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When you’re towing long distances or carrying serious weight, this tire is ready to hold steady. The Kenda Karrier S-Trail ST145/R12 radial trailer tire has a 10-ply rating and can handle up to 1,520 lbs at its maximum pressure of 80 psi. It’s speed-rated M for 81 mph and built with sturdy sidewalls to manage heavy trailer loads on the highway without flexing or overheating.
This radial tire is designed for highway towing where heat buildup and wear can ruin ordinary tires. The cords sit at a 90-degree angle to the direction of travel to cut rolling resistance and improve steering control at speed. Inside, double steel belts and full nylon plies add strength and endurance, while the premium rubber compound helps disperse heat so the tread runs cooler and lasts longer mile after mile.
Rain or slush on the road won’t slow this tire down. Its automotive-grade tread uses broken ribs and siped grooves that channel water away from the contact patch for solid grip on wet, snowy, or icy pavement. That smart design means dependable traction when conditions change mid-trip.
Kenda backs the Karrier S-Trail with a 5-year limited warranty plus a 1-year worry-free guarantee that replaces the tire at no charge if it’s damaged within the first year. It’s reassurance that this ST145/R12 radial isn’t just built tough—it’s covered to keep you rolling without second thoughts.
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"
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
Ratings & Reviews
Clear information provided prior to ordering my tires. It was exactly what I needed and arrived in like 2 days.
Great tires - happy with the purchase and the purchase experience.
Thank you.
The tires were exactly as advertised.
Exactly what I ordered, delivered right on time.
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.
100% upgrade from bias tires on my boat trailer. Much better quality tires! Etrailer has excellent customer service and products shipped quickly.
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)
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.
I finally wore a set out before having a tire fail, the extra high load rating E made it possible! This made the additional initial cost fare overcome the cost of replacement on the side of the highway and the damage caused by a blowout or tire delamination!
This is my second set of Kenda Karrier tires. These tires are on my popup camper. I had the first set on the camper for 5 years and never had a blow out. In that 5 year span, we towed the camper from Louisiana to Colorado, Arkansas, Oklahoma, Texas, Mississippi, and Florida, all on that one set of Kenda tires. Around 40 camping trips and we never had a problem with the tires.
great tire, upgraded from bias ply. These are far better. Ride much better, quieter, very pleased!
We just returned from a 1 1/2 month road trip using these tires on a car dolly, and they were truly put through a test. Several interstates were in pretty tough shape with cracks and pot holes that we were unable to avoid. After checking the tires, they were found to be in better than expected condition. I think they're ready to handle another 6,000 miles.
Great tires for a small trailer. They last longer than what came on the trailer and have a better speed rating. I did not try mounting them myself.
Kendall load range E is the only tire I will use on my dual axle boat trailer.
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.
David K.
5/3/2024
Great wheel and tire set. I put a lot of miles on these last season and they are holding up very well.
These tires are so much better than the cheap 2 ply tires that come on my new Sea Doo trailer.
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.
James
9/7/2019
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.
Very impressed with E trailers ability to stock ship and have delivered items in a very timely fashion. Great communication thank you SARA, very complete and detailed tracking. All at market leading prices.About the tires, time will tell. Name brand so they should live up to their reputation.
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.
5/29/2018
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.
Not really a review of the tires ( just got them, haven't used them yet) but as far as etrailer, it's been a great experience. Good communication, fast free shipping.
These tires replace those generic tires on a boat trailer.
Tires are date matched, this year. They appear to be a good tire, time will tell.
As always customer service was/is fantastic! Thanks Kelly P!
Lazer S.
8/19/2026
Glad to hear you are happy with them, James! Kenda makes some very good tires, so I'm sure you will be happy with them! Is that a pontoon boat you have on your trailer?
Best trailer tire I have had to date. I use this on an aluminum trailer that carries a single SeaDoo GTX 155. I like to travel between various locations in Florida that are both salt and freshwater, so these tires have seen interstate speeds, heat, rain, etc. They still have so much tread that I have not bothered to measure it. The minor tread wear seems to be even. What more could you ask for.
Great tires for my Lil Loafer vintage trailer.
Very prompt delivery considering being shipped to Canada.
Expensive given the exchange rate and shipping cost to Canada, but I can't find these tires locally.
Tires were a January 2026 manufacture date, I consider this acceptable being delivered in June.
etrailer is great!
Kate F.
7/13/2026
Thanks for the great review Doug. I wish there was something I could do about that Canada standard shipping rate, ouch! Just glad we could deliver what you needed =)
I have never had a bad experience with any purchases, to think about it, I never had a Mediocre experience. All products purchases have been as described on the website. I recent order was tires for my Kayak trailer with an upgrade from 4.80/12 Load Range B tires to ST145/R12 Load Range E. Nice to have a large selection of products to choose from with unbeatable prices.
Thanks to the Crew at etrailer!
I really can’t give an honest opinion about what I think except for that the service was exceptional. The ease of ordering and shipping was great. I already had a pair of Kendra Carrie S Trail, trailer tires on my brand new trailer that I purchased with my Sea-Doo JetSki, but I didn’t like that the trailer came with steel rims that will eventually rust, which has nothing to do with each trailer, but wherever I picked up the trailer from. I however liked the way the tires were in the reviews when I was doing some research that when I purchased a new set of aluminum rims that matched my personal vehicle, I ordered another set of these tires to be mounted on the rims.
Lazer S.
5/13/2026
Glad we could help, Steven! What are you using to tow your Sea-Doo and trailer?
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Gwendolyn Y.
10/2/2025
Wow, I think if anyone has put these tires to the test it's you, Mark. Where's the next destination?