Mixing tires with different speed index on xdrive

passanger · 03-31-2021, 08:29 AM

Hi floks,

Is it ok to mix speed ratings on xdrive (f36 428)?
In my country i cannot find summer tires that i want with same speed index, the tires i've found are 225/40 19 W93, and 255/35 19 Y96.
I've read many article about this, and it's still not clear to me, i always had tires with the same speed index.

Does anyone have experience with this, or should i try to find tires with same speed index front/back?

Thanks

frchdragon · 03-31-2021, 08:57 AM

W index is 270 kph
Y index is 300 kph

Except if you are planning on going above 270kph, I think you are safe.
Stick to the same tire brand and model for front and back and you will be fine.

03-31-2021, 08:29 AM	#1
passanger New Member 10 Rep 20 Posts Drives: Bmw f36 428i xDrive Join Date: Jun 2020 Location: Belgrade iTrader: (0)	Mixing tires with different speed index on xdrive Hi floks, Is it ok to mix speed ratings on xdrive (f36 428)? In my country i cannot find summer tires that i want with same speed index, the tires i've found are 225/40 19 W93, and 255/35 19 Y96. I've read many article about this, and it's still not clear to me, i always had tires with the same speed index. Does anyone have experience with this, or should i try to find tires with same speed index front/back? Thanks
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03-31-2021, 08:57 AM	#2
frchdragon Lieutenant 338 Rep 417 Posts Drives: 2016 BMW M4 Join Date: Feb 2021 Location: ON, Canada iTrader: (0)	W index is 270 kph Y index is 300 kph Except if you are planning on going above 270kph, I think you are safe. Stick to the same tire brand and model for front and back and you will be fine. __________________ '16 M4 bone stock '13 335ix Msport BM3 stage1 - MAD FMI - FTP CP - Bilstein B4 (SOLD) '85 635csi M30 turbo race car (SOLD)
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