Can I Increase From Load Range B to Load Range C Tires

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Question:

I have F 78 -14st tires on my boat trailer load range B would it matter if I got a load range C

asked by: Jim H

1

Helpful Expert Reply:

If the B rated tires have a high enough capacity there's no reason you need to go with a C rating but there's also no reason you can't. It won't hurt anything.

The F78-14 size is the same as today's 205/75-14 metric size. For C rated tires in that size I recommend # TR20514 for radials or # AM1ST86 for bias tires. They're both rated for 1,760 pounds at 50 psi.

I couldn't tell by your picture if your current tires are radial or bias. Radial tires have less heat build up and therefore last longer than bias tires although their sidewall isn't as strong. This makes radials better if you're towing mostly on highways but the bias are better for off-road conditions. With a boat trailer I assume you're mostly on-road in which case the radials are your best option.

expert reply by: Charles S

1

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Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

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Answer 6

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 7

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 8

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Answer 9

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 10

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6 inch whereas the 225/75-15 fits widths that are 5 inch to 6-1/2 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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Answer 11

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 12

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Can I Increase From Load Range B to Load Range C Tires

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