Parts Needed to Upgrade to a Larger Trailer Tire

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Question:

I’m looking to upgrade the tires and rims on my pop up camper and was wandering if it would be beneficial to go from 12” to 13”? I currently have 2 1/4 inches of clearance in both front and back of the tires and 1 1/2 on the inside of the tire against the fender well. My current tires are 5.30-12 Duro Class C on 4 by 4 bolt pattern. If I should stay with the 12” tires, which ones do you recommend? I’m looking to purchase the black Dextar rims on your website. If I purchased tires and rims, can they be mounted before being shipped?

asked by: Chase

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Expert Reply:

To install a larger 13 inch tire and wheel combo like the Kenda Karrier # AM31952, you will need to get more room for the wheels. With your current tire having a diameter of 21.9 inches and a width of 5.6 inches, these would be quite a bit larger having a diameter of 24.1 inches and a width of 7 inches. You want to keep the side wall of the tire and the wall of the fender somewhere around an inch or inch and a half, but this is not as important as the height. You want to have a minimum of 3 inches from the top of the tire to the bottom of the fender while under load. With your current tires being 2 1/4 inches from the fender currently, you will need to gain roughly 5 or 6 more inches to upgrade to a larger tire.

This is something that may be able to be done though. First, you will need to check to see if your leaf springs are above or under the axle. Typically they are above them and an Over Under Kit like the Dexter # K71-384-00 can be used. This is for a 2 3/8 inch axle, but you will want to measure yours to make sure of that. This will get you 2 3/8 inches of lift already.

Second, you can replace your current hangers with something taller. The tallest ones we currently have are the Redline # 115919 at 5 7/16 inches from the top to the center of the bolt hole. The lift on this will depend on the measurements of your current hangers, however.

Lastly, you can install a hanger lift kit. We do not have one specifically for a single axle trailer at the moment, but we do have all the parts needed to piece on together, which I have listed below:

# LC84PJ - Equalizer Plate
# LC34UD - Hanger Spacer
# LC44UD - 9/16 Lock Nut
# LC64UD - 9/16 Washer
# LC74UD - 4 x 9/16 Grade 5 Bolt
# LC94UD - 2 7/8 x 9/16 Shoulder Bolt

As these are single pieces, you would need eight of the # LC64UD and # LC44UD, but four of everything else. Doing this would add approximately 2 more inches of lift to the trailer.

expert reply by: Lazer S

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Answer 1

Generally speaking, it is not a huge deal to upgrade one size (12" to 13") so long as you have clearance but the other thing to make note of is the surface area on the hub. If you have a 2,000 lb trailer axle then your hub is likely only…

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Answer 2

Typical spring deflection for trailer leaf springs like the part #e34SR is right at 1-1/2 inches when at capacity.

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Answer 3

The replacement leaf spring that I have available to fit your 6,000 pound axle is the 5-Leaf Double-Eye Spring, #e34SR. This spring measures 25-1/4 inches long by 1-3/4 inches wide. In order to ensure proper traction and a safe, level ride, we…

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Answer 4

A much easier way to determine what replacement leaf springs you should be using on your trailer would be to first determine what the total weight of your trailer will be and then pick springs that are confirmed to be able to handle that weight. For…

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Answer 5

We have a handful of 6K leaf springs, like the part #e94SR you were looking at, that could potentially work for your Montana High Country but I'll need you to measure the distance from the center of one eyelet to the center of the other eyelet to…

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Answer 6

To lower the nose of your trailer you can try lowering the head of your hitch and also you could raise the pin box of your trailer into a higher set of mounting holes which would have same effect. We also have lift kits for trailers like the Correct…

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Answer 7

It does sound like you have found some clear damage to your 5th wheel trailer's leaf springs that will require attention. Uneven tire wear can be caused by a number of things - incorrect pressure, inadequate weight on the axle or a visibly…

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Answer 8

I attached a chart that has all of the arm positions explained for the B and W Companion Hitch part #BWRVK3500 that you have. The horizontal position really comes down to cab clearance. Most people are find with the arms located forward which allows…

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Answer 9

I attached a picture that has all of the available positions you can use for varying heights with the B and W Companion hitch part #BWRVK3305. It's best to measure first to determine which height you'd need, but if not then I'd go with…

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Answer 10

The height adjustment for the B&W Companion #BWRVK3300, which is a confirmed fit for your 2017 Ford F-350 Super Duty long bed with puck system, is actually pretty simple. The arms that the head of the Companion sits on have a slight slant to them…

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Answer 11

Having the head of a B and W Companion like the #BWRVK3500 positioned with the pivot arms in the middle most horizontal and vertical setting would give you the most neutral position that should work the best for most trailers under most…

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Answer 12

I went out to our warehouse to measure the Trailair Rota-Flex Pin Box, #LC328330, and found that the width is 12 inches. When measuring the length of a pin box, you want to find the distance from the center of the king pin to the bolt holes. The…

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