225/45 R17 vs 225/40 R18 wheels - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 04-10-2009, 02:48 AM
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225/45 R17 vs 225/40 R18 wheels

I want to put on my '95 E36 320i Coupe either 225/45 R17 or 225/40 R18 wheels with the same alloy rim and tire brands and model. Both sizes I like very much how look on E36, with a plus for 18 inch wheel. I know that only 225/45 R17 is a OEM size (see realoem.com). I want to know from your experience advantages and disadvantages for both wheel sizes, including fuel consumption, loading on engine and transmission, agility, steering response, etc. In theory I know how things work, but you know that in practise could be different!!!
Thank you E36 fans!
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#2 (permalink) Old 04-10-2009, 10:57 AM
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I would not reccomend using a 40 series tire. I have 225/45/17's on my E36. They give a firm ride with good grip.

If you drop to a 40 series tire, you will loose some of the flexibilty in the side wall and this will affect ride quality. Added to this, the smaller side wall height makes it far easier for you to damage the wheels when you hit a hole in the road or the kerb.

225/45/17's should be cheaper as well as they are a more common size.

Have fun.

Aim low, play Bass!
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