tire pressure for 255/40r17 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Breadman · 09-14-2018, 05:45 PM

im picking these up tomorrow and want to know what pressure i should be running them at. according to this chart https://www.toyotires.com/media/2125...s_20170203.pdf it says <26psi which seems way fucking low. if my math is right and it has the same contact patch size but just 40 mm wider i should be running somewhere around 29.5 psi

EndlessAzure · 09-14-2018, 06:10 PM

That's just for equivalent loading. You can run the same pressure as OE (35 psi) and be confident that the car can handle the same load with extra margin.

Also, if you run TMPS, the car is going to throw you a low tire pressure code anytime you're under 30 psi anyway.

The concept matches up whether you use P-Metric or ISO-Metric measurements

Breadman · 09-14-2018, 08:34 PM

Quote:

Originally Posted by EndlessAzure

That's just for equivalent loading. You can run the same pressure as OE (35 psi) and be confident that the car can handle the same load with extra margin.

Also, if you run TMPS, the car is going to throw you a low tire pressure code anytime you're under 30 psi anyway.

The concept matches up whether you use P-Metric or ISO-Metric measurements

wouldnt that mean it has the same size contact patch as 215s?

Leonardo · 09-14-2018, 08:56 PM

Quote:

Originally Posted by Breadman

wouldnt that mean it has the same size contact patch as 215s?

No.

stevesnj · 09-14-2018, 09:16 PM

I always use the pressure what's on the door sticker. Regardless of different tire size or brand. I never had any abnormal wear or any other issues.

09-14-2018, 05:45 PM	#1
Breadman Senior Member Join Date: Jul 2017 Drives: 2017 BRZ w/PP Location: Pa Posts: 1,027 Thanks: 51 Thanked 302 Times in 225 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	tire pressure for 255/40r17 im picking these up tomorrow and want to know what pressure i should be running them at. according to this chart https://www.toyotires.com/media/2125...s_20170203.pdf it says <26psi which seems way fucking low. if my math is right and it has the same contact patch size but just 40 mm wider i should be running somewhere around 29.5 psi

09-14-2018, 09:16 PM	#5
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	I always use the pressure what's on the door sticker. Regardless of different tire size or brand. I never had any abnormal wear or any other issues. __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

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