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Old 03-20-14, 09:56 AM   #1
Pfucterpus
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Default Tire size question 18x8 97 ls400

Which size tires should i get for my LS? the rims i'll be getting are 18x8.

Should I go with 245/40/18 or 225/40/18? When I go to purchase rims with tires, it suggests the 225. My winter tires are 225/60/16. I dont know a whole lot about tires. But what will be the main differences? I know the 245's will be more expensive. But with the 225's will i lose handling or traction? They'll probly wear quicker, but by how much? I'm not even sure how the 245's got tossed into consideration.

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Old 03-22-14, 01:32 AM   #2
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The stock 225/60-16 diameter is 26.6". That is the rolling diameter that you want to match as closely as possible. A 1-3 percentage of variance will not be obvious except in overall MPG.

The 225/40-18 has a diameter of 25.1 and except for width, this is not the recommended size in a typical +2 wheel-tire combination. A 245/45-18 is nominal and a 245/40-18 or 255/40-18 is acceptable. The 245/40 size is widely available and at price points for most budgets. This is the popular choice for those who want a bit of improved handling due to the shorter sidewall.
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Old 03-22-14, 07:15 PM   #3
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I used some sizemytires calculator, and i think it was recommending 255. I'd much rather go with 245's though, they're a lot cheaper.


It says going to the 245's would be -3.4% different than the original, which could cause brake failure when changing more than 3%?

The 255's are -2.22% different from the original

Whats up with the brake failure part, anyone find that to be true?

245's would be awesome, but not if i'm trading potential brake failure for it haha
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Old 04-05-14, 12:57 PM   #4
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the 245's are fine. Those or even smaller tires will not cause brake failure. The change in tire size will throw the speedometer readings off. I agree that the prices of 245/40-18 is priced more competitively due to availability. This is an acceptable choice for the wheels you mentioned.
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Old 07-17-14, 07:26 PM   #5
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Can someone explain why a tire would cause brake failure ?
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Old 07-26-14, 09:40 PM   #6
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Brake failure will not happen by changing tire sizes. The situation will be speedo errors depending how significant the change in diameter is. What tire calculator is this? I'm curious to read the boiler plate that states about brake failure by having a 20mm wider or for that matter any difference from a stock spec tire.
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