Weight and Speed Ratings of Trailer Tires
Question:
i have a kayak trailer that was modified FROM a jetski trailer, so i dont know the make of the trailer. I would like to replace the wheel bearings. any suggestions on how to determine the correct part. also, which determines speed limitations, axels or wheel size
asked by: Lin
Expert Reply:
The very best way to know the correct replacement bearings to use on any trailer is to pull one hub and remove its inner and outer bearings. The part numbers on those bearings are pretty much the most fool-proof way to identify new ones. Since your trailer has been modified it is possible that at some time in the past its spindles, hubs or axles were changed so pulling a hub, although a bit messy, is the very best way to go. You can refer to the photo I linked for you that shows the usual appearance and placement of part numbers on bearings and seals.
I also linked two helpful articles, one of which lists the most popular bearings based on axle weight rating. You may be able to find a sticker or plate on your axle that tells you its weight rating. The other article explains how to re-pack the bearings with fresh grease and re-install the hubs.
Axles themselves have weight ratings but not speed ratings. Same for hubs and wheels. But trailer tires DO have both weight and speed ratings.
For example, the Kenda ST175/80R13 Radial Trailer Tire # AM10210 has a weight rating of 1610-lbs at its inflation pressure of 65-psi. This weight rating is classified as Load Range D. This tire also has a speed rating of 81-mph maximum. This speed rating is classified with the letter code M. So this particular tire has a load rating D and a speed rating M. I also linked a helpful article concerning trailer tires.
If a trailer tire we sell does not indicate a speed rating that means it defaults to a 65-mph rating.
Product Page this Question was Asked From
Karrier ST175/80R13 Radial Trailer Tire - Load Range D
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range D
- 175/80-13
- 13 Inch
- M - 81 mph
- Kenda
more information >
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