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Old 07-06-2010, 01:44 AM   #1
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Load Range D Tires and Aluminum Rims

I have 15" load range c Duro tires on my 8281SS 5th. There are several reasons why I want to change them out... I want to move to Maxxis load range d's, but I noticed the series 06 rims are only rated at 60 psi, d's run at 65 psi I believe. Has anyone done this...or should I stick with c's
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Old 07-06-2010, 10:48 PM   #2
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Why not just run the D's at 60? The sidewall rating is MAX pressure, not recommended. The pressure you run in the tires is dependent upon the weight on the axles.
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Old 07-06-2010, 11:01 PM   #3
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i did some searching around and I guess you dont have to run them at max psi... here is a handy chart http://www.maxxis.com/Repository/Files/m8008load.pdf

I dont think it would be wise to run the rims at max psi as you would want a bit of a margin? I think I would run these at 55psi and leave it at that...and have the benefit of some sturdier tires for 8$ more than load range c
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Old 07-06-2010, 11:11 PM   #4
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Just be sure that 55 psi is enough to handle the weight of your RV. Otherwise, you will get improper wear on the tires and they will wear out prematurely.
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Old 07-07-2010, 04:42 PM   #5
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I purchased some 14" aftermarket aluminum rims for my Roo and when I talked to the trailer company that I bought them from, they said that I can run 65psi on them and be fine. The maximum tire pressure was based off of the tire, not the rim...so long as I used the high pressure valve stems (max 80psi and metal sleeves all the way to the end of the stem), I would be fine. So far so good...pics of the new wheels - 2000 Roo M-18 tire/wheel options

By the way (I know someone will ask sooner or later) the tire labeling reads as 185R14C, however these are D rated tires - Kumho Radial 857

Good luck
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Old 07-07-2010, 09:34 PM   #6
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Well, just so you know, as stated above, both tires AND wheels have maximum pressure ratings. If the wheels are max 60, I wouldn't exceed it.
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Old 07-08-2010, 06:12 AM   #7
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The aluminum rims might be marked at 60psi maximum, but that is for load factor, not the additional 5 psi you're considering. You're not increasing the weight of your trailer, just the air pressure.
Goodyear recommends running ST tires at their maximum rating, though on a lighter pop up, it could create premature tire wear.
Going with the steel valve stems is a great idea. They don't rot like the stock rubber ones and they hold air better.
Also, consider balancing your new tires as it will help the ride quality of your trailer.
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Old 07-08-2010, 10:55 AM   #8
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Quote:
Originally Posted by jasoncw View Post
Well, just so you know, as stated above, both tires AND wheels have maximum pressure ratings. If the wheels are max 60, I wouldn't exceed it.
Here's the spec sheets for the brand of wheels I have on my Roo - http://hispecwheel.com/pdf/Series04.pdf

The reference I made in my previous post about air pressure being dependent on the valve stem can be referenced in the "Pressure Rating" section in this PDF.

Thanks
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Old 07-08-2010, 01:17 PM   #9
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My thoughts

You are talking about max tire pressure is one thing.
You talk about tire pressure related to your trailer weight.

Now consider the proper tire pressure related to your trailer weight and a smoother softer ride for your dishes and stuff in the cabinets.
Over inflated or max pressure will only be a harder bumpier ride for your trailer.
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