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Trailer Wheels, go up a size?

Old 06-10-2019, 01:07 PM
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Default Trailer Wheels, go up a size?

Hi guys, I have trailer questions:

I have a 1989 25ft whitewater with twin 200s. It sits on a dual axle trailer that was "made for the boat" back in 1992 (ish). The trailer honestly looks a little small under the boat to me (but what do I know lol). It has 205/75/14 (6ply) load range C tires on it now, the rear tires look a little stressed and supply of 8 ply (D) trailer tires for 14 inch wheels is a little limited out there. I'm getting ready to replace the hubs and tires but have been contemplating putting 15 inch wheels on it. Have any of you guys out there with heavy, old center consoles and old trailers went with bigger wheels for these reasons? Would it make a positive difference or will I be wasting money? What tires are you running?

Old 06-10-2019, 01:08 PM
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You are on the right path. Go 15" D rated and get piece of mind.
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Old 06-10-2019, 01:44 PM
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Originally Posted by JAGSARE1 View Post
You are on the right path. Go 15" D rated and get piece of mind.
Yep, better the ply the better weight carrying capacity. Air them up all the way and less heat on the tires too.
Old 06-11-2019, 05:09 AM
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I can envision fender clearance issues. And while increased capacity tires may give some sense of security, they will not increase the axle weight rating. Get the whole rig weighed then you will have more information for making decisions.
Old 06-11-2019, 05:52 AM
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You will have a better selection of trailer tires with 15" wheels.

As pointed out, keep in mind that your axle weight rating is not going to change. It looks like you have 3500 pound axles with five bolt hubs for a total capacity of +/- 7000 pounds. Seems light for your boat.

I changed my six lug 15" wheels to 16" wheels so that I could use light truck tires instead of trailer tires. I bought a set of Michelin XPS rib tires and they are so much better than any trailer tires I have ever had. It was a pricey move, but so far it seems well worth it. The trailer is a lot more stable on the highway, tracks better, and I think light truck tires will last much longer. (My trailer has 5200 pound axles.)
Old 06-11-2019, 06:33 AM
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Originally Posted by doyall View Post
I can envision fender clearance issues. And while increased capacity tires may give some sense of security, they will not increase the axle weight rating. Get the whole rig weighed then you will have more information for making decisions.
A 205/75R-14 is 1 inch shorter than a 205/75R-15, so maybe
Old 06-11-2019, 06:50 AM
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My Sailfish 2360 CC with twins has 225/ 15s e rated on my Owen's Trailer...no issues and will run less stress as tires will rotate less than 14 inch wheels and more plys... Good Luck
Old 06-11-2019, 06:56 AM
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I just did this on my triple axle. The 14" tires seemed just good enough for the weight of the boat. I put on a 15" tire and increase the load capacity about 700lbs per tire. The clearance in the fender well is much tighter but I can still get a finger between the rubber and the fender and does not rub when towing. It pulls a bit smoother too.
Old 06-11-2019, 07:00 AM
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Carlisle makes a load range D tire in your size. Rated for 65 psi, 2040 lb/tire load capacity. Radial Trail HD is the model and has a higher speed rating than standard ST tires. I bought a set over the winter and will see how they perform this year.
http://www.carlislebrandtires.com/ou...adial-trail-hd

Last edited by Cobia 217; 06-11-2019 at 09:39 AM.
Old 06-11-2019, 07:53 AM
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go to a 70 tire instead of a 75 would accomplish the same thing
Old 11-14-2019, 11:59 AM
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Will 15s (or larger tired than what one has Im trailer currently) help out with mileage a bit when towing?
Old 11-16-2019, 02:06 PM
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i guess my question would be what axles do u have?
Old 11-18-2019, 05:38 PM
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Originally Posted by doyall View Post
I can envision fender clearance issues. And while increased capacity tires may give some sense of security, they will not increase the axle weight rating. Get the whole rig weighed then you will have more information for making decisions.
You're 100% correct. But in my specific case, when I increased from 15's to 16's, it solved my tire issues 100%. Never had another blowout. To your point, I did have to adjust my fenders. When I bought a new trailer this year, I spec'ed 16" E rated tires. My axles were rated just fine, it was the tires that were the weak link.
Old 11-19-2019, 06:17 AM
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To me it looks like fender clearance may be an issue, Goodyear makes the Endurance trailer tire in 14” Load D, that would be my recommendation. Only trailer trie made in the USA and it’s gotten great reviews. You can use the 215/75r14 instead of the 205 tire. The 215 is rated at 2200 lbs each.
Old 11-19-2019, 06:24 AM
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Originally Posted by simeoncoleman View Post
A 205/75R-14 is 1 inch shorter than a 205/75R-15, so maybe
but you only need 1/2 inch for clearance
Old 11-19-2019, 06:39 AM
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Originally Posted by Windwood View Post
but you only need 1/2 inch for clearance
He's got sufficient room to raise the fenders if he needs to w/out fear of contacting the chines. An inch or so would easily do the trick.
Old 11-19-2019, 07:11 PM
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Originally Posted by Windwood View Post
but you only need 1/2 inch for clearance
what makes you think 1/2” for clearance, I’m pretty sure wheels can bounce up more than 1/2”. Most trailer manufacturers recommend 2”-3” with less maybe ok but I think 1/2” is a little short.
Old 11-19-2019, 08:12 PM
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Do you even have tire to fender clearance to go the extra height of a 15" tire?
Old 11-19-2019, 08:46 PM
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4" of clearance is normal.
Old 11-20-2019, 05:34 AM
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Originally Posted by leonreno View Post


what makes you think 1/2” for clearance, I’m pretty sure wheels can bounce up more than 1/2”. Most trailer manufacturers recommend 2”-3” with less maybe ok but I think 1/2” is a little short.
You already have a 14, a 15 is only 1/2 inch bigger all the way around. If you already have X for normal clearance, you will end up with X- .500 for you adjusted clearance.
That is based on having the same sidewall and width which was already confirmed by the op.

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