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Old 03-10-2014, 05:26 PM   #1
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Smaller tires on same wheels question

Howdy all,

We need to replace our tires due to excessive cracking and since we bought the trailer used we have no idea just how old the tires are.

So here's the question, we currently have Maxxis ST185/80D13 and would like to go to Greenball ST175/80R13 that I can get from Costco. So can I do this on the same wheels? Greenball doesn't have an ST185

Yes, I know that we lose some weight capacity by going with the smaller tires but we are not even close to the loaded capacities (yes we have been to the scales). And I know I shouldn't go cheap on tires because of how important they are. But from things I'm reading Greenball Radials are pretty good.

Any input for or against is appreciated. I value the honesty and the opinions of this forum and that is what makes it a great forum.

Thanks, Ted

Ted, Shelley, Kacie & 11 year old Yellow Lab Spunky
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Old 03-10-2014, 06:02 PM   #2
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How much is "some" weight capacity loss? You can check the age of the tires by the dates on the sidewall--should be a marking that has 4 digits in it, like 0402, meaning the 4th week of 2002. But, if cracks are showing, yes it is time to replace.
Outside of not getting close to the weight rating of the tire, it should be fine to use the new size.

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Old 03-10-2014, 08:39 PM   #3
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Well, just ordered new wheel/tire combos from etrailer.com this evening with the original size tires and wheels Looked on the side of the tires and found the date code of 1305 on three of them and 1005 on the fourth telling me they may have been the originals to the trailer. Wow, did we get lucky we didn't have any issues. I plan to use the old wheels/tires for winter storage and hopefully this will help the new tires last longer. Ended up with Loadstar St185/80d13 Tire W/white Wheel. Looking forward to getting them and getting them installed.
Ted, Shelley, Kacie & 11 year old Yellow Lab Spunky
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Old 03-10-2014, 08:57 PM   #4
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Google Online Tires. They are in Calif. Better pricing and you can get terrific pricing on Aluminum wheels from Rec Stuff.
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Old 03-12-2014, 08:50 AM   #5
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Most tire makers will publish the rim width range acceptable for their tires by size. So you need to know your wheel width.

Make sure the load is sufficient (obviously) and realize you are putting a smaller tire on, so less contact patch for stability and brakes.

Also, you are not changing to a larger aspect ratio (the /80). This is the sidewall height as a function of the width. So a 185/80 is a taller tire than a 175/80. Your sidewall will actually be lower and the overall diameter of the tire is smaller. That means more RPM at a given MPH. Also changes in brake balance and a slight change in the height of the whole trailer, but probably not enough to notice.
You will likely see the difference in the tires, though. It won't "fill out" the wheel/fender as well.
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