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Hauling long distances or running in hot weather is no problem for this setup. The Kenda Karrier S-Trail ST145/R12 radial tire is Load Range D with an 8-ply rating and a 1,220-lb capacity at 65 psi. It’s matched to a 12" x 4" steel wheel rated at 1,250 lbs. The M-speed rating (81 mph) and DOT compliance give reliable highway performance for extended trips without worrying about heat build-up or tread wear.
This tire is built for endurance. Double steel belts and full nylon plies combine to create a strong carcass that stands up to repeated towing and heavy loads. The premium rubber compound disperses heat while maintaining shape, so you get longer tread life and consistent grip even when you’re running loaded for hours on the road.
The tread design borrows from automotive tires for better control. Computer-generated ribs with breaks let water move off to the sides, while thin sipes cut into the rubber channel water away from contact surfaces. That means improved traction when the road is wet, snowy, or icy—exactly when you need it most.
A solid connection matters when towing. Beveled stud holes help keep the wheel snug against the hub so lug nuts don’t loosen over time. The white powder coat over an e-coat primer protects the steel against rust and corrosion from road spray or humidity, keeping the wheel looking clean season after season.
No extra steps before hitting the road—this combo comes mounted and inflated to spec. With a standard 5 on 4-1/2" bolt pattern, 3.19" pilot diameter, 0 offset, and 1/2"-20 wheel bolts, it installs easily and fits right where you need it. It’s a simple, complete setup that’s balanced, durable, and ready to roll.
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
Fast service, fast delivery. I went from the standard 8.10 trailer tire to the slightly larger radial on the front last summer. I just replaced the back two with the same radials yesterday. So far I’m very happy with them all
Thanks for the great service! The evidently hard to find ST145R12 D tires are on my pop Up. Rims were superior to what I was replacing and what I expected. I'm looking forward to trying out the tires very soon.
Purchased these tires to replace the 20 year old originals for a 1500 mile trip. Loaded trailer with approximate 1600 lbs materials. Had zero issues during transport. So far, so good.
Very good customer service. We ordered the wrong tires for our Camper online. I called but the orginal order had already shipped. They were able to get the right tires out and we received both orders the very next day. Took the wrong tires to UPS and shipped them back to them. We were going camping on Friday so having the quick turn around was fantastic. We ordered them on Wednday, received them on Thursday, put them on the camper so we were ready to go on Friday. Great job! We were frantic trieing to find the right tires for out camper and they came through with flying colors. I have told everyone I know that has a trailer or camper about the extra ordinary service.
Arrived as scheduled. Upgraded retrofitted jetski (kayak) trailers bias tires to these radials. Bearings and tires were the first items to check off tight lines all.
These tires fit great on a 2001 Coleman Taos pop up camper, replacing the stock 5.3x12 bias plys. They had a slightly larger diameter than the old bias plys (even though etrailer's tire size guide says the bias plys would be bigger), maybe 1" bigger. That's only 1/2" all the way around, not a big difference, and no clearance issues. I bought 3, one was a little low on air (50psi) so you might want to check that when they're delivered. Shipping was fast, I received them in 2 days. I'll update this review if I have any problems with them over time, but looks great so far.
I haven't had an opportunity to put them on my trailer yet.
Perfect. I bought as a spare, it matches the others perfectly.
I needed to replace my old trailer tires. I wanted tires and rims. I am very pleased I found this item. This has a slightly higher profile than my former tires that were also 12". I had the room in my wheel well. Not problems installing.
Perfect upgrade to my stock carry on tires. I needed tire rated for interstate travel and these fit the bill. Thanks etrailer
I needed tires for my 600LB popup camper. I wanted steel belts in tire because I've had better luck with them holding up better over the years. These tire look and fit good. So time will tell how they hold up.
Everything I needed with very fast and free shipping. I will definitely shop with etrailer again.
Great looking tire. Much better than the bais ply tires that were on the trailer to start
Since I live in a medium size city I use the internet a lot to order goods. Recently I concluded I needed new tires for my 1995 boat trailer I use for my Aluma Craft boat. However popular tire sizes have changed substantially since 1995. I had problems finding the right size for my trailer. Plus I wanted to order rims with the tires so I could install them myself. Fortunately I found etrailer.com which had the right size available at a very reasonable price. I ordered and had my rims and tires within a few days. They are in excellent condition and have been installed. What a pleasant ordering experience. I give etrailer.com an A+ for service, availability, and price!
The tires arrived a few days ago and look fine. Very impressed with the short order to delivery time. 4 star rating because they haven't even been mounted on the trailer. Hope I can give them a 5 star rating a year from now.
I haven’t done much pulling with the tires yet but they arrived lightning fast in solid packaging and in great condition. I have them balanced and ready to go and know they’ll be a great improvement over OEM tires.
Wheel & Tire assemblies arrived faster than I expected. Products were as advertised, look to be of good quality and fit well. And, as with my past purchases from etrailer, another easy, no hassle experience.
Huge upgrade from the bias-ply equivalents of these tires. The weight and feeling is night and day. Nice peace of mind to have radials for the first time on my old boat trailer.
Joshua
1/14/2026
Took it across the country 2K miles each way and tires seem to be holding up at 75 mph highway speeds with surprisingly modest wear... HUGE difference from the old bias plys which wore unevenly and fast cuz not rated for over like 55mph and they heat up get soft and start wearing away fast ... love having radials for boat tires for highway hauling as they ARE rated for over 55mph and hold up MUCH better... worth the extra $$ in terms of lifespan and peace of mind.
The two tires on rims came ready to use. It was a great convenience receiving them fully inflated.
Unbelievable service. Have no idea how etrailer was able to get these two tires to me in about 18 hours. They were the exact tires I was looking for competitively priced and I didn't have to hunt around town looking for them. etrailer will absolutely be the first place I look when searching for other trailer products.
Nice wheels and tires. Easy order and quick shipment.
wow easy ordering, fast delivery, free shipping, good communication with customer. will definitely order again no problem.
Tires are much more substantial than the original tires. Appear sturdier and better able to handle highway travel.
Steven
6/5/2026
Excellent, big difference in the ride.
4 stars because I haven't had them long. Excellent shipping time, great product out of the box. Wheels were quick to install and my PWC trailer was ready to go to the lake!
Looks great, packaged great, with etrailer having a great selection on their website, at competitive prices, with really fast shipping.
Do you have a question about this Trailer Tires and Wheel?
Condition: Installed
Notes: Item has been previously test fitted and has cosmetic install marks
Condition: Installed
Notes: Item has been previously test fitted and has cosmetic install marks
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Nick
1/23/2024
Not a year yet, but vacation Jan 2024, took me over 2000 milestotal on these tires , Northern Indiana to Sebring Florida and back. No problems with tires.