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When you’re putting in long highway miles or towing through summer heat, this combo is built for the job. The Karrier S-Trail radial tire is Load Range D (8-ply rating) with a maximum load of 1,220 lbs at 65 psi and a speed rating of M (81 mph). The 12" x 4" aluminum wheel is rated for 1,520 lbs and meets DOT specifications, giving you confidence in performance mile after mile.
This wheel keeps things light without sacrificing durability. The aluminum AM01 series construction is rustproof and protected by a clear coat on both sides to guard against scuffs and scratches. Steel inserts in the lug nut wells help keep the wheel snug on the hub and prevent wear in the mounting holes, so it stays secure and looking good over the long haul.
Kenda’s computer-generated tread design and full nylon plies deliver steady traction and stability whether you’re running dry pavement or rain-slick roads. Double steel belts reinforce the tread for even wear and long life, while radial construction helps absorb bumps for a smoother ride that tracks straight behind your tow vehicle.
Because it comes as a complete tire-and-wheel assembly, you can bolt it up and get rolling fast. The combination of a 5 on 4-1/2 bolt pattern, 0 offset, and 3.19" pilot diameter makes fitment straightforward. With its balanced build quality, dependable load ratings, and corrosion-resistant finish, this setup is made to perform season after season without extra fuss.
Kenda backs this tire with a 1-year worry-free guarantee—if it’s damaged within the first year, it’s replaced at no cost. That peace of mind adds one more layer of confidence every time you tow out for another trip.
1. Count the lug holes
Look at the wheel hub or the back of the wheel and count how many lug holes there are(also called bolt holes).
Common configurations include: 4-lug, 5-lug, 6-lug and 8 lug
2a. For even lug counts (4-lug, 6-lug, 8-lug)
Measure from the center of one lug hole directly across to the center of the hole opposite it.
Common configurations: 4 on 4", 6 on 5.5", 8 on 6.5"
2b. For odd lug counts (5-lug)
Measure from the center of one lug hole to the outer edge of the hole directly across (not center-to-center since there's no directly opposite hole).
Common configurations: 5 on 4.5" (most popular), 5 on 5", 5 on 4.75", 5 on 5.5"
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody, Andy here with etrailer.com. Let's take a real quick look at this Kenda Karrier ST145/R12 Load Range D S-Trail Radial Trailer Tire with 12-inch aluminum wheel. Now, this tire and wheel assembly is gonna be ideal for your trailer. This special trailer tire or ST tire has double steel belts and full nylon plies for superior function and long life. The computer-generated tread design and premium rubber compound materials are gonna give you superior traction in wet or dry conditions. So again, this is an ST tire or a special trailer tire, and this is designed for trailers only and not vehicles.
So as I mentioned at the beginning of our time together and as we have stamped here on our tire, this is an ST145/R12. The section width is 5.8 inches, and the outer diameter when fully inflated is 21.4 inches. And this is a load range D, meaning it has an eight-ply rating. The maximum load is 1,220 pounds at 65 psi. And this has a speed rating of M, indicating the maximum speed of 81 miles per hour.
Now, this black aluminum AM01 series wheel is durable. It's lightweight, it's attractive, it's rust proof, and the the clear coat finish on the front and the back is going to protect it from scuffs and scratches. And as you can see here, this features this spoke design here with a machined face, so it's really gonna look great on your trailer. And this also features steel inserts in the lug nut wells to help keep the wheels securely in place on your trailer hub, preventing the holes from wearing down, eliminating the need for constantly retightening your lug nuts. And the dimensions of our wheel, looking at the diameter first, measuring bead seat to bead seat is 12 inches.
And the width of the wheel is four inches. And our bolt pattern is five on 4-1/2 inches. And in case you don't know, the first number in the bolt pattern is the number of bolt holes and the second number is the diameter in inches of the circle on which the bolt holes sit. So to determine the bolt circle diameter on wheels with an odd number of bolt holes as we have here, you simply measure from the center of one bolt hole to the point halfway between the two bolt holes directly across from that first, and you'll get that measurement. The capacity of this wheel is 1,520 pounds.
The wheel stud size is a half an inch by 20. The center cap is sold separately, but if you decide to pick one up, you just wanna make sure that it fits the pilot diameter of 3.19 inches. And this assembly does meet the Department of Transportation specifications. Well, I think that's gonna wrap up our look today. I do hope that our time together has been helpful for you. Again, my name is Andy. Thank you for joining me.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Robert
7/3/2026
Product is great and its a much safer feeling having the load range D tires and 81mph speed rating vs the original B range and only 65mph speed rating!
Mike L.
9/11/2026
They look great Paul, thanks for the photo!!
Mike L.
7/14/2026
Those look fantastic, Alex! I installed aluminum wheels on my PWC trailer several years back, and it makes a huge difference!!
Gwendolyn Y.
5/12/2026
The new rims look awesome on your trailer! Thanks for sharing the photo!
Gwendolyn Y.
5/4/2026
That's a sweet boat you got, Samuel! Now you're ready to get on the water and enjoy the sun!
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Lazer S.
7/28/2026
They definitely look good on there, Jeff! ^___^ Are you pulling this behind a motorcycle?