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Old 08-10-2005, 01:22 AM   #1
nick04263
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Member#: 68799
Join Date: Aug 2004
Chapter/Region: MAIC
Location: Maryland
Vehicle:
2004 WRX COBB STG 2+
PSM

Default Best PSI for tires

I am running:

225/45YR-17 Michelin Pilot Sport PS2

on:
17x7.5 SSR GT2 Silver Wheels.

They came mounted and balanced from Tirerack with 41 PSI but they feel a little soft when driving. Their max PSI is 51, so should I up the pressure a few PSI and try that out or is this to be expected from these tires. Anyone have any helpful info. Any and all is appreciated (as long as constructive).
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Old 08-10-2005, 08:28 AM   #2
Luke@tirerack
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new tires will feel a little softer due to the tread depth ..... taller tread block flex more than worn tread blocks ... I would recommend 36 psi
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Old 08-11-2005, 03:44 AM   #3
brado
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Quote:
Originally Posted by Luke@tirerack
new tires will feel a little softer due to the tread depth ..... taller tread block flex more than worn tread blocks ... I would recommend 36 psi

^ if they feel soft, why put less pressure...36<41.








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Old 08-11-2005, 05:28 AM   #4
ripvw
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Quote:
Originally Posted by brado
^ if they feel soft, why put less pressure...36<41.
uh - you copied the answer in your own post...

Quote:
Originally Posted by Luke@tirerack
new tires will feel a little softer due to the tread depth ..... taller tread block flex more than worn tread blocks ...
as Luke explains here, the new tires feel soft, but that will go away as they begin to wear. Most new tires will continue to improve in feel and overall grip for the first 500 to 1k miles

in addition, Luke's suggestion of 36psi is right on for someone interested in maximum grip. Tire pressures are a compromise between steering feel and max grip. The more you pump up the tires, the better the steering response will feel. however, at some point you will begin to sacrifice overall grip for increased feel. 36psi is a very good starting point to begin finding out what the "magic" psi will be for the specific tire in question. nick04263 can increase pressure 1-2 psi at a time to find out if 36psi is where he wants to stay or if 38psi or 40psi feels better without sacrificing grip.

anything over 40psi cold on the street IMO is likely to be too high - chasing better feel at the expense of grip. Since grip is what tires are all about, keeping the pressure below 40psi cold in most cases will give you better dry handling. the vast majority of "recommended" presssures offered up by most people on this board are way too high for the street. there isn't anyone posting on this board that has anywhere near the knowledge and experience with tires that Luke has - I suggest you listen to him instead of spending your time posting smartass comments in every thread you enter:

http://forums.nasioc.com/forums/sear...archid=2396188

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Last edited by ripvw; 08-11-2005 at 06:23 AM.
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