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E89 Z4 (2009 - current)

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Old 03-23-2019, 09:24 AM
jmelong jmelong is offline
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Location: Tennessee
Join Date: Apr 2010
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Mein Auto: 2010 Z4 3.0
Tire question????

I have a 2010 Z4 3.0 with the Sport Package. It has 15000 miles and the original tires. Fronts are 225/40/18 and rear 255/35/18.

My question is twofold. Are the wheels the same front and rear? Second, I am tired of the noisy, rough ride of the Run Flats, so I am going with Non RFT's and probably Michelins. I really like to rotate my tires which I cannot do now. Can I put on tires, all the same size that would allow me to rotate? What size would I choose.

ALL suggestions and comments are appreciated.
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Old 03-24-2019, 11:25 AM
jparnes1 jparnes1 is offline
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Mein Auto: 2011 Z4 35i, 2006 525xi
Front wheels are 18x8, rears are 18x8.5. If you want to rotate, you have to get a square set up with 4 matching wheels. Then you can have 4 matching tires. And def a good idea to get off 9 year old tires.

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Old 05-20-2019, 04:46 PM
surfwooder surfwooder is offline
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Location: Bow, New Hampshire
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Mein Auto: 2009 BMW Z4

I agree about getting off those 9 year old tires. They probably look good, with enough thread, but internally they may have started to rot. Being on a Z4, alone which encourages some spirited driving, a tire failure could be tragic to say the least. As far as rotating tires on a Z4, I don't see a real need. The car is designed for equal weight on each wheel, and 4 wheel alignment. Buy new Michelins Sport tires, have the alignment checked or aligned. If you go non run flats you'll immediately notice the difference in ride and noise. We went non run flat on my wifes 328IC 2008 model and the change in ride comfort, and noise was astounding. But, you may want to invest in a jack, spare tire, and tools, and say goodby to what little trunk room you have. Or, travel around with no spare. Get a AAA membership for those flat tire days.
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Old 07-19-2019, 07:03 AM
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Leo-RochesterMI Leo-RochesterMI is offline
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I replaced my Potenzas for Michelin PS2s run flat, and I was absolutely delighted with the grip, comfort and noise improvements. However I must say, the steering sharpness, which was razor sharp like nomothetic car I ever driven, went way below what I would expect, or tolerate. And thereís also a wobbly behavior when changing directions or abrupt steering that is very unsettling. So, dynamics suck now. Iím burning those tires ($1400 a set) as fast as I can, and hope to replace them in the next 15k mi.
I love the comfort and noise though.

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Old 09-17-2019, 09:52 AM
scootr scootr is offline
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Mein Auto: 2010 E89 3.0 Stick shift
New guy here> Are the Michelin Pilot SS still the best warm climate wet and dry tire for non track use? New to me car has 17s on it. I'm looking at a square set up, maybe 18x8 wheels. Will I gain or loose ride comfort or performance with 18s?
Thank you in advance.
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Old 09-20-2019, 09:59 PM
scootr scootr is offline
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After a bit of study it's plain that the bigger the rim the shorter the sidewall and the shorter sidewalls are stiffer which produces a firmer if not harsher ride. I went with the best tire I could afford Michelin 4s in the stock size. Stock ride will be good enough for me and my old back.

Last edited by scootr; 09-20-2019 at 10:01 PM.
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