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Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E

Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E

Item # AM10140
Our Price: $94.43
Trailer Tires and Wheels
Shipping Weight: 15 lbs
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Radial special trailer tire with automotive-grade tread has a ply rating of 10 and a 1,520-lb max load at 80 psi. Designed for highway use. Constructed of double steel belts and full nylon plies. Fits 12" wheels. Great Prices for the best trailer tires and wheels from Kenda. Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E part number AM10140 can be ordered online at or call 1-800-940-8924 for expert service.
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Kenda Trailer Tires and Wheels - AM10140

  • Tire Only
  • 12 Inch
  • 145/80-12
  • Load Range E
  • Radial Tire
  • M - 81 mph
  • Kenda

Radial special trailer tire with automotive-grade tread has a ply rating of 10 and a 1,520-lb max load at 80 psi. Designed for highway use. Constructed of double steel belts and full nylon plies. Fits 12" wheels.


  • Radial ply tire is great for highway use
  • Constructed with double steel belts and full nylon plies for superior function and long life
    • Premium rubber compound materials help disperse heat
  • Automotive-grade, computer-generated tread has sipes that channel water away from the tire to improve traction during wet, snowy, or icy conditions
  • Special trailer (ST) tire has sturdy sidewalls so that it can handle heavy loads
    • Created specifically for trailers and not intended for use on other vehicles
  • Meets DOT specifications


  • Fits: 12" x 4" rims
  • Tire size: ST145/R12
    • Section width: 5.7"
    • Outer diameter (when inflated): 21.3"
  • Capacity:
    • Load range: E
    • Ply rating: 10
    • Maximum load: 1,520 lbs at 80 psi
  • Maximum speed: 81 mph (speed rating M)
  • 5-Year limited warranty
  • 1-Year worry-free guarantee

1-Year Worry-Free Guarantee

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.

Karrier S-Trail Radials with Automotive-Grade Tread

Kenda Karrier S-Trail Tread Vs Standard Tread

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.

Radial Tires vs. Bias Tires

Radial tire vs bias tire graphic

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.

10140 Kenda Karrier KR25 S-Trail ST145/R12 Radial Tire - LR E

Customer Satisfaction Score:

Customer Reviews

Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E - AM10140

Average Customer Rating:  4.8 out of 5 stars   (2059 Customer Reviews)

Radial special trailer tire with automotive-grade tread has a ply rating of 10 and a 1,520-lb max load at 80 psi. Designed for highway use. Constructed of double steel belts and full nylon plies. Fits 12" wheels.


In our fast paced world where customer service seems to be a thing of the past, I am always amazed when shopping on etrailer. Prompt service, fast shipping and people who actually follow-up to ensure that you are satisfied!

This should be your one stop location for trailer parts.


The tires arrived ONE DAY after ordering them. They look good and I am hoping they will perform better than the 'cheap ass trailer tires' I have been using for years. And they have good service and were helpful when ordering.


Wear like iron! Towed to Arizona in 115 degree heat at high speeds. I expected them to be pretty worn by the time I got back, since the OEM tires were almost toast just going to the Keys and back. The Kenda tires still looked almost new. Now after about 10k more miles. They still look great.


I had a small 4 x 8 trailer that I beefed up the suspension and framework so that I could haul dirt on it I've been hauling dirt on it for a year now with those tires approximately 2500 to 3,000 pounds


I needed a quality set of tires for my 1959 Lil Loafer camper trailer, the only tires I could find at any tire shop local to me were bias ply and nothing over a load range D. So needless to say those would wear out real fast and not track very will. These Kenda radials will fill the need perfectly. A load range E 10 ply rating will give me the confidence I need when hitting the road. I had them mounted at a local tire shop and took it out for a test run and they sure help the little trailer track nice. Great tire for a little vintage trailer.

Delivery was fast as well, less than a week. The price is fair with the exception of the Canadian exchange on the US dollar. And the website works smooth for orders, I'll be back for other stuff for sure.

Doug K.


The tires are performing very well. We have a longer trip planned this summer so that will give them a good run, but I’m sure they will be great.


Got the new tires and had them mounted up. Im glad etrailer had a better small tire for my 5x8 trailer. Ive Had other tire shops tell me 4 or 6ply was the only ply available for the small trailer i had and the farm stores only offered the 4 or 6 ply tire.
Etrailer had 10 ply,radial tires for my need that is rated up to 65 mph on the highway and im very happy. Living on a gravel road, and using the small trailer on the farm i would have flat tires all the time with the old weaker 6 ply tires it came with and they wouldnt last very Long if used them on the pavement.



Still going strong. No flats and tread wear is still doing great also. Id say theres only about 1000 miles on them as i dont use the trailer every day but i did use it on my farm where the other tires wouldnt last long before getting a flat from a cut off tree stump or thorns. I will buy again when needed and have told plenty other people about the tires and where to get them.


The tires were delivered extremely fast and immediately the quality was noticeable. I recommend this brand and this website 100 percent and after running thru 2 brands in one month these tires saved my business. I will not shop anywhere else for my tires


Received tires very quickly after order was placed. E-trailer has never disapointed me yet. Their prices may be slightly higher than other vendors but they more than make up for this with their service.

Robert L.


A+ You cannot go wrong with these tires.


I bought this tire because of its Load Range E rating. It has performed well and I would recommend for any trailer that has tire size physical space constraints, yet needs for a greater load rating.


Great tire !Replaced the same one I had on my trailer . This tire offers a smooth ride . This is the only tires I would buy and has the best ply and speed rating . Definitely recommend .


I am 100 percent happy with the tires and rims, they are exactly what I was looking for. In the last year I have purchased 4 new 6 ply bias tires due to the new tires I had purchased the year before blowing out with a load. I purchased the 10 ply radial tires with the new rims for a new look and better reliability. The trailer pulls great and the tires and wheels handle excellent. These are great products that I couldn't find anywhere else. Thanks etrailer.


After one year, they're still round and have plenty of tread. No leaks. Decent tires.


After two seasons on my tandem axle boat trailer (5100 lb combination) I’ve been very happy with the tires. I have about 5k miles on them and they are holding up nicely. Highly recommend, far better performance than what I got out of the factory supplied tires (tread separated and broken cords after 2 years on factory tires)


This is the second pair of these ST 145/12 radial I have purchased for my vintage 1959 Lil Loafer trailer. After taking the first pair on a couple of short trips I realized I did not have a radial spare, only my old bias ply tires. Since I don't want to mix radial and bias I figured I should buy another pair for spares, (in spite of the exchange rate on the Canadian dollar and the cost of shipping to Canada). Still loving these tires in comparison to the bias ply, we are planning a longer trip still this year so that will be a good test.

Oh, I even reused the packaging to protect my bench top while repacking the bearings.


I love doing business with e trailer . Customer service is exceptional. Eric is a top notch 5 star customer service representative!


I just received the tires today and haven't had them mounted yet so all I can is they look great. Summer before last, we took our pop up camper out West through 18 states in about 60 days. All of our camping up that point had been around Florida where we live, so no long road trips. On our out West trip we had 4 blowouts on our little pop up camper and since we were on the road, we would pick up tire/wheel assemblies from Wal-Mart or Harbor Freight. Did not really know what else to do. Experience has taught us better and that's why I ordered these load range E, 65 mph, 10 ply rating tires. The proof is in the pudding as they say, so in the fall, we will find out how good these tires are and I will write a full review then.



Very happy with these tires. Took another long trip last year, Florida to Maine, back home, then to Alabama, Ga and home. Towed 65 mph. No tire problems at all. What a relief!


Great wearing and dependable tire. Always had issues with nearly new trailer tires blowing out until I switched to these on all four of my trailers, and in thousands of miles have had zero failures.


Got the tire today. Got it mounted. Ready for my trip up north.
It's good!


The tires are gray for my trike. Will not buy from anyone else. Tried other tires but the didn’t last long as the ones I got from Etrailer.

David V.


The tires are in good shape

David V.


The tires are great for my motorcycle trike. They last longer than regular 6 ply tires that is why I use the radials.


This tire worked great and has done a 600 mile road trip.


They look great but time will tell how they hold up. Delivery was next day with free shipping. Can’t beat that service.


Perfect condition
Boxed nicely
3 days early
Thanks guys
Your my go to for sure


Tires look so good. They are very sturdy.
Mounted easily.


Great product and great service.


Fast service and shipping, arrived in great shape.

Show More Reviews

See what our Experts say about this Kenda Trailer Tires and Wheels

  • Do 4.80 x 12 Size Tires Fit the Same Rim as 145/80-12 Size Tires
    Your current 4.80 x 12 tires and the Kenda 145/R12 tires, part # AM10140, both fit on a 4 inch rim so you can use your same rims. However, you want to makes sure you have clearance for the larger tires since they're over half an inch taller and more than 3/4 of an inch wider. You want 3 to 4 inches from the tire tread to the fenders and at least 1 inch between the sidewall and the closest part of the trailer.
    view full answer...
  • What Tire Pressure Should You Set 145R12 Trailer Tires Too
    The max tire pressure rating isn't the same for all 145R12 trailer tires so you'll need to look on the actual tire sidewall for the load range which should also state the max tire pressure rating. We recommend filling the trailer tires to the max tire pressure rating listed on the sidewall while cold. The Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire part # AM10140 for example has a load range e rating with 80 max psi.
    view full answer...
  • Can Kenda S-Trail # AM10140 be Filled to Lower psi Rating to Help With Poorly Maintained Road
    Replacing your 5.30-12 size Bias tires with an ST145/R12 size tire like the Kenda Karrier S-Trail # AM10140 may help a little bit as Radial tires do not have as stiff of a sidewall as Bias tires. I do not recommend inflating the tires to a lower psi rating than what is specified by the manufacturer. The S-Trail is rated for 1,520 lbs at 80 psi so if a lower psi is in the tires then you would be operating at an unknown weight rating and the tires will not perform as predicted by the manufacturer....
    view full answer...
  • What is Recommended Tire Pressure for Trailer Tires
    When inflating trailer tires the recommendation is to inflate the tire to the max tire pressure listed on the sidewall when the tires are cold. So if your max pressure is 80 then that is what you would need to inflate to when cold. The increased pressure when hot is normal. Ideally in your situation where the temperature range is so extreme you would inflate the tires while cold in the temperature that they would be cruising in. If you don't inflate to max pressure the tires will not...
    view full answer...
  • Recommended Radial Tires for 12 Inch Wheels
    The Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E # AM10140 will fit on the same 12 inch wheel as the 4.80x12 tires you mentioned which use 12x4 inch wheels. This tire has a ply rating of 10 and a maximum load of 1520 lbs at 80 psi. This tire is rated for a maximum speed of 65 mph. These tires have a 2-year limited warranty. With your previous tires failing, you will want to make sure you stay within the load and speed rating of your tire. You also want to make...
    view full answer...
  • Can 4.80-12 Tire be Replaced with ST145/R12 Tire Using the Same Wheel
    Yes, the Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire # AM10140 referenced in your question will fit the same 12 inch wheel with a 4 inch width that your existing 4.80-12 size tires are mounted to. Just note that the ST145/R12 tire will be about 0.8 inches larger in diameter, so you will want to make sure you have the necessary clearance on your trailer for the slightly larger tire size. This Kenda radial ply tire is going to provide an excellent upgrade over your existing set....
    view full answer...
  • Replacement Tires for 12 Inch Rims on Trailer that is Used on Highways and Off-Road
    Even though you do ride over bumpy roads part of the time I would still stick with radial tires if they're available in the size you need. Bias tires are generally better for off-road conditions but the radials can handle some bumps in the road too. And the advantages of a radial tire on the highway will have a great impact over the bias on rough roads. I've linked our selection of tires that fit 12 inch rims. If you can tell me your exact tire size I can make a more specific recommendation.
    view full answer...
  • Availability of Trailer Tire in Size 145/80-12
    The specific tire part number you are looking for of AM10130 is not available right now but we do still offer the higher rated Load Range E part # AM10140 which is rated for 1,520 lb at 80 psi.
    view full answer...
  • Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire # AM10140 Speed Rating
    The Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire # AM10140 that you referenced has a 65 mph speed rating. While we don't have an exact replacement for your tire this will work great for you.
    view full answer...
  • Trailer Tire Recommendation for Replacing Size 145R12
    We have the tire size 145R12 by itself. For that you would want the part # AM10140. I attached a review video for this tire for you to check out as well.
    view full answer...
  • How to Determine Tire Age and at What Age Should a Trailer Tire Get Replaced
    The common recommendation is that trailer tires should be replaced at 6-7 years of age regardless of if the tread of the tire is still good. This means 6-7 years after the manufactured date and not just when the tire was purchased. Here's how to tell a tire's age. The DOT number code will be stamped on one side of the tire, near the bead area. This tire identification number will start with the letters DOT, then the next two numbers or letters are the plant code where the tire was manufactured....
    view full answer...
  • What is the Difference Between the Load Range D and E for the Tire Size ST145R12
    Load range D has a capacity of 1,220 lbs at 65 psi, whereas load range E has a capacity of 1,520 lbs at 80 psi. Basically the only difference between the two is the weight capacity. With trailer tires you always want to have them inflated to their maximum that way you get the best handling, braking and wear characteristics. You should note that if you increase the load capacity of your tires it will not necessarily increase the overall capacity of your setup. You must always go with the...
    view full answer...
  • Will a ST145/80R12 Trailer Tire Replace a 4.8-12 Trailer Tire
    Yes, 4.8-12 trailer tires and ST145/80R12 tires are both designed to fit a 12 inch diameter rim that is 4 inches wide. The only thing you will need to consider is vertical clearance. The Karrier S-Trail ST145/R12 Radial Trailer Tire # AM10140 that you referenced will be a little less than an inch taller. So if you have a fender above the tire you will need to consider this change in clearance. I attached an FAQ on trailer tires for you to check out also.
    view full answer...
  • What is Weight Capacity of Kenda Karrier S-Trail ST145/R12 # AM10140
    Our tires like the part # AM10140 are rated per tire. So this tire has a capacity of 1,520 lbs at 80 psi. If you used this tire on a single axle you'd then have a total tire capacity of 3,040 lbs. I also attached a review video for this you to check out as well.
    view full answer...
  • What is Max Pressure Rating of Kenda Karrier S-Trail ST145/R12
    For trailer tires the max pressure is actually the psi you need to inflate the tire to when cold to ensure you don't lose weight capacity and you don't cause premature failure due to heat build up. So the Kenda Karrier S-Trail ST145/R12 # AM10140 that you referenced has a 1,520 lbs at 80 psi which means when the tire is cold inflate it to 80 psi and as long as you are under the weight and speed capacity (65 mph) you do not need to worry about any tire pressure fluctuations.
    view full answer...
  • Can Special Trailer Tires Be Used on a Vehicle
    Special trailer tires like Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire # AM10140 can be used only on a trailer. If you are asking whether or not they can be used on a vehicle then the answer is no. Vehicles should only be equipped with passenger (P type) or light truck (LT type) tires but never trailer tires. Trailer tires are made differently than vehicle tires since their primary requirement is carrying the load of the trailer. Trailer tires have a stiffer sidewall to handle...
    view full answer...
  • Will ST145/R12 Tires Fit on Trailer That Currently Uses 4.80-12 Tires
    The Karrier S-Trail tire you mentioned, part # AM10140 would most likely fit on your trailer. They are about the same diameter as your existing tires, but are about an inch wider. You would want to check the distance between your existing tires and the side of the trailer frame or inside of the fenders to ensure you have proper clearance. This tire is designed for a 12 x 4 inch rim. Most 4.80-12 tires are rated for between 785-990 lbs, while the ST145/R12 tires you mentioned are rated...
    view full answer...
  • Available 12-Inch Trailer Tires in Load Range E Weight Rating
    The Load Range Rating of the trailer tires we have in size 4.80-12 is either Load Range B (785-lbs at 60-psi) or Load Range C (990-lbs at 90-psi). We have no higher-rated trailer tires in this particular size. In tire size ST145/80-12 we do have a Load Range E radial tire from Kenda, part # AM10140, which is rated for 1520-lbs at 80-psi pressure. This tire size will also fit on the 12 x 4-inch rim that takes a 4.80-12 tire. The tire size ST145/80-12 will be about 1-inch larger in overall...
    view full answer...
  • What PSI Should I Run My ST145/R12 Trailer Tire At?
    This is a question we get pretty frequently as there is definitely some opposing ideas and incorrect information out there in the world of the interwebs. That said, unless otherwise stated by the tire manufacturer*, you always want to run your tires at the max PSI listed on the sidewall of said tire. This is what the manufacturer did all the testing at and will be what all the ratings are listed for. The Kenda Karrier S-Trail ST145/R12 # AM10140, as an example, is rated up to 80 PSI. This...
    view full answer...
  • Largest Tires Needed to Fit 12 inch Wheels on Homemade Motorcycle Trailer
    The largest diameter tire we have that is compatible with a 12 inch wheel is a ST145/R12 size tire which measures 21.3 inches in diameter. For this I recommend using the Kenda Karrier S-Trail # AM10140 which has a load range of E (1,520 lbs at 80 psi) and a speed rating of 65 mph. This tire also comes with a 2-year warranty. I have attached a review video for you to check out.
    view full answer...
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  • Will Kenda ST145/R12 Fit on Same Rim as 4.80-12 Tire
    Both tire sizes you mentioned are designed to fit a 12 inch diameter wheel that is 4 inches wide so yes, the part # AM10140 that you referenced would work well for you.
    view full answer...
  • How to Determine Trailer Tire Age and When to Replace
    The date code of a tire is listed near the bead seat close to the wheel rim. You will find a DOT listing and the date of manufacture is the last four digits of the DOT code. The first two of these four digits are the week of manufacture, and the last two digits are the year. For example, if the last four digits of the DOT code are 2618, that means that the tire was manufactured during the twenty-sixth week of the year 2018. Trailer tires should be replaced about every 6 or 7 years, even...
    view full answer...
  • Recommended Replacement 145/R12 Tires for Pop-Up Camper
    The Kenda Karrier # AM10140 145/R12 tire you'd looked at would be the highest rated 12 inch tire we offer. The tire has a 1520 lb per tire/3040 lb/ axle capacity which would be perfect for your pop-up. The tire is compatible with 12 x 4 inch rims, so if that's what you currently have they'll work great for you. I've linked to a product description video featuring my buddy Cole who runs through the features of the tire.
    view full answer...
  • Speed Rating for Special Trailer Tires in Size ST145/80-12
    Excellent question. Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E # AM10140 has an 81-mph maximum speed so we do not indicate anything about speed on its product page. The linked page displays all wheel/tire items in this same 12-inch wheel and ST145/80-12 tire size. In this specific size we have no tires rated for higher speeds.
    view full answer...

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