02-26-2024, 11:53 AM | #1 |
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Conti EFC 275 on apex 9.5
I'm getting ready to get stock up on tires for the season. Do you see any issues runnin a 275 EFC on an apex 9.5 wide rim for track purposes??
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02-26-2024, 01:17 PM | #2 |
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It won't provide optimum support, but it'll work ok
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02-26-2024, 02:53 PM | #3 |
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02-26-2024, 02:58 PM | #4 | |
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Quote:
A 275 on a 10.5 looks awfully happy as well. I suppose 9.5 in 275 is within tire spec, but if I can get some more support, better |
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02-26-2024, 04:28 PM | #5 |
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BMW is all over the place on tire sizes and wheel widths. Our f22 240ix has a 245 tire on an 8” wide wheel + a 225 on a 7” wide wheel, and on our g20 340ix it has a 255 tire on an 8.5” wide wheel + a 225 on an 8” wide wheel. The base f8x uses a 255 on a 9” wide wheel + a 275 on an 10” wide wheel, and, as you pointed out, the e9x M has a 265 on a 10” wide wheel + a 245 on a 9” wide wheel. For BMW, there is no correlation between tire size and wheel width! I would not use BMW as a definitive source on tire sizes and wheel widths
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02-27-2024, 05:00 AM | #6 |
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I've run 275/35R18 Conti ECFs on the front of my ATS-V with 18x9.5 wheels for two years now on circuit (295 rear on 10.5s), they do just fine. Did a 1:41.5 at Barber this past Saturday on a set of ECFs on the final lap of their 26th session.
I will note ECFs run a bit wide for size, so consider that if your fitment is close. FWIW, Cadillac's OE wheels for the ATSV are 9w with 255s front, 9.5w with 275s rear. |
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