Non runflat tyre sizes - implications?

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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del_tl1000r
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Non runflat tyre sizes - implications?

Post by del_tl1000r » Fri Jul 12, 2019 3:49 pm

The fronts overall diameter that you have is 647mm. A difference of 13mm over stock which will make the car around 6mm taller at the front. The tyres fill the arches better though with the 19s rather than the 17s.
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Non runflat tyre sizes - implications?

Post by ZedConvert » Fri Jul 12, 2019 4:17 pm

del_tl1000r, gap between tyre and arch seems quite a bit more than your set up, surprising considering my tyre dimensions and the std suspension.

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Non runflat tyre sizes - implications?

Post by del_tl1000r » Fri Jul 12, 2019 4:36 pm

I see what you mean. Is your driveway perfectly flat as mine isn't and the car sits a bit weird on it? One side can look as though the car is high and the other side looks like it has been lowered
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Non runflat tyre sizes - implications?

Post by del_tl1000r » Fri Jul 12, 2019 4:40 pm

viewtopic.php?f=23&t=109399&start=15

Check out my before and after pics here and see what you think.
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Non runflat tyre sizes - implications?

Post by del_tl1000r » Fri Jul 12, 2019 4:50 pm

23i
Msport seats
CDV deleted
LED halo bulbs
LCI side repeaters
Stubby
Brushed stainless exhaust tips
Focal speakers
Pioneer amp
Kicker sub
M4 style wheels

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Non runflat tyre sizes - implications?

Post by ZedConvert » Fri Jul 12, 2019 4:57 pm

del_tl1000r, yeah it's the same both sides.

I can literally fit three fingers in width between the tyre and arch...
EF9910B1-6AAB-466E-9746-2A4BA848106F.jpeg
EF9910B1-6AAB-466E-9746-2A4BA848106F.jpeg (329.52 KiB) Viewed 117 times

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Non runflat tyre sizes - implications?

Post by del_tl1000r » Fri Jul 12, 2019 5:07 pm

I'm at work just now but I'll check when I leave and take pics. I'll use the finger method. I take it that's the gap at the top of the arch?
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Non runflat tyre sizes - implications?

Post by ZedConvert » Fri Jul 12, 2019 5:11 pm

del_tl1000r, yep, also known as 5.5cm :rofl:

Seems pretty much the same all round...

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Non runflat tyre sizes - implications?

Post by del_tl1000r » Fri Jul 12, 2019 8:03 pm

20190712_190640.jpg
20190712_190640.jpg (68.13 KiB) Viewed 105 times
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20190712_190652.jpg (75.08 KiB) Viewed 105 times
20190712_190626.jpg
20190712_190626.jpg (188.29 KiB) Viewed 105 times
Took a measurement from road to wheel arch

Front = 680
Rear = 676
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Non runflat tyre sizes - implications?

Post by Nictrix » Fri Jul 12, 2019 10:44 pm

ZedConvert wrote:
Fri Jul 12, 2019 4:57 pm
del_tl1000r, yeah it's the same both sides.

I can literally fit three fingers in width between the tyre and arch...

EF9910B1-6AAB-466E-9746-2A4BA848106F.jpeg
Is that the drivers side rear?
Is your tyre on the wrong side?
E89 2010 23i M Sport Black with Black leather

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Non runflat tyre sizes - implications?

Post by ZedConvert » Fri Jul 12, 2019 11:04 pm

Nictrix, yeah that's the drivers side rear, it's a staggered set up.

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Non runflat tyre sizes - implications?

Post by Nictrix » Fri Jul 12, 2019 11:05 pm

ZedConvert wrote:
Fri Jul 12, 2019 11:04 pm
Nictrix, yeah that's the drivers side rear, it's a staggered set up.
Its a rotational tyre thats facing the wrong direction.
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Non runflat tyre sizes - implications?

Post by ZedConvert » Fri Jul 12, 2019 11:12 pm

Nictrix, ah you spotted the deliberate mistake... even BMW didn't notice today, and they were all over the wheels.

Lesson learned... take your time!

Call me novice... But don't see how this will affect the gap between arch and tyre.

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Non runflat tyre sizes - implications?

Post by Nictrix » Fri Jul 12, 2019 11:24 pm

ZedConvert wrote:
Fri Jul 12, 2019 11:12 pm
Nictrix, ah you spotted the deliberate mistake... even BMW didn't notice today, and they were all over the wheels.

Lesson learned... take your time!

Call me novice... But don't see how this will affect the gap between arch and tyre.
It wont affect the gap at all, I just thought you might want to know your tyres were on wrong.
Does it drive better in reverse? :lol:
E89 2010 23i M Sport Black with Black leather

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Non runflat tyre sizes - implications?

Post by ZedConvert » Fri Jul 12, 2019 11:26 pm

Nictrix, yeah and the funny thing is... It flew through the MOT last week with BMW- I'm not the only stupid one :rofl: :headbang:

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