F32 440i Tyre Sizes

B58guy · 10-13-2020, 09:18 AM

I currently own a 2017 440i Coupe, my current tyre sizes on the 442m 19" wheels are:

Front 225/40/R19
Rear 255/35/R19

What would be the best tyre sizes to get?

Thanks in advance

BWbimmer · 10-13-2020, 10:49 AM

Is there a problem with your tire size?

jmack · 10-13-2020, 12:10 PM

255 is already the largest width that some chain tire shops will put on a 8.5" wheel. That said, 275/30 will usually fit on a 8.5 safely, and 235/35 on the fronts will give you equal diameter.

B58guy · 10-13-2020, 01:22 PM

Quote:

Originally Posted by jmack

255 is already the largest width that some chain tire shops will put on a 8.5" wheel. That said, 275/30 will usually fit on a 8.5 safely, and 235/35 on the fronts will give you equal diameter.

Would you say there is a benefit to this?

jmack · 10-13-2020, 02:15 PM

Quote:

Originally Posted by shak_il

Would you say there is a benefit to this?

Depends how hard you drive and if you're experiencing wheel spin and/or under steer with the stock sizes. If you're driving at the limit you'll have a bit more traction at the front during turn in, and better hookup at the rear.

For normal driving, no benefit at all, plus increased costs of tires at those sizes.

HarryTee · 10-13-2020, 02:24 PM

People consider changing tyre size usually because they change to different wheels. In your case, the justification usually is just for the looks (I'm not sure if this is what you're after).

alohasurftoad · 10-14-2020, 12:34 AM

255/35/19 is the max width for 19x8.5" rear, so leave it.

swap the 225/40/19 up front, to 245/35/19, to reduce understeer.

here are some pics of the said swap.

BWbimmer · 10-14-2020, 02:45 AM

Quote:

Originally Posted by shak_il

Would you say there is a benefit to this?

Wider tires always benefit the traction, but I'm still not sure what you are after?
For someone not pushing the car, you got exatly the right tires

HarryTee · 10-14-2020, 03:04 AM

We all want benefit but don't forget also the cost: wider tyres increase fuel consumption and hurt the speed (not to mention the increase cost of the tyres).

B58guy · 11-10-2020, 08:42 PM

Thank you for all the advice went for the standard sizes in PS 4S's

AspektUSA · 11-10-2020, 08:48 PM

According to an actual race car driver, your tire should 0.5" narrower than your wheel size.

https://motoiq.com/how-to-properly-s...r-performance/

You need to match this measurement:

10-13-2020, 09:18 AM	#1
B58guy Private 14 Rep 53 Posts Drives: . Join Date: Oct 2017 Location: London iTrader: (0)	F32 440i Tyre Sizes I currently own a 2017 440i Coupe, my current tyre sizes on the 442m 19" wheels are: Front 225/40/R19 Rear 255/35/R19 What would be the best tyre sizes to get? Thanks in advance
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10-13-2020, 10:49 AM	#2
BWbimmer Captain 277 Rep 833 Posts Drives: BMW F36, E36, E93 Join Date: Jul 2019 Location: Germany iTrader: (0) Garage List 08/2017 440i GC MPPSK [0.00]	Is there a problem with your tire size? __________________ Such Fun If you finde any spelling mistakes in my posts you may keep them, no return required
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10-13-2020, 12:10 PM	#3
jmack First Lieutenant 549 Rep 384 Posts Drives: OG M2, E70 X5M Join Date: Oct 2018 Location: TN iTrader: (0)	255 is already the largest width that some chain tire shops will put on a 8.5" wheel. That said, 275/30 will usually fit on a 8.5 safely, and 235/35 on the fronts will give you equal diameter.
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10-13-2020, 02:24 PM	#6
HarryTee Lieutenant 214 Rep 496 Posts Drives: 2020 M4CP & 2017 440i GC Join Date: Jan 2020 Location: UK iTrader: (0)	People consider changing tyre size usually because they change to different wheels. In your case, the justification usually is just for the looks (I'm not sure if this is what you're after).
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10-14-2020, 12:34 AM	#7
alohasurftoad Brigadier General 3080 Rep 4,330 Posts Drives: 440i gran coupe w/mppsk Join Date: Apr 2015 Location: hawaii iTrader: (0)	255/35/19 is the max width for 19x8.5" rear, so leave it. swap the 225/40/19 up front, to 245/35/19, to reduce understeer. here are some pics of the said swap. Attached Images
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10-14-2020, 03:04 AM	#9
HarryTee Lieutenant 214 Rep 496 Posts Drives: 2020 M4CP & 2017 440i GC Join Date: Jan 2020 Location: UK iTrader: (0)	We all want benefit but don't forget also the cost: wider tyres increase fuel consumption and hurt the speed (not to mention the increase cost of the tyres).
	Appreciate 1 BWbimmer276.50 Quote

11-10-2020, 08:42 PM	#10
B58guy Private 14 Rep 53 Posts Drives: . Join Date: Oct 2017 Location: London iTrader: (0)	Thank you for all the advice went for the standard sizes in PS 4S's
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11-10-2020, 08:48 PM	#11
AspektUSA Lieutenant 271 Rep 495 Posts Drives: 340i MSport/THP Join Date: Dec 2018 Location: Denver iTrader: (0)	According to an actual race car driver, your tire should 0.5" narrower than your wheel size. https://motoiq.com/how-to-properly-s...r-performance/ You need to match this measurement:
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