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E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm}


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Old Wed, May-25-2011, 12:54:05 AM   #1
nickdrivesm3
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Default Has anyone experimented with 265/30s instead of 265/35s?

Due to an AutoX last weekend that I had WAY too much fun at, I had to replace my rear tires ASAP and the only tire place that had a 265/19 was San Diego Wheel/Tire. The only size they had was 265/30/19. (Federal something something, didn't really care)

Anyway, has anyone noticed with the 30 series sidewall how much different the rear end feels? My traction control has been kicking in A LOT more in turns than the last set of tires and I think its because the lack of sidewall. Just curious to see if anyone else has had this experience.

TIA

btw, pic of old tires...

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Old Wed, May-25-2011, 07:46:04 AM   #2
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

I'm running Hankook V12s 285/30/19 in the rear with no issues at all. The car feels a little quicker though.
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Old Wed, May-25-2011, 09:15:45 AM   #3
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

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I'm running Hankook V12s 285/30/19 in the rear with no issues at all. The car feels a little quicker though.
me too!

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Old Wed, May-25-2011, 03:02:21 PM   #4
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

I would suspect the extra DSC fun is the result of two things:
1) crappy tires without as much grip, meaning the tires slip more often so DSC is needed more often
2) The car is expecting a certain rotational speed difference between the front and rear tires. Because you've gone to a smaller tire in the rear but not in the front, the car is not seeing the tire size it expects. From the car's perspective, this is caused by wheel slip... so it's already closer to its threshold of DSC intervention. Less real slip is needed to push it over that line,
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Old Wed, May-25-2011, 03:16:01 PM   #5
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

^What he said

They still may be broken in but most Federal tires cannot compare to PS2's except maybe the 595RS-R which does have comparable dry traction. I'm guessing they still need to be broken in and/or you don't have 595RS-R's but some lower performance variant.
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Old Wed, May-25-2011, 03:37:50 PM   #6
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

I would think a BMW Master Technician would know this. You changed the difference in overall diameter between the front and the rear tires. You need to keep this difference as close to OEM or you will affect the way the wheel speed sensors and DSC work. Since you went smaller diameter in the front you decreased the difference which will make DSC think that the rear wheels are spinning sooner. If you were to increase the difference the opposite would occur. By the way I ran 265/30s for a short time on my E92 M3, and DSC would disengage cruise control when going down a hill at 65 mph because it thought the rear tires were spinning.
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Old Wed, May-25-2011, 07:00:07 PM   #7
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

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I would think a BMW Master Technician would know this. You changed the difference in overall diameter between the front and the rear tires. You need to keep this difference as close to OEM or you will affect the way the wheel speed sensors and DSC work. Since you went smaller diameter in the front you decreased the difference which will make DSC think that the rear wheels are spinning sooner. If you were to increase the difference the opposite would occur. By the way I ran 265/30s for a short time on my E92 M3, and DSC would disengage cruise control when going down a hill at 65 mph because it thought the rear tires were spinning.
You're forgetting he is also the president of SD BMWCCA.
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Old Wed, May-25-2011, 10:46:34 PM   #8
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

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Old Thu, May-26-2011, 12:32:59 AM   #9
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

lol, ok I'll allow a few jabs in here because I'm a tech asking for EXPERIENCES, not why this is happening. haha

For the record, I'm still getting used to this car and I'm coming from an e36 M3 of 7 years so I wouldn't think this would be a big deal. However, this car seems to be sensitive to a smaller sidewall in the rear. Noted.
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Old Thu, May-26-2011, 12:47:30 AM   #10
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Default Re: Has anyone experimented with 265/30s instead of 265/35s?

Yea.. DSC is pretty precise. Just another caveat of cars getting more and more technologically advanced.
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Discussing Has anyone experimented with 265/30s instead of 265/35s? in the E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) Forum - {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm} at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)