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Old 11-15-2001, 01:37 AM   #1
Scooby Specialist
Member#: 7768
Join Date: Jun 2001
Location: bay area, C A L I
Default 18" rim owners look here!!

whats the correct tire pressure for 18" 215/40/18? anyone help me out please?
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Old 11-15-2001, 02:18 AM   #2
Friendly Neighbourhood
Member#: 269
Join Date: Sep 1999
Chapter/Region: VIC
Location: Burnaby, B.C., Canada
00 Impreza RS GM6 RIP

Default The correct tire pressure...

is located in your owners manual as well as your door jamb.

Click here for more info. Even though its for 17" wheels, it'll still work for 18" wheels.

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Old 11-15-2001, 02:26 AM   #3
Scooby Specialist
Member#: 1911
Join Date: Jul 2000
Location: Seattle, WA, USA
2000 Impreza 2.5RS
Silverthorn Metallic


The owner's manual isn't much help for aftermarket wheels. Did you read the manufacturer's recommendations or even the side of the tire?

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Old 11-15-2001, 02:28 AM   #4
Eric SS
Sooby Guru
Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2014 Q60S, 2016 Chevy SS
2000 2.5RS w/ EJ22T
swap and N20. gone. : (


What do you want ot do with the car? on the street I usually run about 34-35psi hot and when autocrossing I run about 40-43psi hot
All tires are about the same though. Within reason, the higher the pressure, the better the gas milage but the worse the ride comfort. The lower the pressure (again, within reason) the better ride comfort but the worse the gas milage

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Old 11-15-2001, 02:55 AM   #5
Friendly Neighbourhood
Member#: 269
Join Date: Sep 1999
Chapter/Region: VIC
Location: Burnaby, B.C., Canada
00 Impreza RS GM6 RIP


If you're unsure of what tire pressure to run, as long as the vehicle manufacture's recommended pressure (i.e. the ones stated on the door jamb and owners manual) fall within the allowable tolerances of a particular tire, I'd start with that. From then on, you can bump it up or down depending on your preference.

There have been alot of newbies asking basically the same question, hence they get basically the same answer from me.

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Old 11-15-2001, 10:41 AM   #6
Scooby Newbie
Member#: 5987
Join Date: Apr 2001
Chapter/Region: SCIC
Location: Irvine,CA
2002 WRX
Platinum Silver Metallic


I usually run mine 35-40 psi.
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Old 11-15-2001, 10:45 AM   #7
Scooby Specialist
Member#: 1575
Join Date: Jun 2000
Chapter/Region: South East
Location: Atlanta GA, USA
2011 WRX Premium
Blackest Black

Default Tire pressure trick!

We used to do this in the 4x4 world where premature or uneven tire wear was a real pain and happened all the time.

1) find a empty cul-de-sac or dead end road

2) draw a chalk line across the tread of each tire

3) drive down the road for a few hundred feet then stop

4a) if the chalk wore off in the middle first add air pressure
4b) if the chalk wore off on the outside and inside edges reduce pressure

5) repeat until chalk wears off evenly for all 4 wheels

BINGO that is your ideal pressure. Typically it will be higher in the front than the rear and for some cars it is different for each wheel. Remember this is the best pressure for even tire wear. For track/autocross adjustments are better made for traction reasons.
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