Sorry to do this, as I am sure it has been discussed a lot - but my searches came up dry...So there was advice floating around on a past boat forum that properly inflated ST tires were rated for a max speed of 65 mph. For speeds higher, then the official word supposedly was to inflate by 10 lbs higher.I see in an issue of Trailer Life that the same kind of advice was given. For my fifth, I did not see any inflation sticker, so I have always been inflating to the max on the sidewall. But, if I am going to be towing in the 65-70 mph range, should I be going 10 lbs over that? Or is the sidewall pressure the "never exceed" amount?

Advice to drive faster than recommended and using higher pressure than recommended? Doesn't at all sound like good ideas.

I believe Goodyear Marathon said 5# on their web site.

Max tire pressure is for the Load, it has nothing to do with Speed. IMHO

Pony up for LT tires would be my advice if you intend to use the STs beyond their spec. Overfilling is just a bad ideas IMO.Probably not best towing at those speeds especially with a 1/2 ton as your TV.

W5CI wrote:Max tire pressure is for the Load, it has nothing to do with Speed. IMHOWhile the tire pressure is for load, Max Speed rating is not an opinion. It's clearly stamped into the sidewall of ST tires. Blowouts occur because of under inflation and/or heating up the tires because of running them over their speed rating.

Inflating tires 10lbs over? | Good Sam Community

56 Replies

BarneyS
Explorer III
Dec 27, 2015

Thread closed.
NC_Hauler
Explorer
Dec 27, 2015
nevadanick wrote:
I am safe.

I'm glad for you.....so am I.
nevadanick
Explorer
Dec 27, 2015
I am safe. The years of experiance reminds me of people that have years of experiance at work. The best thing i seen happen was when a guy was let go after 1 week. The guy that hired him handed him a check and said he wasnt needed anymore, that he had lied about his experiance. Was told he had 20 years experiance. The guy letting him go said you dont have 20 years experiance, you have one year experiance 20 times.
NC_Hauler
Explorer
Dec 27, 2015
nevadanick wrote:
Thats just it, its your opinion and not based on what the facts of someone elses lifes needs are or what someone's abilities to handle situations are.

There are quite a few of us in here with years and years of towing experience behind us and more than capable of handling "situations"... It's the possible sudden stop or sudden maneuver one might have to make at 75-80 mph instead of 65 mph CAUSED BY SOMEONE ELSE, that may be the ONE time that one wishes they hadn't been towing a 5er at 75-80 mph that could come back to haunt one....but that won't happen to me..:R

...be safe in your rush to "get away from it all, go camping and relax".
rhagfo
Explorer III
Dec 27, 2015
atwowheelguy wrote:
Also please consider stopping when towing at higher speeds.

Kinetic energy must be dissipated to heat by braking in order to stop.

KE = 1/2 mv^2

Kinetic Energy equals one half mass times velocity squared.

So comparing 65 mph to 80 mph, (80/65)^2 = 1.51.

So a 23% increase in speed results in a 51% increase in energy to be dissipated. That means 51% longer braking distance at 80 mph than at 65 mph. Is it worth the risk?

Then add to the fact if you over inflate the tires to go faster, you also reduce the contact patch of the tire gets smaller and provides less stopping power.
nevadanick
Explorer
Dec 27, 2015
Thats just it, its your opinion and not based on what the facts of someone elses lifes needs are or what someone's abilities to handle situations are.
tinner12002
Explorer
Dec 27, 2015
Why are people always in such a hurry...65mph is plenty fast enough for towing in my opinion!
atwowheelguy
Explorer
Dec 27, 2015
Also please consider stopping when towing at higher speeds.

Kinetic energy must be dissipated to heat by braking in order to stop.

KE = 1/2 mv^2

Kinetic Energy equals one half mass times velocity squared.

So comparing 65 mph to 80 mph, (80/65)^2 = 1.51.

So a 23% increase in speed results in a 51% increase in energy to be dissipated. That means 51% longer braking distance at 80 mph than at 65 mph. Is it worth the risk?
NC_Hauler
Explorer
Dec 27, 2015
larry barnhart wrote:
I worked with a man for 10 years that told me to go to the max and add 12 lbs. I made no comment because in 10 years his ideas usually sucked.

chevman

:B
larry_barnhart
Explorer
Dec 26, 2015
I worked with a man for 10 years that told me to go to the max and add 12 lbs. I made no comment because in 10 years his ideas usually sucked.

chevman

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Inflating tires 10lbs over?

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