BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > 18x18 ET43 - What tire size?
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      02-15-2022, 12:08 PM   #1
eazyfire
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18x18 ET43 - What tire size?

Hey

I am in search of new wheels and have selected 18x8 et 43 rims. My question is which tire size I will choose.

I have two options.
1. 235/40 on all fours.
or
2. 225/40 front and 245/35 rear.

My plan was to run 245 on all four but it could rub and need spacers so i skipped it.

Today I have 225 on 17x8 rims but I think they are a little too stretched and that the rim edge stands out a little too much. The original 18" rims run on the second option but the front rims are 7.5x18 and thats why the edge doesnt stick out that much.

My question now is what you would choose?
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      04-12-2022, 05:07 PM   #2
Fishee
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215/40 and 245/35 are an OD match.
225/40 and 255/35 are an OD match.

If you're running a square setup, I would use 235s.
If you want to run a narrower tire up front, I would not use anything under 225 for an 8" wide wheel, it's too narrow. Even a 225 is a bit narrow for an 8".

If you want to run staggered, go with 225/40 and 255/35.
255 is a tad wide for an 8" wheel, but better to have more tire than less in this case, I would argue.

If you want to run a square setup with 235/40 is a bit tall and 235/35 is a bit short.
235/35 will "read" about 1.1% faster than a 245/35.
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