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Is250 Tire Question


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Hello everyone,

Newbie here. My finace has an IS-250 and needs new tires. She hardly drives the car so performance isnt really an issue as long as its safe. Has anyone used 4 tires of the same size all the way around? The fronts are 8" and the backs are 8.5". So could I just slap 235 40 R 18s on all four wheels? Or might that cause a seal problem when the tires from the back went to the front?

The purpose of the question is to get a set of 4 matching tires which could be rotated, extending tire life.

Thanks in advance for your help, this marriage business is getting expensive.

Oh yeah, its an 07 RWD with the 18" wheels

Mark

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There is flexibility on tire size for rims, you do not want mfg installed. Below is a chart that I found on this site that explains the upper and lower tire width for each wheel size. As you can see w/staggered wheels you can still put same rubber on. 235's would work on both the 8" and 8.5", so would several other sizes (bigger and smaller). If you did keep same size, I don't think you can rotate given wheels are still different size. Your local tire place can confirm and assist.

50 Series tires and above (215/*50-75*/)

(mm) = (Rim width)

215 = 6" - 7 1/2"

225 = 6" - 8"

235 = 6 1/2" - 8 1/2"

245 = 6 1/2" - 8 1/2"

255 = 7" - 9"

265 = 7 1/2" - 9 1/2"

275 = 7 1/2" - 9 1/2"

285 = 8" - 10"

35-45 Series tires (215/*35-45*/)

(mm) = (Rim Width)

215 = 7" - 8 1/2"

225 = 7 1/2" - 9"

235 = 8" - 9 1/2"

245 = 8" - 9 1/2"

255 = 8 1/2" - 10"

265 = 9" - 10"

275 = 9" - 11"

285 = 9 1/2" - 11"

295 = 10" - 12"

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Hello everyone

I'm newbie, i was thinking on putting some 20' rims on my IS250 but not sure on what size tire to use. I was looking at some others IS and saw some of those had different size tires in the front and different size tires in the back why is that and what size tire should i use. Thank you

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yes you may. I have 4 x 235 40r 18s all around. No issues there. But it does slow your car down (heaps!) and I found it does increase fuel consumption a tad bit.

Hello everyone,

Newbie here. My finace has an IS-250 and needs new tires. She hardly drives the car so performance isnt really an issue as long as its safe. Has anyone used 4 tires of the same size all the way around? The fronts are 8" and the backs are 8.5". So could I just slap 235 40 R 18s on all four wheels? Or might that cause a seal problem when the tires from the back went to the front?

The purpose of the question is to get a set of 4 matching tires which could be rotated, extending tire life.

Thanks in advance for your help, this marriage business is getting expensive.

Oh yeah, its an 07 RWD with the 18" wheels

Mark

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