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Old 06-15-2013, 07:36 PM   #21
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Good Stuff, Great Info!!
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Old 06-15-2013, 07:44 PM   #22
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To use this data you MUST weigh your camper to determine the actual load on the tires.

If you are in the "fill it up to max on the sidewall and never weigh" crowd; All this is moot since you will never know the correct pressure. Speed Limit 65 MPH.
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Old 06-15-2013, 07:55 PM   #23
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Originally Posted by garbonz View Post
regarding blowouts and not to hijack, but who has had a blowout with a TPMS and did it help, or prevent damage? I can think of some scenarios where it would help, maybe, but a sudden blowout maybe not?
Sudden blowouts will not be detected by TPMS ( tread seperation, puncture from road debris...), blow outs that may occur due to low tire pressure or high tire temps which both will occur over a short period of time, TPMS will help you there.
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Old 06-15-2013, 08:11 PM   #24
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Let see if I understand this?

MAX51 ST225/75R15* D/8 10 2540 @ 65 2200@65 28.3 8.78 13.3

I have Towmax Tires size: ST225/75R15 Load D 8 Ply. They are rated for 2540 @65 lbs of air. My trailer has tandem axles so I have 4 tires on the ground. If I weigh my trailer fully loaded and it does not exceed 10,000 lbs by max speed should be 65 mph, but if i increase the pressure to 70 lbs I should be ok at 70 mph?
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Old 06-15-2013, 08:24 PM   #25
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Had Canadian Marathons on my previous rig when new. Two blowouts and then went to the much touted Denmans-now out of business. Two blow outs with them and a seperated belt on another and decided to go from 225/75r15 to 225/r16 BFG Commercial T/A.

Before anyone tries to give me the virtue of the Marathons, let me state that I was well under my weights, never drove 60 unless accelerating to pass another vehicle and ran 65 psi checked daily and used a TPMS.

You can go to the RV.Net forum and do a search on ST tires. The opinions are almost unanimous on using LT tires.
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Old 06-15-2013, 09:00 PM   #26
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Get back with me in two weeks. I just put a TST TPM System on my tires and will be traveling 1300 miles each way. I'm trying to get one more long trip out of my China bombs (Trail Express) before replacement next year (which is why I was looking at where the Marathons were made.) I've inflated to max 50 PSI and cleaned them up very good so I can monitor their condition at each stop.

Discount can order the Maxxis M8008s, but doesn't stock them locally.
Joe,
We have had the TST TPMS for about 15K miles without any problems. We check T.P. each morning when towing (our '13 Cedar Creek 36CKTS, 16,280 lbs). We spot check to system periodically with a digital gage and find the accuracy spot on!

We did blow a tire when the shear spring failed and transferred its load to the adjacent wheel. I had a warning just before it blew and thanks to the Kodiak Disc brakes I was able to park the trailer in less than 1/10th mile following blowout with minimal damage! The tire had 95 (cold) psi and blew @ 122 psi & 58 MPH.

Without TPMS we would still be guessing as to cause & have a lot more damage to boot.

When the batteries die (5 years) I'll pay the cost to upgrade to the service through sensor that TST now has available.

Travel safe, informed with facts & enjoy your journeys!
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Old 06-16-2013, 11:10 AM   #27
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Is my understanding correct?

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Originally Posted by Rickflint View Post
MAX51 ST225/75R15* D/8 10 2540 @ 65 2200@65 28.3 8.78 13.3

I have Towmax Tires size: ST225/75R15 Load D 8 Ply. They are rated for 2540 @65 lbs of air. My trailer has tandem axles so I have 4 tires on the ground. If I weigh my trailer fully loaded and it does not exceed 10,000 lbs by max speed should be 65 mph, but if i increase the pressure to 70 lbs I should be ok at 70 mph?
Is the correct conclusion?
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Old 06-16-2013, 11:54 AM   #28
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Is the correct conclusion?

I always hate to see this inflation vs speed topic come up, as it is always confusing to many people.

Lou explained it properly in his post #20.

You shouldn't exceed the MAXIMUM air pressure specified for the tire. Your load range D tires are maxed out at 65 PSI. That is the most air you should ever put in the tires.

If you put 65 PSI in the tires, you can always weigh the trailer to see how much load there is per tire, which requires you to weigh axles separate if you have more than one axle. This is another reason I hate to delve into the generalities of this, as each tire is not always carrying the same load, nor is each side of the trailer weighted the same. Each tire may be carrying different weights, thus need different air pressures to run over 65 mph. it's not always an equal thing.

IF you are running the max air pressure of 65 psi, but the actual load per tire would only require 55psi, then you can run 10 mph over 65 mph.

I've always just personally thought it was much easier for everyone to make sure they didn't overload their tires capabilities, air them to max pressure to assure they can carry the weight, and limit their speed to 65 mph or under to be sure......then worry about important things, like did you pack the bug spray and/or remember to close the garage door at the house.
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Old 06-16-2013, 01:12 PM   #29
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wmtire wrote "I've always just personally thought it was much easier for everyone to make sure they didn't overload their tires capabilities, air them to max pressure to assure they can carry the weight, and limit their speed to 65 mph or under to be sure......then worry about important things, like did you pack the bug spray and/or remember to close the garage door at the house."

Very well said.
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Old 06-16-2013, 04:06 PM   #30
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I seem that Towmax has a 225/75R-15 with a E rating w/80psi and 2830 Load Limit
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