G30 Bigger tyres?

gasoline · 08-05-2023, 10:48 AM

Hi,
The tyre label for 19” tyres on G30 is
245/40 r19 front
275/35 r19 rear

Anyone using higher diameter tyre with 19” rims?
I am planing to use 245/45 r19 and 275/40 r19 (7 series size).
Total wheel diameter increases 1” compared to label

Any comment is appreciated.

ezaircon4jc · 08-05-2023, 01:35 PM

Your speedometer will be off. If your speedo shows 60mph, you'll be actually going a hair over 62. At an indicated 80, actual speed would be 83. I only used the front tire size.

https://tiresize.com/calculator/

gasoline · 08-05-2023, 03:23 PM

Quote:

Originally Posted by ezaircon4jc

Your speedometer will be off. If your speedo shows 60mph, you'll be actually going a hair over 62. At an indicated 80, actual speed would be 83. I only used the front tire size.

https://tiresize.com/calculator/

Thanks ezaircon4jc

Rocket455 · 08-18-2023, 12:49 PM

Quote:

Originally Posted by gasoline

Hi,
The tyre label for 19” tyres on G30 is
245/40 r19 front
275/35 r19 rear

Anyone using higher diameter tyre with 19” rims?
I am planing to use 245/45 r19 and 275/40 r19 (7 series size).
Total wheel diameter increases 1” compared to label

Any comment is appreciated.

I have a square setup on my M550i w/ 19's, running 245/45/19s since the past year. Specifically wanted a thicker sidewall for comfort and peace of mind.

https://g30.bimmerpost.com/forums/sh...ghlight=rohana

PaPaDrew G30 · 08-18-2023, 06:31 PM

285/35/19 and 255/40/19
Could go taller as well. There is room

Dasky_spas · 08-24-2023, 08:26 PM

I run much taller diameter on xdrive with no issue

245/35/20>>275/35/20
275/30/20>>275/35/20

Growler88 · 08-27-2023, 10:37 AM

Hi guys. Do you think I can switch 19” tires from stock 245/40/19 - 275/35/19 to 245/45/19 - 275/40/19? Don’t want to lower suspension, but don’t really like the extra space between wheel and arch. Thanks.

Growler88 · 08-27-2023, 10:38 AM

Quote:

Originally Posted by PaPaDrew G30

285/35/19 and 255/40/19
Could go taller as well. There is room

Nice, did You lower the suspension ?

08-05-2023, 10:48 AM	#1
gasoline Private 36 Rep 92 Posts Drives: 530i Xdrive Join Date: Dec 2022 Location: Ankara iTrader: (0)	G30 Bigger tyres? Hi, The tyre label for 19” tyres on G30 is 245/40 r19 front 275/35 r19 rear Anyone using higher diameter tyre with 19” rims? I am planing to use 245/45 r19 and 275/40 r19 (7 series size). Total wheel diameter increases 1” compared to label Any comment is appreciated. Last edited by gasoline; 08-05-2023 at 12:27 PM..
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08-05-2023, 01:35 PM	#2
ezaircon4jc Major General 4484 Rep 5,366 Posts Drives: 2019 540i M Sport Join Date: Jan 2015 Location: San Diego iTrader: (0)	Your speedometer will be off. If your speedo shows 60mph, you'll be actually going a hair over 62. At an indicated 80, actual speed would be 83. I only used the front tire size. https://tiresize.com/calculator/
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08-18-2023, 06:31 PM	#5
PaPaDrew G30 Enlisted Member 12 Rep 31 Posts Drives: 540i Join Date: Jul 2022 Location: VA iTrader: (0)	285/35/19 and 255/40/19 Could go taller as well. There is room Attached Images
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08-24-2023, 08:26 PM	#6
Dasky_spas Lieutenant 141 Rep 525 Posts Drives: Bmw Join Date: Mar 2023 Location: NYC iTrader: (0)	I run much taller diameter on xdrive with no issue 245/35/20>>275/35/20 275/30/20>>275/35/20
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08-27-2023, 10:37 AM	#7
Growler88 Registered 0 Rep 4 Posts Drives: 540i (G30) Join Date: Apr 2023 Location: USA iTrader: (0)	Hi guys. Do you think I can switch 19” tires from stock 245/40/19 - 275/35/19 to 245/45/19 - 275/40/19? Don’t want to lower suspension, but don’t really like the extra space between wheel and arch. Thanks.
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