Optimum Tire Size for 18.5” Wheels

sav_e92 · 03-25-2020, 09:37 PM

I have 18x8.5 VMR V710s on my e92 328xi with 225/40/18 tires (square setup). Would I gain any benefit from using wider tires on the rear such as 255/35/18 or wider all around? Seems like 225 is a bit narrow for these wheels.

I bought the car recently and it has almost new Michelin PSS tires so won’t be replacing for a while but would like to know for future reference.

Antetokounmpo · 03-26-2020, 09:55 AM

255/35/18 square is pretty popular. Overall, you'll just have more grip.

sav_e92 · 03-27-2020, 09:16 AM

Thanks - that's what I figured, but wasn't sure if there is an advantage to having narrower tires in the front despite having the wheel width to accommodate a wider tire. Sounds like that's a no.

Antetokounmpo · 03-27-2020, 10:08 AM

Quote:

Originally Posted by SAVAGE_VT_E92

Thanks - that's what I figured, but wasn't sure if there is an advantage to having narrower tires in the front despite having the wheel width to accommodate a wider tire. Sounds like that's a no.

Opposite actually, the cars understeer a lot from factory like every car, and running wider rears just exacerbate that.

Soravia · 03-27-2020, 11:09 AM

You can have more grip with sticky rubber like Bridgestone Potenza S-04 Pole Position. I have them in 235 and plenty of rubber.

sav_e92 · 03-29-2020, 11:55 AM

Thanks for the tips everyone. I’ll go for some wider rubber down the road when it’s time to replace the PSSs.

03-25-2020, 09:37 PM	#1
sav_e92 Private First Class 34 Rep 112 Posts Drives: ‘07 328xi Coupe Join Date: Mar 2020 Location: New England iTrader: (0)	Optimum Tire Size for 18.5” Wheels I have 18x8.5 VMR V710s on my e92 328xi with 225/40/18 tires (square setup). Would I gain any benefit from using wider tires on the rear such as 255/35/18 or wider all around? Seems like 225 is a bit narrow for these wheels. I bought the car recently and it has almost new Michelin PSS tires so won’t be replacing for a while but would like to know for future reference.
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03-26-2020, 09:55 AM	#2
Antetokounmpo Brigadier General 1560 Rep 3,475 Posts Drives: E90 6MT FBO; '18 F150 Platinum Join Date: Jul 2013 Location: WI iTrader: (3) Garage List 2018 Ford F-150 Pla ... [0.00] 2008 BMW 335xi [0.00]	255/35/18 square is pretty popular. Overall, you'll just have more grip. __________________ 2008 335xi 6MT \| VRSF Catless DP \| VRSF 7" FMIC \| VRSF CP \| TIAL BOV \| DCI \| MHD 2+ BC Racing BR \| Stoptech 600 \| Firehawk Indy 500 255 Square \| Atric Altimax 225 Sq. 2018 F-150 Platinum 701A \| FX4 \| 3.5 EcoBeast
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03-27-2020, 09:16 AM	#3
sav_e92 Private First Class 34 Rep 112 Posts Drives: ‘07 328xi Coupe Join Date: Mar 2020 Location: New England iTrader: (0)	Thanks - that's what I figured, but wasn't sure if there is an advantage to having narrower tires in the front despite having the wheel width to accommodate a wider tire. Sounds like that's a no.
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03-27-2020, 11:09 AM	#5
Soravia Captain 117 Rep 598 Posts Drives: 2011 E91 Silver xDrive 6MT Join Date: Apr 2013 Location: Kentucky iTrader: (0)	You can have more grip with sticky rubber like Bridgestone Potenza S-04 Pole Position. I have them in 235 and plenty of rubber.
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03-29-2020, 11:55 AM	#6
sav_e92 Private First Class 34 Rep 112 Posts Drives: ‘07 328xi Coupe Join Date: Mar 2020 Location: New England iTrader: (0)	Thanks for the tips everyone. I’ll go for some wider rubber down the road when it’s time to replace the PSSs.
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