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Old 10-24-2008, 11:38 AM
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Default Trailer Tire Pressure

Hello ~ Did a search w/ zero luck.
I have a triple axle loadmaster that I tow my 31 Contender with. Nowhere on the tires or trailer can I find the recommended tire pressure. I am about to pull the boat for it's annual 6 mile tow home & want to make sure I have the tires in order.
Appreciated,
Chris
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Old 10-24-2008, 11:47 AM
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Default Re: Trailer Tire Pressure

Nevermind - Found it on Goodyear's site....
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Old 10-24-2008, 12:32 PM
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Default Re: Trailer Tire Pressure

Let me guess. 50 PSI?
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Old 10-24-2008, 02:32 PM
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Default Re: Trailer Tire Pressure

Air pressure is probably not much of a concern if you're only going 6 miles.

It's always been interesting to me that Goodyear doesn't make their recommendation for increasing pressure for speeds greater than 65 mph more visible. From Goodyear's web site:
Based on industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph, it is
necessary to increase the cold inflation pressures by 10 psi above the recommended pressure for the load.
http://www.goodyear.com/rv/pdf/marat...nfo_032806.pdf

Bill
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Old 10-25-2008, 06:05 AM
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Default Re: Trailer Tire Pressure

You should be more concerned with the attitude of the tire and how is sits on the ground. i.e. air up until the tire sits flat on the ground like a tire should. Too much air and the tire will get too round with very little contact on the outer tread and the ride is much harsher. Too little you will be generating a lot of heat and rolling friction. Typically 35-45 is the ideal pressure.

I use the same idea to get people to think about their car. Just because you run tires that are rated for 50 PSI MAX loaded, you really never want to inflate them that much. Most cars are good to go with ~30-40 PSI. I run BFG A/T's on my truck and if I go over about 38 PSI, it's noticeably rougher and the tread wear is uneven too (wears in the center).
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Old 10-25-2008, 06:06 AM
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Default Re: Trailer Tire Pressure

Oh yeah, a good way to check this is put a piece of tape or a chalk mark across the tread and go a few rotations. You'll be able to see what's going on...
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Old 10-25-2008, 01:15 PM
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Default Re: Trailer Tire Pressure

Trailer tires should be inflated to the maximum pressure listed on the sidewall. I'll bet it's there somewhere. Usually, it's 50 PSI.
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Old 10-25-2008, 07:11 PM
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Default Re: Trailer Tire Pressure

Quote:
rwidman - 10/25/2008 3:15 PM

Trailer tires should be inflated to the maximum pressure listed on the sidewall. I'll bet it's there somewhere. Usually, it's 50 PSI.
Bullshi!t! If I ran my trailer tires at 50 PSI, the tires would only sit on the center tread!

Same rules for vehicles apply to trailers... There's a thing call a tire inflation chart and it will give you the inflation pressure that will give you the best tire life and ride. Again, just like a car/truck.

Don't believe me? Then go check your truck tires. Are they at the max PSI or somewhere around the vehicle manufucturer's recommended inflation?

Here's a direct quote from Goodyear - http://www.goodyear.com/rv/tirecare/...iontables.html

Notice there is also the table on another link.

"Since RVs can be loaded with many different configurations, the load on each tire will vary. For this reason, air pressure should be checked based on the load on each individual tire. Inflation pressure should be adjusted to handle the maximum tire load, and all tires on the axle should carry the same inflation pressure. "
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Old 10-27-2008, 09:52 AM
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Default Re: Trailer Tire Pressure

Big difference between a car tire and trailer tire. Our local trailer dealership recommends run max tire pressure in all type trailers boat or cargo.
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Old 10-27-2008, 10:11 AM
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Default Re: Trailer Tire Pressure

Max PSI is the way to go.
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Old 10-27-2008, 11:17 AM
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Default Re: Trailer Tire Pressure

Since trailer tires are routinely loaded close to their max and any tire will only carry its max rating at max inflation, its best to run trailer tires at the max shown on the tire sidewall.

http://www.goodyear.com/rv/pdf/rv_inflation.pdf

Ken
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Old 10-27-2008, 11:21 AM
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Default Re: Trailer Tire Pressure

Quote:
ReelWork - 10/25/2008 10:11 PM

Quote:
rwidman - 10/25/2008 3:15 PM

Trailer tires should be inflated to the maximum pressure listed on the sidewall. I'll bet it's there somewhere. Usually, it's 50 PSI.
Bullshi!t! If I ran my trailer tires at 50 PSI, the tires would only sit on the center tread!

Same rules for vehicles apply to trailers... There's a thing call a tire inflation chart and it will give you the inflation pressure that will give you the best tire life and ride. Again, just like a car/truck.

Don't believe me? Then go check your truck tires. Are they at the max PSI or somewhere around the vehicle manufucturer's recommended inflation?

Here's a direct quote from Goodyear - http://www.goodyear.com/rv/tirecare/...iontables.html

Notice there is also the table on another link.

"Since RVs can be loaded with many different configurations, the load on each tire will vary. For this reason, air pressure should be checked based on the load on each individual tire. Inflation pressure should be adjusted to handle the maximum tire load, and all tires on the axle should carry the same inflation pressure. "
ReelWork,

Profanity is not going to add any credibility to your response.

We are talking about trailer tires on boat trailers here, not trucks or RVs. Yes, my truck tires are inflated to the truck manufacturer's specifications, not maximum pressure. My boat trailer tires are inflated to the maximum (50 PSI) because that's what the trailer manufacturer, the tire manufacturer, and most trailering authorities recommend.
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Old 10-27-2008, 12:15 PM
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Default Re: Trailer Tire Pressure

Boat trailers, cargo trailers and RV tires are all the same.... I can't recall ever seeing a Goodyear Marathon with a BOAT designation (or any other trailer tire for that matter).

The common theme here is what kchace stated in that most trailers are at/near their max. Again, if you have a load on a trailer, you should be smart about it is inflated and go by the tire profile. If you're near max weight, then obviously go with max PSI.

Max PSI is also a legacy mindset from the old bias ply tires to reduce heat and friction which caused blowouts.

rwdiman, you're spot on with your response "My boat trailer tires are inflated to the maximum (50 PSI) because that's what the trailer manufacturer, the tire manufacturer, and most trailering authorities recommend."

That is basically what I have been saying. You don't go with 50 PSI jsut because your tires are rated for it. You go with what the trailer is recommended. Often these are the same.


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Guess What?? I got a Fever.. And the only prescription is.. MORE COWBELL!



-2011 Blue Wave 2400 Pure Bay / Yamaha F300 4.2 with Command Link Plus
-2003 Sea Fox 195 Bayfisher - Mercury 125 Saltwater Classic (Sold)
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Old 10-27-2008, 12:43 PM
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Default Re: Trailer Tire Pressure

Quote:
ReelWork - 10/27/2008 3:15 PM

Boat trailers, cargo trailers and RV tires are all the same.... I can't recall ever seeing a Goodyear Marathon with a BOAT designation (or any other trailer tire for that matter).
No, RV tires are different. I don't know if Goodyear makes them but tires on trailers should be type "ST" (special trailer). Type ST tires are built differently than other tires.

From: http://www.championtrailers.com/tire_art.html

Quote:
TRAILER TIRES
Trailer Tire requirements differ greatly from automotive tires. Automotive tires must maintain traction during all driving conditions: pulling, stopping, turning, or swerving. Because of this they must have more flexible sidewalls to maintain tread to road contact. Since trailers have no driving torque applied to their axles, the only time trailer tires must have traction is during the application of trailer brakes.
Trailers with heavy loads, high vertical sideloads (like camper trailers), or trailers with inadequate tongue weight can be affected by trailer sway problems. Automotive bias or radial tires with their more flexible sidewalls can accentuate trailer sway problems, whereas the stiffer sidewalls of the ST (special trailer) bias ply tires help to control and reduce sway problems. For this reason it is not recommended that (P) Passenger or (LT) Light Truck tires be used on trailers. Best trailer control will be achieved with (ST) Special Trailer tires.
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Old 10-27-2008, 01:04 PM
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Default Re: Trailer Tire Pressure

I stand corrected - I misspoke. When I refer to RV's, I lump 5th wheels and tow behinds. The winnebago type RV's I call a "Coach" probably due to having my Bro-in-law in the "Coach" business (Monaco primarily). My apologies...

But you reinforced my point about ST - trailer tires are trailer tires.. There aren't specific boat or trailer tires, just ST (which we should all be running on our trailers, just about any trailers.
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Guess What?? I got a Fever.. And the only prescription is.. MORE COWBELL!



-2011 Blue Wave 2400 Pure Bay / Yamaha F300 4.2 with Command Link Plus
-2003 Sea Fox 195 Bayfisher - Mercury 125 Saltwater Classic (Sold)
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Old 10-28-2008, 12:21 PM
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Default Re: Trailer Tire Pressure

Motor homes use truck tires, all trailers should use ST tires whether bias ply or radial. Heavier sidewall constuction, trailer sway, and lack of driving torque all contribute to the industry standard of filling to maximum pressure. Maximum pressure can vary depending on number of plys and load rating. Examples; C rated (50 psi), D rated (65 psi), E rated (80 psi) for special trailer tires.

http://www.discounttiredirect.com/di...rTireFacts.jsp
http://www.easternmarine.com/em_stor...tech_info.html
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Old 10-28-2008, 09:48 PM
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Default Re: Trailer Tire Pressure

That is basically what I have been saying. You don't go with 50 PSI jsut because your tires are rated for it. You go with what the trailer is recommended. Often these are the same.

Since most trailer manufacturers recommend going to max rated tire pressure, I guess that's one way of saying "opps, I stand corrected". Ya gots to be careful not to get any on ya when zinging those slinging bovine fecal matter comments ...
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Old 10-29-2008, 09:57 AM
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Default RE: Trailer Tire Pressure

I trashed 2 new tires by not checking air pressure. Which states 35lbs on this St 175/80D 13 LRC.
the air was down and the sides of the tire went bald while the middle looks brand new. I pumped them up to 35 and used the trailer 3 times so far.

Not to steel this post but how much of a chance am I taking riding on these? small little 17'3" boat on a Venture trailer.

Thanks

Jay
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Old 10-29-2008, 10:22 AM
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Default RE: Trailer Tire Pressure

Quote:
Harley Rider - 10/29/2008 12:57 PM

I trashed 2 new tires by not checking air pressure. Which states 35lbs on this St 175/80D 13 LRC.
the air was down and the sides of the tire went bald while the middle looks brand new. I pumped them up to 35 and used the trailer 3 times so far.

Not to steel this post but how much of a chance am I taking riding on these? small little 17'3" boat on a Venture trailer.

Thanks

Jay
It all depends on the load rating of the tires vs the weight on them.

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Old 10-29-2008, 03:58 PM
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Default Re: Trailer Tire Pressure

I always go to 2-3lbs under max pressure on the side wall. Why quess what the correct tire pressure/load is. Also less rolling resistance better for truck & trailer, tires run much cooler. I have a 31 contender on a 12,500Lb loadmaster trailer which I trailer about 500-1000 miles a year. Running 3 year old carlisle radials with NO problems. Kodiac SS electric over hydraulic on all six wheels, best damm trailer I ever owned!!!!!!!!!!!
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