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      07-01-2012, 04:54 PM   #1
Kracken
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Anyone go beefier with a taller sidewall??

The m sport rear wheels are 245/35/18....Like to try a 45 for both front and rear when the time comes....Im guessing u plusher ride with the taller sidewall and still good handling depending on tire choice...
Anyone ever try 245/45/18's before? How do they fit and how does it handle/ride??
Thanks,
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      07-01-2012, 06:22 PM   #2
Clovef
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Your spedo would be way off and you would rub. Why would you want to do that? If you want more comfort get a 17 in rim.
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      07-02-2012, 09:01 AM   #3
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225/40/18 front and 255/35/18 rear is popular in this forum. Those sizes will give a noticeably softer ride. If you're also switching from OE runflats to non-runflat tires like Michelin PSS, that will also give a softer ride.
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      07-02-2012, 09:23 AM   #4
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Just going to non runflats in the original sizes will give you a more compliant ride.
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      07-02-2012, 10:00 AM   #5
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Quote:
Originally Posted by ulrichd View Post
Just going to non runflats in the original sizes will give you a more compliant ride.
+1 its night and day
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      07-02-2012, 01:55 PM   #6
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Quote:
Originally Posted by Clovef View Post
Your spedo would be way off and you would rub. Why would you want to do that? If you want more comfort get a 17 in rim.
wait... do you mean to say you have the only BMW with an accurate speedo?

Seriously, my main reason for going taller wasn't ride compliance, it was an accurate speedo. 235/45 in the rear has my car measuring darned accurate now. (Have a pair of 255/40, but couldn't fit them with the wheels I chose.)
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      07-02-2012, 08:49 PM   #7
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Sorry, I guess I was thinking big changes to make it larger then appropriate. I now understand what you are writing about.
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      07-02-2012, 10:44 PM   #8
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Well I have 225 40 17 front and 245 45 17 rear. But I guess thats because I am running 17's as opposed to 18's.
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      07-03-2012, 01:09 PM   #9
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Generally I don't recommend bumping up a tire profile, let alone two. It'll dramatically throw off your speedometer and the overall circumference and diameter of your wheel. Cross reference http://www.1010tires.com/TireSizeCalculator.asp and punch in the tire sizes. You'll see the overall diameter change and speedometer difference. You'll want it within 3% of your OEM sizes. If anything, I just recommend moving from run flats to non runflats. Like everyone stated, it's a night and day difference and I'm sure you'll be happy with the smoother ride. 245/45/18's would be huge on the 1-series.
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