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Topic: Load Range for Tires

Posted By: mycopsycho on 03/04/10 10:47am

I'm looking for some advice about a preferred load range for trailer tires. I have a 2007 22ft Bigfoot trailer with tandem axles. The trailer loaded weighs about 5500#. The factory equipped Marathon tires are C rated. I have to replace at least two of my trailer tires as a result of my axles being out of alignment...from the factory. Have had that fixed but I blew through two tires in the process. Anyway, I'm thinking D rated tires might be best as replacements for all four tires on my trailer and just keep the two good C rated tires as emergency replacements for an upcoming trip to Alaska this summer. Any thoughts about preferred load range on trailer tires?

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Posted By: Gale Hawkins on 03/04/10 11:05am

I would move up personally if your wheels can be fitted with the Class D load range tires.

Posted By: Center Pin on 03/04/10 11:23am

If your rims are rated for it absolutely upgrade, the cost difference is not much.

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Posted By: RRUGG on 03/04/10 01:42pm

Having more tire capacity is in the same category as having more truck capacity IMO.

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Posted By: david_42 on 03/04/10 02:10pm

Right now you have less than 1400 lb on each tire. 14 inch load range C tires run around 1800 max.load. Sounds like you have a huge safety margin already.

Posted By: skipnchar on 03/04/10 02:26pm

C rated tires will MORE than handle your trailer weight and there is really no REASON you'd need more. My 8,000 lb. Rockwood has C rated tires and so far I've had two sets of tires on it. Both were C rated and the first lasted 45,000 miles (goodyear Marathons made in New Zealand) and the second Maxxis now has 35,000 and is still going strong. I've had one puncture flat that was repaired, on the Marathons. Keep the inflation at maximum, check if often and keep speeds to a reasonable 65 or 70 MPH.
Good luck / skip

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Posted By: mycopsycho on 03/04/10 02:53pm

david_42 wrote:

Right now you have less than 1400 lb on each tire. 14 inch load range C tires run around 1800 max.load. Sounds like you have a huge safety margin already.

Forgot to mention that I have 15 inch tires on my trailer. I appreciate the comments so far.

Is there some place on the rims that I can check to see if they would handle D rated tires?

Posted By: coolbreeze01 on 03/04/10 04:54pm

There may or may not be a psi rating on your rim. I couldn't find a rating on my aluminum rims, even dismounted, so I put on load range E tires. More tire than I need, and that's what I want.

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Posted By: david_42 on 03/04/10 04:54pm

Most of the time there are no markings on the wheels.

Posted By: JIMNLIN on 03/05/10 06:59am

I'm not of the more tire is better thinking. You can have too much tire for a trailer. I agree with others that the C load range has plenty of sidewall strength for your small trailer. Moving up to a D requires a 65 psi rated wheel.

Your problem IMO is tire reliability. Their are several LT235/75-15 C load range tires out there that will give you years of ST tire related issue free use. If you want to move up to a D the Goodyear Wrangler LT215/75-15 D will make a great upgrade from any ST brand. Their not restricted to 65 mph as the ST tires are. Maxxis makes several sizes of 168 Bravo 15" LT commercial grade tires. Check them out.

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Posted By: mowermech on 03/05/10 09:44am

JIMNLIN wrote:

Moving up to a D requires a 65 psi rated wheel.

"requires"? Why?

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Posted By: JIMNLIN on 03/05/10 11:58am

mowermech wrote:

JIMNLIN wrote:

Moving up to a D requires a 65 psi rated wheel.

"requires"? Why?

OK. We've been through this before but for the benifit of folks new to tires used on trailers I'll post this again.

Goodyear trailer tire pressure recommendation says :
Special Considerations

" Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up."

We are talking about tires used on a trailer.
If the OP is going to the trouble of uprating a tires load range why shoot youself it the foot by installing a tire on a trailer that you can't use max tire pressure. The tire will run hotter than without max pressure. Running hotter than need over time can shorten a tires life.

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