Tyres - Drop in pressure required?
03-19-03, 04:51 PM
#1
Pole Position
Thread Starter
Tyres - Drop in pressure required?
When one goes from a narrow tyre such as a 205 mm width, to a 225 mm width, it is obvious a drop in tyre pressure would be recommended. You just don't need that much air pressure. My question is, how much do you need to drop it by? Does anyone have a formula for this or some personal experiences? Thanks in advance.
Y. Chachad
Y. Chachad
03-19-03, 05:04 PM
#2
Intermediate
The tire size doesn't have anything to do with the air pressure....naturally a bigger tire will hold more air at a given psi.
I run 235s on my LS400, 33psi front, 31 psi rear. Works for me.
32psi all around is ALWAYS a safe bet.
I run 235s on my LS400, 33psi front, 31 psi rear. Works for me.
32psi all around is ALWAYS a safe bet.
Last edited by seanl; 03-19-03 at 05:05 PM.
03-20-03, 08:30 AM
#4
Intermediate
You are seriously overanalyzing this...
A 205 or a 225 is going to take the same air pressure, around 32psi, on an average passenger car. Granted a big rig 18 wheeler has different size tires than a car and probably takes different air pressures.
Both of my cars have approx 32psi in the tires, yet my Acura wears small 205/55/15s and the Lexus has 235/50/16s.
I'm not sure what kind of information you're looking for, but there's no calculations needed.
A 205 or a 225 is going to take the same air pressure, around 32psi, on an average passenger car. Granted a big rig 18 wheeler has different size tires than a car and probably takes different air pressures.
Both of my cars have approx 32psi in the tires, yet my Acura wears small 205/55/15s and the Lexus has 235/50/16s.
I'm not sure what kind of information you're looking for, but there's no calculations needed.
Last edited by seanl; 03-20-03 at 08:31 AM.
03-20-03, 08:59 AM
#5
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I have to agree with Selewis. Tire size doesn't matter for tire pressure. You can look at the side of the tire and it will tell you the maximum pressure for that tire. You should always put in the amount of air that Lexus recommends within 5 psi. Personally, I go with 38 psi front and rear, as recommended by my tire shop. Also remember to check your tire pressure every month because tire pressure changes 1 psi for every increase or decrease of 10 degrees farenh. Also rotate front to rear every 5-8k miles.
03-22-03, 12:25 AM
#6
Check your glove box for the correct tire pressure settings. My 1997 LS400 said 29# normal and 32# maximum. Those pressures were lower than all my experience (10 year Honda Parts & Service manager) would indicate was right for a car this size but I dropped the pressure to 29# and the ride/handling improvement was amazing. Before the car was "busy" on the road and now it tracks to perfection. Mileage remains 22-23 mpg. Go with what Lexus recommends for your year and model!
Last edited by 97LS400; 03-22-03 at 09:46 AM.
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