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Old 06-06-2015, 08:39 PM   #1
Mike V
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Default Tubeless tire pressure

I recently changed to tubeless slicks,Hoosier 29 x 9 (bias ply).The car is an automatic weighing 3300 pounds.I am still running 12.75 pounds of air.But after looking at this picture I think I need to raise the pressure.Any suggestions of where the pressure should be?
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Old 06-06-2015, 10:19 PM   #2
J.R. Haddad
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Default Re: Tubeless tire pressure

What size is the rim? J.R.
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Old 06-06-2015, 10:39 PM   #3
Myron Piatek
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Post Re: Tubeless tire pressure

I've heard pressures from 14 to 25+ lbs from 9" tire racers. Lot's of variables, but most seem to be in the high teen to low 20 range. I have Hoosier 9"X 30" Lightweight Radial Slicks at 21 lbs on a 10" rim, car weighing 3,540 and footbraking. Wider rims allow more pressure and radials seem to like a little more than bias ply. I fine-tuned it by watching if contact is being made all the way across the tread (may need less if not) or if rubber is being laid over the side (may need more).
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Old 06-07-2015, 06:52 PM   #4
Mike V
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Default Re: Tubeless tire pressure

They are 15 x 10 rims. The car is working great ,but I'm concerned about how safe it is.Thinking of going up 1/2 to 3/4 of a pound and see what happens.
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Old 06-07-2015, 06:59 PM   #5
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Default Re: Tubeless tire pressure

Try 20 PSI. Don't be afraid of more pressure in the radials.
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Old 06-07-2015, 07:20 PM   #6
Sean Marconette
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Default Re: Tubeless tire pressure

I run 15x10 with 29.5x9 bias ply but a stick car. Never been above 15 lbs unless I want to spin. OP stated bias ply. Try 13 lbs and work up from there.

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Old 06-07-2015, 08:16 PM   #7
J.R. Haddad
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Default Re: Tubeless tire pressure

Bias ply and radials have nothing in common. Start at 20 lbs. with a 10
inch rim, and go UP from there.
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Old 06-07-2015, 09:36 PM   #8
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Default Re: Tubeless tire pressure

Same tire and wheel size on one of our bracket cars = 16 to 17 is where we
ended up. Seemed high for bias but lower pressure really tore up sidewall.
Our car is 3300 LB. with 1.5 to 60 Ft.
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Old 06-07-2015, 09:50 PM   #9
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Default Re: Tubeless tire pressure

Quote:
Originally Posted by Mike V View Post
I recently changed to tubeless slicks,Hoosier 29 x 9 (bias ply).The car is an automatic weighing 3300 pounds.I am still running 12.75 pounds of air.But after looking at this picture I think I need to raise the pressure.Any suggestions of where the pressure should be?

What does the car usually 60' like? Definitely more pressure, the tire looks like it's trying to roll over itself.


I would up the pressure a bit, work towards 13-14lbs., and maybe make a shock adjustment if needed also.


I'm no expert though.
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Old 06-07-2015, 10:34 PM   #10
Mike V
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Default Re: Tubeless tire pressure

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Originally Posted by NOVALOU View Post
What does the car usually 60' like? Definitely more pressure, the tire looks like it's trying to roll over itself.


I would up the pressure a bit, work towards 13-14lbs., and maybe make a shock adjustment if needed also.


I'm no expert though.
Usually low to mid 1.60's. I will have to up the pressure and mess with the rear shocks.I see a day of testing in my future. Thanks
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