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Old 08-19-2009, 01:09 AM   #1
Gel Mibson
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Default How much air to put in tires with aftermarket wheels?

My car came with 17' Axis wheels. I'm not sure what type of model they are, but how can I find how much psi is supposed to be in each tire? Is there any way I can find out or is there a standard psi for 17' wheels with tires. Thanks
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Last edited by Gel Mibson; 09-08-2009 at 02:02 AM.
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Old 08-19-2009, 01:59 AM   #2
pauli18c
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the wheel has nothing to do with it. read the tire (usually 42psi max). i would try 36 front / 34 rear and play around from there. its all preference
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Old 08-19-2009, 11:41 AM   #3
Gel Mibson
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Thanks, i'll try that out.
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Old 08-19-2009, 04:43 PM   #4
mosc
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Matters on the tire too, particularly when it comes to sidewall stiffness. Also, you'll definitely want less pressure around town than you would at the track.

I'm pretty sold on 35/32 atm but I have a very different setup than you. Experiment, you'll figure something out.
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Old 08-19-2009, 05:44 PM   #5
van_dutch
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Are you talking daily driving or at a motorsports event?

Some will swear by not putting less than 35PSI in to protect your wheels during daily driving. This, however, may not produce the response and wear you want during autox or a track day. Then there is drag racing which requires adjustments to hook up right. Regardless, I agree with mosc in that you need to experiment to find something that is comfortable and gives you the driving characteristics you desire.
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Old 08-19-2009, 07:41 PM   #6
UFOpilot
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Whoa, the correct answer to the question depends on the tire in question first, the use of said tire second.

eg; If I put 36/34 in the tires on my car, I would be riding on marshmallows. I put 51 psi valve stems on and start with 45 front, 43 rear cold. I then will bleed off as needed at the course (auto-x). With that said, I haven't bled any off the last two events and they are right where they want to be.

Use a pyrometer if you are going to fine tune with pressure, it is the only way to be 100% accurate with what you are doing. If you are not running 10/10ths or even competing, then it is not as necessary, but wouldn't be a bad thing.

Each tire compound, design, and size have a sweet spot for alignment specifications and pressure. I wouldn't take advice from anyone who states otherwise.

Travis
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Old 08-20-2009, 11:39 AM   #7
Patrick Olsen
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Judging by the fact he doesn't even know what wheels and tires he has, I don't think he's asking how to tune his pressure with a pyrometer. That's a bit of overkill for 99% of motorists.

Starting with pressures in the mid-30s somewhere is a reasonable suggestion. Let us know the tire size and model and we can give more focused recommendations.

Pat Olsen
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Old 08-22-2009, 05:56 PM   #8
Gel Mibson
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Sorry, new to this, but I wrote this down from my tire. I'm not sure if it's the right information, but here it is.

BF Goodrich G-Force T/A KDW 225/45ZR17 90Y.

Just to clear some stuff up too - this car is for DD, not for tracking.

Last edited by Gel Mibson; 08-22-2009 at 06:29 PM.
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Old 08-22-2009, 07:02 PM   #9
Patrick Olsen
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So, again, mid 30s is a good place to start.
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Old 08-22-2009, 07:03 PM   #10
UFOpilot
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In that case, whatever the max pressure on your door card is likely max. I assume you are stock valve stems. For daily driving with that tire, it is simple and any number between 32-38 would probably work just fine. I would start on the high side and see how you like the handling. Then I would get the rears a couple pounds lower than the fronts and see how you like that. Obviously when you find what you are looking for, stick with it. I would also suggest adjusting the front and rear independently otherwise you won't know which adjustment made the change you liked/didn't like.

Travis
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Old 08-22-2009, 10:28 PM   #11
Gel Mibson
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Thanks for the info guys!
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