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Old 06-15-2013, 11:16 AM   #11
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Are either of these tires rated for speeds higher than 65? Looking for something rated for 70.
All ST tires are rated at a max of 65, but supposedly you can increase the pressure by 10# and I think it allows an increase of 10mph.
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Old 06-15-2013, 11:19 AM   #12
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All ST tires are rated at a max of 65, but supposedly you can increase the pressure by 10# and I think it allows an increase of 10mph.
Actually, there are some tires rated to 75mph. I don't recall which one, but it's been mentioned here and I looked it up on the mfr site.

You're right about Goodyears and the extra 10 psi/mph, but you have to use load tables and still not exceed the maximum pressure for the tire/wheel.
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Old 06-15-2013, 11:34 AM   #13
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The following sites offer some info on RV / Trailer tires: Goodyear RV Tires & Bridgestone RV Tires
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Old 06-15-2013, 11:35 AM   #14
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Marathon has a set of 235/75R-15 that are E rated they are for 75mph.
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Old 06-15-2013, 11:47 AM   #15
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Originally Posted by ependydad View Post
Actually, there are some tires rated to 75mph. I don't recall which one, but it's been mentioned here and I looked it up on the mfr site.

You're right about Goodyears and the extra 10 psi/mph, but you have to use load tables and still not exceed the maximum pressure for the tire/wheel.
According to this GY bulletin you can exceed max pressure by 10#.
Attached Files
File Type: pdf Marathon_Special_Trailer_Applications.pdf (115.2 KB, 33 views)
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Old 06-15-2013, 11:52 AM   #16
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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?
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Old 06-15-2013, 01:02 PM   #17
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tire upgrade

My 829fkss had carlisles on it. 2 years old and all 4 had drychecking in the sidewalls. I did some research and it seems that manufacturers install tires with bare minimum specs for the application intended. My trailer had load range "C" tires from the factory. They were replaced with "e's".
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Old 06-15-2013, 01:23 PM   #18
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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.
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Old 06-15-2013, 04:54 PM   #19
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The tires I have now are Prometer has any one herd of this animal? The only way I found them is on e-bay.
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Old 06-15-2013, 07:19 PM   #20
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Originally Posted by Rickflint View Post
Are either of these tires rated for speeds higher than 65? Looking for something rated for 70.
All ST tires are speed rated for 65 MPH AT THE RATED LOAD.

If you have "room" to add pressure to the tire (not to exceed its max rating) you can add 1 MPH for every PSI above the correct pressure required for the load (up to 10 PSI maximum for 75 MPH possible). See attached product data sheet and Maxxis (as an example) for the following explanation.

So,

Say you have ST225/75R15 Load range "C" tires and when you weighted the camper the actual load on each tire was 1880 pounds. With this load, those tires require 40 PSI (50 PSI max for load range C) to support that load and have a speed rating of 65 MPH.

Increasing the pressure by 5 PSI over the required pressure of 40 PSI (45 PSI in the tire), you will increase the speed rating to 70 MPH. Increasing to 50 PSI (the max allowed for these tires), you will increase the speed rating to 75 MPH. NOTE: This ONLY works if you have 1880 pounds (OR LESS) of load on the tire!

If the next time you go out and weigh the camper, you discover you have 2020 pounds of load on the tire; you will need to have 45 PSI in the tire to have the correct tire pressure for your load and the speed rating will be back to 65 MPH. You could add up to 5 PSI (again you can not exceed the sidewall max) to boost your speed rating to 70 MPH; but no higher.

If your camper's tires are maxed out at 2150 pounds per tire (50 PSI required), you are screwed and are stuck with the 65 MPH rating since you can no longer increase the pressure. A solution is to upgrade your tires (keeping the same size tire) to load range "D" (65 PSI max) allowing you to run 10 PSI higher (60 PSI - provided your rims and stems can support that pressure) and run at 75 MPH speed rating again.
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