Recommendations? Wish to install larger sidewall tires. 255/35R20 to 255/40R20

ttthan81 · 01-28-2021, 11:07 PM

I have a 2016 Alpina B6 and wish to install tires with a larger sidewall than what's at spec for my vehicle due to potholes and such. At spec, what is recommended are 255/35 20FR, and 285/30 20RR. However, I am considering 255/40 and 285/35, or even 265/40 and 295/35 if it is possible.

Can anyone recommend this setup? or will it just not work?

Thank in advance!

arucano · 01-29-2021, 06:01 PM

The important thing is making sure the circumferences are the same ratio as the OEM tires. If not, it will mess with your traction and stability control.
255/40/20 is 742 revolutions/mile
265/40/20 is 734 " "
255/35/20 is 770 " "

265/35/20 is 761 " "
295/35/20 is 740 " "
285/30/20 is 777 " "

ratio 1 - 0.975
ratio 2 - 0.9918
ratio 3 - 0.99099

ratio differences should be less than about 2% from what I remember

AccordTR · 01-29-2021, 07:58 PM

Quote:

Originally Posted by ttthan81

I have a 2016 Alpina B6 and wish to install tires with a larger sidewall than what's at spec for my vehicle due to potholes and such. At spec, what is recommended are 255/35 20FR, and 285/30 20RR. However, I am considering 255/40 and 285/35, or even 265/40 and 295/35 if it is possible.

Can anyone recommend this setup? or will it just not work?

Thank in advance!

Almost everyone I know had issues with their xDrive if they went wider than stock. Even keeping within the 1% xDrive rolling diameter always seems to cause some issue/bug. In the end we all stayed with the stock sizes and headaches went away.

Mck444 · 01-30-2021, 12:04 AM

Quote:

Originally Posted by AccordTR

Almost everyone I know had issues with their xDrive if they went wider than stock. Even keeping within the 1% xDrive rolling diameter always seems to cause some issue/bug. In the end we all stayed with the stock sizes and headaches went away.

Does this matter on a non x-drive? I currently have 275/35/20R and 245/30/20 F. I'm looking to move up to 295/305 is that possible?

AccordTR · 01-30-2021, 05:00 PM

Quote:

Originally Posted by Mck444

Quote:

Originally Posted by AccordTR

Almost everyone I know had issues with their xDrive if they went wider than stock. Even keeping within the 1% xDrive rolling diameter always seems to cause some issue/bug. In the end we all stayed with the stock sizes and headaches went away.

Does this matter on a non x-drive? I currently have 275/35/20R and 245/30/20 F. I'm looking to move up to 295/305 is that possible?

Non xDrive you can do basically anything you want. If it fits your rims, fenders etc go for it.

01-28-2021, 11:07 PM	#1
ttthan81 Registered 0 Rep 1 Posts Drives: 2016 BMW Alpina B6 Join Date: Dec 2019 Location: Littleton, CO iTrader: (0)	Recommendations? Wish to install larger sidewall tires. 255/35R20 to 255/40R20 I have a 2016 Alpina B6 and wish to install tires with a larger sidewall than what's at spec for my vehicle due to potholes and such. At spec, what is recommended are 255/35 20FR, and 285/30 20RR. However, I am considering 255/40 and 285/35, or even 265/40 and 295/35 if it is possible. Can anyone recommend this setup? or will it just not work? Thank in advance!
	Appreciate 0 Tweet Quote

01-29-2021, 06:01 PM	#2
arucano Captain 252 Rep 631 Posts Drives: 2014 M6 Grand Coupe CP Join Date: May 2017 Location: Kingwood TX iTrader: (0) Garage List 2014 BMW M6 GC [10.00]	The important thing is making sure the circumferences are the same ratio as the OEM tires. If not, it will mess with your traction and stability control. 255/40/20 is 742 revolutions/mile 265/40/20 is 734 " " 255/35/20 is 770 " " 265/35/20 is 761 " " 295/35/20 is 740 " " 285/30/20 is 777 " " ratio 1 - 0.975 ratio 2 - 0.9918 ratio 3 - 0.99099 ratio differences should be less than about 2% from what I remember __________________ F06 M6 Grand Coupe CP Sapphire Black Metallic The drive is the destination
	Appreciate 0 Quote