Which Tires Are The Right Size For 1970 Single Axle Airstream Trailer

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Question:

hello ... i have purchased a 1970 single axle 23ft airstream safari with new tires and wheels 6 bolt .... the tires are Commodore ST205/75R15 .... my concern is that they state weight at about 1820lbs .... the dry weight of the trailer is apprx 3400lbs ...... did someone sell the previous owner the wrong tires as this rig will probably be low 4000lb when loaded ..... thanks for you help ....roy

asked by: Roy M

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Expert Reply:

You will want to check your Airstream axle out and make sure it has the weight capacity of 4,000 lbs as you mentioned. The capacity should be on a plate or sticker on the axle, or you could use the VIN and call the manufacturer for that information.

If you find that the axle has a higher weight capacity than the 3640 lbs your tires provide, you may wish to replace the tires with a load range D tire like the Karrier ST205/75R15 Radial Trailer Tire, part # AM10245. This tire has a maximum load rating of 2,150 lbs at 65 psi. This tire will fit 15 x 5, 15 x 5-1/2, 15 x 6, and 15 x 6-1/2 rims, and has a 6 ply rating.

If you wish to replace the tire and wheel, and find that you have a 6 on 5-1/2 bolt pattern, I recommend part # AM32664, which is the Karrier ST225/75R15 Radial Trailer Tire with 15 inch White Wheel, or part # AM32666, which is the same tire mounted on a galvanized wheel. Both of these tires have a capacity of 2,540 lbs at 65 psi.

Simply upgrading the tires will not increase the load capacity of your axle.

expert reply by: Jeffrey L

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Answer 1

Typically, you'll want to use trailer tires only on a travel trailer but the exception would be some of the larger sizes, like 15 or 16 inch. It's fairly common to use Light Truck tires for the larger sizes because they're…

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Answer 2

An ST205/75-15 trailer tire will fit on 15 x 5 to 15 x 6-1/2 inch wheels but will not fit a 15 x 7 inch wheel. Wheel width is not the overall width. It is the width where the tire sits, bead seat to bead seat. So if you are measuring the overall…

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Answer 3

While we don't have any way of knowing what brakes you need on a 1970 Airstream International Land Yacht Trailer, I can tell you how to determine the correct ones. You need to know the size of your drum, which will point you to the correct…

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Answer 4

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 5

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 6

You can add larger wheels and tires to a trailer as long as you have enough room for the larger size. The main clearance issues we find when putting larger tires and wheels on a trailer is from the top of the tire to the fender and from the inside…

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Answer 7

Tire designations ST205/75D14 and ST205/75R14 are both for special trailer tires with a 205mm width, 75-percent aspect ratio and that fit a 14-inch wheel. The difference between them is the tire's type of construction. The ST205/75D14 tire is a…

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Which Tires Are The Right Size For 1970 Single Axle Airstream Trailer

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