21" Tire Pressures

utmiken · 10-18-2013, 12:22 AM

Could those of you running 21" tires please share what pressures you are using? I'm trying at 35psi but it seems kinda low.

utmiken · 10-21-2013, 10:39 PM

I'm running the same size tires. How did you come up with that pressure. I asked the wheels guys and they said go factory recommendation still. Some people are running 38PSI.

Vic55 · 10-22-2013, 12:55 PM

I dont think there is an exact science to it--- since its a plus one tire size I think oem pressures are not as relative. Most of the tire and wheel guys I know that deal with plus sizes say you should take the factory pressure and add 1 psi per inch of diameter increase. But road conditions should also play a role in your decision.

I run a plus 1 psi on each of my wheels on my Porsche (21 inch set vs 20 inch factory) and I have very good roads where I live.

utmiken · 10-22-2013, 07:42 PM

Quote:

Originally Posted by Pertplus

Quote:

Originally Posted by utmiken

I'm running the same size tires. How did you come up with that pressure. I asked the wheels guys and they said go factory recommendation still. Some people are running 38PSI.

Wheel Enhancement in Culver City who installs my wheels/tires and is the West Coast Distributor for HRE. I also have a magic 8-ball.

My magic 8 ball told me not to buy wheels......I did not listen. I blame everyone on this forum and their nice wheels.

SSR · 10-25-2013, 10:58 PM

38-40 cold is ok

10-18-2013, 12:22 AM	#1
utmiken Private First Class 15 Rep 117 Posts Drives: F10 M5 Join Date: Nov 2012 Location: Sugar Land, TX iTrader: (1)	21" Tire Pressures Could those of you running 21" tires please share what pressures you are using? I'm trying at 35psi but it seems kinda low.
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10-21-2013, 10:39 PM	#2
utmiken Private First Class 15 Rep 117 Posts Drives: F10 M5 Join Date: Nov 2012 Location: Sugar Land, TX iTrader: (1)	I'm running the same size tires. How did you come up with that pressure. I asked the wheels guys and they said go factory recommendation still. Some people are running 38PSI.
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10-22-2013, 12:55 PM	#3
Vic55 Lieutenant General 19319 Rep 10,161 Posts Drives: 2023 BMW M8 Competition Coupe Join Date: Jul 2009 Location: THE Orange County iTrader: (9)	I dont think there is an exact science to it--- since its a plus one tire size I think oem pressures are not as relative. Most of the tire and wheel guys I know that deal with plus sizes say you should take the factory pressure and add 1 psi per inch of diameter increase. But road conditions should also play a role in your decision. I run a plus 1 psi on each of my wheels on my Porsche (21 inch set vs 20 inch factory) and I have very good roads where I live. __________________ 2024 BMW M3 CS Frozen Solid White 2023 BMW M8 Coupe Competition Alpine White 2022 Porsche Carrera GTS Coupe Shark Blue 2020 Audi R8 V10 Performance Suzuka Gray 2012 Mercedes Benz C63 AMG Black Series Obsidian Black
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10-25-2013, 10:58 PM	#5
SSR Private 6 Rep 76 Posts Drives: F10 m5 Join Date: Oct 2012 Location: America iTrader: (0)	38-40 cold is ok
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