tire pressure
I am preparing to install the eez tpms and went online to the michelin inflation tables. My tires are 275/r80 22.5 load range h with a front axle weight of 10840 and rear axle weight of 18340. This ma...
Forum Discussion
With all due respect to those who are trying to help, I wish people would do some more research before adding their comments.
The manufacturer's PSI numbers print inside your MH are MAXIMUM values. They are pressures required for a fully loaded coach using the OEM tires. Use different tires or (hopefully) drive at less than 100% loading or tow a toad and you can use lower PSI.
LOWER PSI = SMooTHER RIDE.
I have a F-53 spring loaded chassis, so using the minimum safe tire pressure is essential for a smooth ride.
Weight carrying capacity follows a relatively gentle performance curve near the low end of the scale. Being 1 psi over doesn't make you instantly safe, and 1 psi under is not suddenly dangerous. Many factors go into the weight rating. Know them and you will be safer than most.
Factor #1: Weight carrying capacity is speed related. Capacity increases greatly as you slow down. If a given tire can carry 8000 lb at 60 mph it will carry more than 16000 lbs at 20 mph and 32000 lbs at 10 mph.
Factor #2: Cold tire pressure ratings are given because tire manufacturers (and their lawyers) are worried that you might misuse the data ON THE HIGH end. Blow outs are far more common due to overinflation when the tire heats up and exceeds the rim / tire limits. Unlike the low end of the range, the Weight Carrying Capacity drops suddenly at the high limit.
Factor #3: Tires do not care if they are cold or hot. As I hop you have notice, a tire feels cushy at 80 psi cold or hot. It feels harsh at 100 psi cold or hot.
How do I keep the lowest safe pressure? After measuring my coach on a CAT scale, I find 76 psi is correct for my rear tires and 80 psi is correct for the front according to tables provided by Michelin. (BTW: I ignore the insignificant differences between right and left. When moving, the distribution tends to equalize - so just pick the heavier side). Now here's my secret: I set my COLD pressure to 74 psi rear and 77 psi front and yet I am 100% safe. How is that?
I drive at less than 40 mph until my tires warm up and my TPMS shows that pressure has increased to my normal driving range of about 80 psi rear and 84 psi front which is well into the safe range specified by Michelin for 70 mph. It never takes more than 10 minutes - and I have the smoothest riding gasser you will ever drive.
The manufacturer's PSI numbers print inside your MH are MAXIMUM values. They are pressures required for a fully loaded coach using the OEM tires. Use different tires or (hopefully) drive at less than 100% loading or tow a toad and you can use lower PSI.
LOWER PSI = SMooTHER RIDE.
I have a F-53 spring loaded chassis, so using the minimum safe tire pressure is essential for a smooth ride.
Weight carrying capacity follows a relatively gentle performance curve near the low end of the scale. Being 1 psi over doesn't make you instantly safe, and 1 psi under is not suddenly dangerous. Many factors go into the weight rating. Know them and you will be safer than most.
Factor #1: Weight carrying capacity is speed related. Capacity increases greatly as you slow down. If a given tire can carry 8000 lb at 60 mph it will carry more than 16000 lbs at 20 mph and 32000 lbs at 10 mph.
Factor #2: Cold tire pressure ratings are given because tire manufacturers (and their lawyers) are worried that you might misuse the data ON THE HIGH end. Blow outs are far more common due to overinflation when the tire heats up and exceeds the rim / tire limits. Unlike the low end of the range, the Weight Carrying Capacity drops suddenly at the high limit.
Factor #3: Tires do not care if they are cold or hot. As I hop you have notice, a tire feels cushy at 80 psi cold or hot. It feels harsh at 100 psi cold or hot.
How do I keep the lowest safe pressure? After measuring my coach on a CAT scale, I find 76 psi is correct for my rear tires and 80 psi is correct for the front according to tables provided by Michelin. (BTW: I ignore the insignificant differences between right and left. When moving, the distribution tends to equalize - so just pick the heavier side). Now here's my secret: I set my COLD pressure to 74 psi rear and 77 psi front and yet I am 100% safe. How is that?
I drive at less than 40 mph until my tires warm up and my TPMS shows that pressure has increased to my normal driving range of about 80 psi rear and 84 psi front which is well into the safe range specified by Michelin for 70 mph. It never takes more than 10 minutes - and I have the smoothest riding gasser you will ever drive.
