire on all four? I understand the TPMS and different diameters but has anyone actually done this with success?
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