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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Performance loss after wide tire install?



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      03-23-2009, 10:13 PM   #1
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Performance loss after wide tire install?

I previously had 225/40/16 Blizzak WS 60 on my e90, the drive was harsh because of run flats and the steering wheel was smooth.
This weekend i switched over to 19" privat gassens running et 40 up front on 235/30/19 and et 25 rear with 265/35/19 I believe. FIrst thing I noticed was the immediate change in handling, the car was much smoother even with 19" wheels and quieter. However, I felt a slower acceleration. Is it just me? Am I feeling this way because of the smoother drive? Or do wide rear tires affect acceleration.
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      03-24-2009, 12:26 AM   #2
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The mass is further from the center due to the increased diameter, and there is more mass at the rim due to the width. That makes the wheel harder to spin, which means slower acceleration.
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      03-24-2009, 12:44 AM   #3
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And more contact patch more rolling resistance.
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      03-24-2009, 03:56 AM   #4
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Quote:
Originally Posted by chesterfan1230 View Post
I previously had 225/40/16 Blizzak WS 60 on my e90, the drive was harsh because of run flats and the steering wheel was smooth.
This weekend i switched over to 19" privat gassens running et 40 up front on 235/30/19 and et 25 rear with 265/35/19 I believe. FIrst thing I noticed was the immediate change in handling, the car was much smoother even with 19" wheels and quieter. However, I felt a slower acceleration. Is it just me? Am I feeling this way because of the smoother drive? Or do wide rear tires affect acceleration.
I felt it slower with 19s too. I also feel that it takes longer to break.


slower acceleration may also be caused by heavier rims? or newer tires with more tread is slower than older tires? Can someone confirm?
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      03-24-2009, 05:58 AM   #5
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Sounds like you may have gone with heavier rims. Not necessarily wide tires causing that problem. For most, 19 inch non-RF tires are actually lighter than RF's.
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      03-24-2009, 11:47 AM   #6
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This is just an example of the assumption a lot of people have that larger rims = faster car. Acceleration is your car's ability to overcome inertia. Heavier rims = more inertia. Without engine mods, heavier rims = slower acceleration.

Almost always, having larger rims adds weight for the same overall diameter, wheel + tire. Tires are hollow so they contribute less weight than the rim.

Similarly, heavier rims resist impact deflection more so your tires must absorb more pounding. With a lower profile sidewall, you need to run higher air pressure to protect your rims.
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      03-24-2009, 11:49 AM   #7
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yes, larger and/or heavier rims will negatively affect both acceleration and braking. it's a physics thing.

considering you increased the size of your rear tires by 3.2 inches over the previous setup, that is going to have a pretty large impact on your effective gearing. It's like running a taller rear end gear (lower numerically), which is not good for performance.
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      03-24-2009, 09:14 PM   #8
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well the wheels i have now are much lighter than the my current setup. But yes, the wheels have definitely decreased my performance.
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      03-24-2009, 09:47 PM   #9
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Wider tires affect performance. Less surface area contact leads to decreased friction and consequently more performance.
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      03-25-2009, 01:20 AM   #10
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hmm, that must mean we should change our 19s into these..

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      03-25-2009, 03:02 AM   #11
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what tyre pressure are you running?
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      03-25-2009, 08:30 AM   #12
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      03-25-2009, 09:34 AM   #13
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Check weight b4 buying

Tirerack has weight numbers for almost every tire and wheel they sell. Why doesn't anyone check the weights before buying? As noted earlier in this post a few pounds heavier wheel makes a big difference when you have to spin it. Especially for braking. It not the same affect as carrying the same amount of extra weight in your trunk!

BMW recommends 17 or 18 inch wheels on our cars, anything bigger you are sacraficing performance.
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      03-25-2009, 07:30 PM   #14
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265 is a lot of tyre for the rear wheel to drive.. If you're running 35psi cold, try higher pressure and see if it helps without the ride become too hash. Try 38psi or even up to 40psi cold.
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      03-25-2009, 07:59 PM   #15
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      03-25-2009, 08:33 PM   #16
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The wheel weight is lower, and certainly the tire weight is lower. The issue is "effective gearing". Your new set up yields a rear tire that is more than 3 inches larger in diameter; this is the culprit. Overall outside tire diameter should stay about the same when adding new wheel/tire combo's. See the Tire Rack calculator at the top of all wheel/tire pages.

Quote:
Originally Posted by chesterfan1230 View Post
I previously had 225/40/16 Blizzak WS 60 on my e90, the drive was harsh because of run flats and the steering wheel was smooth.
This weekend i switched over to 19" privat gassens running et 40 up front on 235/30/19 and et 25 rear with 265/35/19 I believe. FIrst thing I noticed was the immediate change in handling, the car was much smoother even with 19" wheels and quieter. However, I felt a slower acceleration. Is it just me? Am I feeling this way because of the smoother drive? Or do wide rear tires affect acceleration.
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      03-25-2009, 10:01 PM   #17
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holy crap.. that's a big difference.. I just assume people know they need to keep the rolling diameter the same. There you go, your gearing is way too tall and speedo is out.

doesn't quite make senses though? are you sure the standard tyre are 225/40 and not 225/45? going by the calculator you need a profile of less than 25!
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