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  #1  
Old 04-25-2019, 07:26 AM
milton6x milton6x is offline
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80 yr. old grandpa ride

I have a 2007 coupe Z4 3.si that has non run flats and looking for a better ride . What are other's opinion about switching to smaller wheels with more tire for cushioning . Maybe off the non si Z4 or a Z3 . I would prefer 4 or 5 matching wheels to make it a true turing car . What should I be watching for on the used wheel market ?
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Old 04-25-2019, 07:31 AM
milton6x milton6x is offline
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Originally Posted by milton6x View Post
I have a 2007 coupe Z4 3.si that has non run flats and looking for a better ride . What are other's opinion about switching to smaller wheels with more tire for cushioning . Maybe off the non si Z4 or a Z3 . I would prefer 4 or 5 matching wheels to make it a true turing car . What should I be watching for on the used wheel market ?




"Life is one damned thing after another " U.S. Grant said it first
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Old 04-26-2019, 11:54 AM
keeton keeton is offline
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What wheels are on there now? The non-sport Si had 17" wheels all around while the sport option came with 18" with staggered widths front/rear.

The early 2.5 Z4s came with 16" wheels standard, and while you would be OK for bolt pattern and offset, I think the brakes on the later series Si were larger so you would definitely want to test fitment.

Even with 16" taller aspect ratio tires, you may get a little reduction in impact harshness but you are not going to get that "jet-smooth ride" (if you are old enough to recognize that advertising slogan )
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Old 04-26-2019, 01:14 PM
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ShakyDog ShakyDog is offline
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Mein Auto: Z4 3.0i
2007 Z4 Si US Coupes had style 203 wheels: 18x8 ET47, 18x8.5 ET50.

Only concern with a 17" is I know they have larger brake routers on the Si than the 3.0i. Mine has style 105 (17") wheels and I am not sure if the average person could tell a difference between 17 and 18.

http://www.bmwstylewheels.com/Z/Z4-E85+

Steve
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Old 04-26-2019, 01:22 PM
milton6x milton6x is offline
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Thanks for the responses . Looks like it would be better to leave it as designed .
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Old 04-26-2019, 08:45 PM
Andyz4 Andyz4 is offline
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Milton, I have an '06 Si with oem 17" wheels, so they will also fit your car. Besides the softer ride, I also prefer them over the staggered 18" setup (which was a factory option on my car), because I can rotate them front to rear for better wear.
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Old 04-29-2019, 07:52 AM
Z4530i Z4530i is online now
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Might want to check on the strut/shock and coil set up. A lot of options out there.
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Old 04-29-2019, 09:24 AM
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KevinC KevinC is offline
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Just ditching the runflats will smooth out the ride a LOT without downsizing to 17's. I did this on my E90 330i back in the day, and I could feel the difference before I even got out of the tire store's parking lot. Smoother ride, better handling, less unsprung weight. A complete win-win, other than the loss of runflat ability - but that's what a cellphone and AAA card are for anyways.
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Old 05-01-2019, 09:20 PM
Andyz4 Andyz4 is offline
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OP already stated he has non- runflats
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Old 05-04-2019, 01:34 PM
pokeybritches pokeybritches is offline
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Depending on your mileage, your shocks may need to be replaced. Worn shocks can reduce ride quality because the suspension is underdamped, and secondary movements/oscillations are introduced with large impacts.

Going to soft linear springs can improve ride quality over large bumps at the expense of NVH with small bumps and broken pavement. So, it depends on what part of the ride you want to improve, and what you are willing to sacrifice to improve it.


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Old 05-04-2019, 04:25 PM
milton6x milton6x is offline
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The coupe has 21,000 miles and non runflats . Most annoying is tar lines . Bigger bumps are taken with ease . The car gets very use , so it probably will not get any changes .


I just spotted the mispelling of touring on the original post , my very first mistake , ha ha .

Last edited by milton6x; 05-04-2019 at 06:02 PM.
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Old 05-04-2019, 04:37 PM
kptools kptools is offline
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Quote:
Originally Posted by milton6x View Post
The coupe has 21,000 miles and non runlets . Most annoying is tar lines . Bigger bumps are taken with ease . The car gets very use , so it probably will not get any changes .


I just spotted the mispelling of touring on the original post , my very first mistake , ha ha .
I just recently bought an 07 with 23k miles. By about 30k I noticed the ride getting noticeably worse and check the shocks. Rears were covered in oil. Shot, replaced them and the ride in much better. Take a look at them. Driving slowly didn't feel much different but any cornering really brought out the problem.
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