Tyre pressure for 18in wheel?
06 March 2018, 05:25 AM
#1
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Thread Starter
Tyre pressure for 18in wheel?
Good morning all.
I was just wondering what tyre pressure people are using with 18inch wheels.
Have gone for 34 on the front and 32on the back. Tyres are 225 /40r18
I was just wondering what tyre pressure people are using with 18inch wheels.
Have gone for 34 on the front and 32on the back. Tyres are 225 /40r18
06 March 2018, 09:19 AM
#2
Scooby Regular
What does your owners manual/handbook recommend (for 17's)? Use those figures. (have seen listed as 36/30 )
06 March 2018, 01:01 PM
#3
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35 Psi Front, 31 Psi Rear I run on my 225/40/18 Speedlines. This is as stated by Prodrive in the installation paperwork for the red 05-07 lowering STi spring kit I have fitted they once did. Seems to work for me.
10 March 2018, 11:47 AM
#7
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10 March 2018, 12:48 PM
#9
Start with OEM (is it 2.1bar F; 1.9 R?).
See how she feels/handles, then alter by +/-2psi (probably increase only, because of lower profile tyres), as necessary.
Repeat, etc.
Then once settled upon, check the tyre wear pattern is even - say, check every month (but obviously disregard any outer-edge 'roundabouts-based wear', though!
)...
See how she feels/handles, then alter by +/-2psi (probably increase only, because of lower profile tyres), as necessary.
Repeat, etc.
Then once settled upon, check the tyre wear pattern is even - say, check every month (but obviously disregard any outer-edge 'roundabouts-based wear', though!
)...
Last edited by joz8968; 10 March 2018 at 12:49 PM.
10 March 2018, 04:47 PM
#12
Originally Posted by Jon T
Oem works out to 31front 27back seems a bit low to me
That's 2.1 and 1.8 bar respectively. All but the same as for the Classic 205/50/16 tyre.
But yeah, the New, Age have 17" and lower profile tyres (and the car is heavier), which you would have thought would need slightly raised pressure - even as std. That said, Subaru would have arrived at those pressures during the car's development testing, etc.
But seeing as you've gone up by "+1" on the wheel size, then I'd be tempted to raise the pressures by at least 2psi, i.e. to 33 F; 29 R.
And go from there...
Last edited by joz8968; 10 March 2018 at 04:54 PM.
10 March 2018, 08:01 PM
#13
Scooby Regular
Start with OEM (is it 2.1bar F; 1.9 R?).
See how she feels/handles, then alter by +/-2psi (probably increase only, because of lower profile tyres), as necessary.
Repeat, etc.
Then once settled upon, check the tyre wear pattern is even - say, check every month (but obviously disregard any outer-edge 'roundabouts-based wear', though!)...
See how she feels/handles, then alter by +/-2psi (probably increase only, because of lower profile tyres), as necessary.
Repeat, etc.
Then once settled upon, check the tyre wear pattern is even - say, check every month (but obviously disregard any outer-edge 'roundabouts-based wear', though!
)...Every 2007 Owners handbook back page - "Gas Station Reference" info I've looked at (US,EU and RUS) gives 36/30, 35/29 or 36/29 for 225/45/17 90W wheel/tyre combo, so adding 35/31 to the list
Any of the above would would be a good place to start
Last edited by Don Clark; 10 March 2018 at 08:03 PM.
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