12-27-2012, 09:25 AM | #1 |
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Tire sizing question ?
Hello,
My OEMS on my 2011 28i are 245/55/R-17 . Came across a set of Winter tires and Tirerack sports wheels of size 235/RR/R-17. The only difference I see is in treadwidth . Using http://www.1010tires.com/tiresizecal...?action=submit revealed Revs per Mile: 753.3 on 245/55/R-17 Revs per Mile: 765.5 on 235/55/R-17. ----------- Do i need to be concerned? Appreciate any input. Thanks |
12-27-2012, 10:29 AM | #2 | |
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tire will look small in the wheel arch so better stick to oem size or go taller by 5pct using 235/60 |
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12-27-2012, 06:48 PM | #3 |
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To answer your specfic question - there should be no problems in using 235/55/17s in place of 245/55/17s. There is only a 1.6% difference in tire overall diameter (27.6" for the OEM tire vs 27.2" for the replacement). Only issue will be your speedo will read 1.6% high - ie when speedo shows 60 mph, you actually will only be going approx 59 mph.
The alternative suggested by DC will also work. I know because thats the tire size I replaced my original OEM 245/55/17s with when I took delivery of our X3 over 12 months ago. For the 235/60/17s, tire diameter is 28.1" or 1.8% larger than the OEM size (in this case the speedo reads 1.8% low). One other alternative which will let you keep the BMW OEM tire diameter is 225/60/17 (tire OD = 27.6"). Tony |
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12-28-2012, 03:25 PM | #4 |
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Yes but we need to remember that usually speedometers do not show real speed (go faster) so increasing the diameter will bring us to actual speeds
Have seen x3 with a f10 M5 wheels and 255/40/20 tires that is .... something Sorry not 17" |
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12-29-2012, 02:39 PM | #5 | |
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