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Radial tire with automotive-grade tread has an 8-ply rating and a 1,220-lb max load at 65 psi. 12" x 4" Steel wheel has a 5 on 4-1/2 bolt pattern and a corrosion-resistant galvanized finish. Beveled stud holes keep wheel secure.
Features:
Specs:
This tire has a 1-year worry-free guarantee. If within the first 12 months the tire is damaged in any way, it will be replaced at no charge.
Unlike standard trailer tire tread, which has solid, continuous ribs, the automotive-grade, computer-generated tread on these Karrier S-Trail radials has ribs with breaks. These breaks allow water to run off to the sides. The Karrier S-Trail tread also has sipes. Siping is a process in which thin grooves (or sipes) are cut into the rubber of the tire. The grooves channel water away from the tread so that the tire makes better contact with the road. Both of these features greatly improve traction during wet, snowy, or icy conditions.
Karrier S-Trail radials are constructed with double steel belts and full nylon plies for increased durability and endurance. The premium rubber compound materials of this tire help disperse heat.
The stud holes on this steel wheel are beveled to ensure that the wheel stays tight against your trailer hub. This also eliminates the need to constantly retorque the lug nuts.
Radial ply tires are designed for trailers that are towed on the highway. The cords on a radial tire are positioned at a 90-degree angle to the direction of travel so that they lay across the width of the tire from wheel lip to wheel lip. This construction prevents the cords from rubbing against one another when the tire flexes, unlike the cords on a bias ply tire. As a result, radial tires have less rolling resistance and heat buildup, which leads to a longer tread life and improved steering at higher speeds.
Determining the Bolt Pattern
The first number in the bolt pattern is the number of bolt holes. The second number denotes the diameter, in inches, of the circle on which the bolt holes sit.
To determine the bolt-circle diameter on wheels with an odd number of bolt holes, measure from the center of any bolt hole to the point halfway between the two bolt holes directly across from the first. (Example: "5 on 4-1/2" means 5 bolt holes with 4-1/2" measured to a point halfway between the opposite bolt holes.)
On wheels with an even number of bolt holes, measure from the center of one bolt hole to the center of the hole directly across from it. (Example: "8 on 6-1/2" means 8 bolt holes with 6-1/2" from the center of one hole to the center of another on the opposite side.)
Measuring the distance from the center of one bolt hole on the wheel to the center of a bolt hole right next to it can also help to determine the bolt pattern.
Very happy with this purchase. I previously had 8" trailer rims/wheels and really wanted to upgrade to larger tires to accommodate the extra weight I have added to my small boat. But, I am not a handy guy and really didn't know what I was doing. In other words, I know how to fish but know zero about boat trailers. So, I spoke with etrailer support Tech Paula who walked me through the process in detail and waalaa, done!
Rims are great and tires are just what i needed! Fast ship and good follow thru to the door.
Gwendolyn Y.
5/15/2025
The new rims look great, Eric! Is that a jet ski trailer? Please correct me if I'm wrong :)
Gwendolyn Y.
5/26/2025
Great rims and tires for my jetski trailer. Just what we needed, super fast shipping as a bonus!!!
Great tire. I have it mounted on my trailer as a spare.
Brooke M.
5/13/2025
Sweet! Is that a jetski I see? Headed to the lake anytime soon?
Great customer service advising shipping information. Received on time. Excellent tires and rims. My trailer companies Go To.
Arrived in perfect condition. Happy to have some radial tires I can confidentiality drive at highway speeds with.
Brooke M.
7/10/2025
Definitely! Radial is the way to go in my opinion. What kind of trailer are these for?
Brooke M.
7/11/2025
Great website. Excellent products. Tires/wheels arrived in 2 days. Recommended
Gwendolyn Y.
4/11/2025
The new wheels looks great on your trailer!
Bought this as my spare on a dial key ski trailer. Haven't had to use it yet but I can tell it's eager to jump into action if either of the main tires fails. It just sits there on its mount longing to do its job. Every so often it twitches and gives me that "now?" look but I have to tell it "easy there fella. The others are doing fine" so it gives a look of disappointment and a little sigh but it still remains willing and able.
Gwendolyn Y.
6/24/2025
When the time comes it will rise to the challenge with honor and dignity.
Just got both of these tires. Shipping was painless and quick. I screwed up and ordered 1 tire, but ordered the 2nd one the next day. Got one tire on Thursday and the other one on Saturday. Immediately put these on my boat trailer as the bias ply tires were freaking me out lol. Will be testing them out tomorrow, by going to a lake thats 30 minutes away via highway. Sure will be nice to go at highway speeds instead of having to keep it below 70. Really liked that the tires were pre-inflated to 64 psi. They look really sturdy and are bigger than my old bias plys. Definitely recommend upgrading to radials for the peace of mind.
Perfect upgrade over other tires and rims, these new tires are of a much higher quality than my old Carlilse brand tires. I got a larger tire and wheel that fit on my existing hubs. I have made several purchases from etrailer, and never unhappy with my purchase.
Easy ordering process. Tires showed up looking nice. Easy smooth process. Recommend.
Kevin 
4/11/2025
Excellent no issues.
I wish I got radials sooner. Great looking up-grade. Much wider with great thread design. Load range D and increase load capacity is significantly higher then LR C’s Delivery was very fast with great tracking and knowledgeable salespeople to answer any questions. Always happy with etrailer products.
I purchased these tires to replace the 5 year old tires on my malone microsport trailer.I plan on driving from MA to SC and i found that the AM31202 HAS THE BEST OVERALL rating for 12" tires for driving on highway for long distance, and e trailer ,has the best prices and the galvanized coating was prefect, i have purchased many items over the years from e trailer , every purchase was perfect. The employees know there stuff , and sell high quality products., and shipping was fast.
These tires cost more but these tires are 8 ply load range D radial tire which have a higher rating on the weight capacity with a updated tread design. The galvanized wheels are a must for any boat trailer being put into salt water and fresh water in the area of the world I live in. Time will tell but the set up looks as it will hold up to years of repeated use. The tire & rim set up balanced easily on my old style bubble balancer I use in my shop. You get what you pay for...
Gary
2/9/2025
My Kenda trailer radials ST145R12 are still giving me piece of mine as the Texas heat is unforgiving. I am glad I purchase them for my trailer. This is not just another tire store they have answers.
Jerred H.
2/9/2025
fast shipping , installed tires/wheels on trailer yesterday ,have not had opportunity to take boat out yet but the upgrade to M speed rating , D load range and bias ply to radial can only be great!
Installed these on my Load Rite K1000-2T. They fit perfectly and there's no need to adjust the fenders. I do alot of long distance highway driving when I go fishing. I think they'll work out much better than the stock 4.80-12 bias plys.
Jd
5/18/2024
After one year, the tires are holding up just fine. Gladi made the switch
My wife & I are leaving fo our Western NY Home traveling on Rte 75. Driving at 70 mph, so these radial 12", 8 ply trailer tires should hold up for this 13 hr drive. I'm always worried towing and 12" wheels heat up at high speeds. Really glad you had these tires & wheels in stock & able to ship them in a couple days. I had 4 year old bias ply C rated tires on my trailer but I didn't trust them for the speed & distance I'd be traveling.
As with my order last week service was excellent, delivery was just as prompt as my order last week. Impressive operation. Thanks to all involved.
Haven’t had them in salt water yet but great fit on my trailer and love the lower height. Wonderful service and fast delivery to my front door.
Nice radial tire and rim combo for my small boat trailer.
I'm glad to see I have an option to garbage bias ply 4.80x12 trailer tires. I've tried a lot of them over the years and always the same result, poor quality, ride, and terrible tread life. My last set of bias plys on a 2 ski pwc trailer were already down to the wear bars in a year and maybe 1000-1200 miles.
Ordered these galvanized wheels and kenda radials and as always etrailer got them here very fast and well packed. Took them to my local tire guy and he balanced them. Didn't take much weight and watching them spin showed a straight rim and tire. Installed them and was shocked the first trip to the river. Zero vibration from the trailer! Bias plies seem to bounce and transfer it to my truck through the hitch. These tires are smooth, no trailer bounce, pull great, and I don't see my yamahas vibrating in the rear view mirror.
Fast forward a few months till now. I probably have 5-600 miles on them. Still perfect, zero air loss, zero tread wear noted. I will buy these from now on based on what I'm seeing so far.
Tire is fine but rim looks like a unsupervised 2 year old got hold of a spray can and painted it. The galvanizing has awful runs. I know this is isn't the most expensive tire/wheel but does anyone take any pride anymore?
Katrina D.
7/13/2023
Unfortunately, this is very common for these galvanized rims. They are dipped into molten zinc and are drip dried. This will sometimes cause bubbles and or rough marks on the rims, you can sand it down to make it smooth.
After one year I am pleased to say the tires have performed very well. I was glad to have found them and was pleased with seller during purchase.
Fantastic price, great selection, and free shipping to boot. I needed new tires for a long ATV trip and wanted a spare tire as well (I know, I know, but I usually only trailer locally). I ordered these radial tires and rims pre-mounted which allowed me to use one of the old wheels as my spare. Everything performed flawlessly over about 600 miles and even held their torque specs when I checked them during and after the trip. The spare tire carrier compliments the galvanized trailer frame and rims and looks like it will hold up to the elements of the North East. All in all, I highly recommend these products and etrailer.
Haven't installed and used the tires yet, but the order and shipping was fantastic. I ordered on Wednesday and received on Friday... 48hours. I am using the tires to pick up a pontoon boat in South Carolina and tow it to Florida... I will update after the trip if I have any problems, but if you don't see any more from me, that means it all went fine and I am out boating :-)
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Kelly
8/15/2025
Still working great after a full year of road travel to and from the boat launch