Tire Psi

[Butch McNabb]

Hi....I have a 16' Bambi and have 16" wheels. It says on the tire the psi is 65. What psi should I actually fill the tire to while cold?
Thanks,
Butch

[HowieE]

Refer to the manufacture inflation chart. The printed number on the tire side wall is a Max. pressure. The pressure you want is a function to the weight of the trailer as loaded.

[slowmover]

Or, you can read commentary on this subject from the two tire engineers who post here that the pressure tables don't apply to tires in trailer service. Max pressure per sidewall statement is best for longest and most reliable tire service. Do otherwise at a greater risk of tire failure.

[Barbieri]

Put at 65 psi when cold. Preferably in the morning. It is difficult to keep it at that depending on time of year and day. I would venture to say that all these variable are taken into consideration when the tire is being developed. Just look at the pro drivers. Once a tire is on the pressure is the last they are thinking about. And please don't put LT tires on a travel trailer. They are constructed differently and they flex. Plus the load an LT tire can handle is less than a tire for trailers.

[CRH]

I run my ST tires at the max printed on the sidewall.

[TG Twinkie]

30K miles on ST tires at 55psi. Never had a problem. No rivets shearing or hard ride problem. I limit my speed to 60mph.

[Spinonedad]

Anyone have any luck with the screw on tire pressure indicators set at 65psi?
Seems like a good idea if you don't have a TPMS on board

[majorairhead]

I run mine between 65 and 68 psi.

[Barbieri]

I can almost bet that the engineers that developed the tires had constructed a product that can handle the gyrations of tp. Just as long as you don't run them like run flat tires. Did you know that the tp of tires facing the sun in the morning is higher that the tp of tires in the shade.

[HowieE]

Originally Posted by Barbieri

I can almost bet that the engineers that developed the tires had constructed a product that can handle the gyrations of tp. Just as long as you don't run them like run flat tires. Did you know that the tp of tires facing the sun in the morning is higher that the tp of tires in the shade.

You might open a Physics book and look up TPV

[Action]

As you have found there is a max cold fill pressure on the side wall of the tire. The vehicle manufacturer (a travel trailer in this case) will also publish a cold fill pressure as well based on the design of the vehicle.

Vehicle manufacturers tend to install a tire that will just accomodate the max load with not much margin. Most passenger vehicles rarely see the max load. Many travel trailer run at or near the max load all the time, so inflating the tires to max pressure (on a cold tire) shown on the tire side wall will handle that load.

Weighing your trailer will help you to understand what load is being applied to the tires. It is useful to know that load on each tire. Or at least from side to side, front to back.

Always fill a cold tire. As a tire is used the pressure will rise because the tire is flexing in use and generates friction which generates heat. And heat causes the presure to increase. And check tires and tire pressure frequently.

>>>>>>>>>>>Action

[xrvr]

Originally Posted by Barbieri

Put at 65 psi when cold. Preferably in the morning. It is difficult to keep it at that depending on time of year and day. I would venture to say that all these variable are taken into consideration when the tire is being developed. Just look at the pro drivers. Once a tire is on the pressure is the last they are thinking about. And please don't put LT tires on a travel trailer. They are constructed differently and they flex. Plus the load an LT tire can handle is less than a tire for trailers.

Your comments about LT tires are misleading. Your opinion based on misinterpreting facts.

[Barbieri]

Sorry but it is not an opinion. I just read what is on a tire and what the manufacturer has posted on the internet.

[CruizinDux]

Here is a very long thread that I have saved and started to read. PSI discussion starts on page 7 or so I believe,

http://www.airforums.com/forums/f465...s-69297-8.html

Simply a coincidence that it opens up to Action (Moderator Dude post # 11 above) as that is where I left off. This is a great thread with a lot of varied info re tires, inflation, LT's vs ST's, 15's >16's. Also like hitches, TV's etc, no shortage of threads on the tire and tire/subcategory subject

Bob

[Action]

Originally Posted by CruizinDux

Here is a very long thread that I have saved and started to read. PSI discussion starts on page 7 or so I believe,

http://www.airforums.com/forums/f465...s-69297-8.html

Simply a coincidence that it opens up to Action (Moderator Dude post # 11 above) as that is where I left off. This is a great thread with a lot of varied info re tires, inflation, LT's vs ST's, 15's >16's. Also like hitches, TV's etc, no shortage of threads on the tire and tire/subcategory subject

Bob

Bob, Airforums is a bit customizable. Meaning the number of posts seen on a page can be different for many users. So with that said, what is on page 7 to you may be a different page to some one else even though the post count is the same. If you want to direct others to a spot in a thread (expecially a long one) direct them to a post number and all will have the opportunity to follow to the place you want them to go.
>>>>>>>>>Action

[switz]

That vintage Bambi probably has 15" GoodYear Marathon ST225/75R15D tires that are rated 2,540 pounds @ 65 psi and are mounted on 15" wheels. They would be load range "D" and sidewall restricted to a maximum of 65 mph as well.

[CruizinDux]

Re post # 15 (Action) the PSI discussion in the link starts around post #90.

Bob

[Rich Jenkins]

Originally Posted by Spinonedad

Anyone have any luck with the screw on tire pressure indicators set at 65psi?

Seems like a good idea if you don't have a TPMS on board

Uhhhh...yeah, 65 (GYMs with rubber stems) and 50 (Michelins with steel stems, current tire).

I use the TST 507 monitor with the screw on sensors. Seems to work pretty well. Been across the country a couple times. Support by TST was excellent when I had a few questions on programming and set up.

[Rich Jenkins]

Originally Posted by Butch McNabb

Hi....I have a 16' Bambi and have 16" wheels. It says on the tire the psi is 65. What psi should I actually fill the tire to while cold?

Thanks,

Butch

If they are Goodyear Marathons, I would use 65.0 psi and watch tire pressure like a carny giving me change from a $50 bill.

[markdoane]

Originally Posted by Llando88

If they are Goodyear Marathons, I would use 65.0 psi and watch tire pressure like a carny giving me change from a $50 bill.

Nope, that was a $40 dollar bill, I'm sure it was. . .