Great Lakes 4x4. The largest offroad forum in the Midwest - View Single Post - 13, 14 or 15 inch tires on a trailer?
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Old March 4th, 2007, 06:52 AM   #14
whiterhino
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Join Date: 03-07-06
Location: Davisburg MI
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Did a quick search. Found the state police inspection sheet. Look in section D. States brakes on all wheels if 5500 pounds. I haven't found the actual law.

http://www.michigan.gov/documents/TR-54_38480_7.pdf

I also found several rv and boat sites that state brakes are required over 3000 pounds.

As far as the tire size, I would go with the 15". Keep in mind that the actual trailer deck height is only 1" higher with a 2" taller tire. I have had my share of trailer tire issues over the years. Personally I don't like radials because of the sway. They are also visually harder to determine if they are low on tire pressure when doing a simple walk around inspection during fuel stops. I never get anthing but "D" rated bias now.

And like the other guys said, larger tire equals slower revolutions and cooler bearings.

just my .02
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