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When you’re towing long distances or hitting the highway in hot weather, this radial tire-and-wheel combo holds steady. The Tamarack ST205/75R15 radial tire handles up to 1,820 lbs at 50 psi and carries a speed rating M (81 mph). The 6-ply construction with double steel belts and double nylon plies keeps heat buildup low for longer tread life and smooth, confident tracking at speed.
No need for shop time before your next trip. This assembly comes pre-mounted, balanced using internal tire balancing beads, and filled with nitrogen so it maintains pressure longer than air-filled tires. That means fewer pressure checks and a smoother ride right out of the box. The combo weighs just 39 lbs, making it one of the lightest ST205/75R15 tire-and-wheel setups available.
Moisture, salt, and rough conditions don’t stand a chance against the white powder coat finish over an e-coat primer. This 15" x 5" steel wheel has beveled stud holes that help keep the wheel tight on the hub without constant re-torquing. It’s rated for 1,870 lbs and built to meet SAE J1204 standards for reliability mile after mile.
When the road turns slick, traction matters most. The Tamarack radial tread design uses open ribs and fine sipes that channel water away from the contact patch to keep grip consistent on wet, snowy, or icy surfaces. The reinforced sidewalls and nylon belt overlays help prevent tread separation while providing stable control through every turn.
Flat on the road? A 2-year complimentary roadside assistance program sends help anywhere in the United States, Canada, or Puerto Rico. The tire also carries a 5-year warranty plus a 1-year No Excuses Guarantee—if it’s damaged in that first year for any reason not covered by warranty, it’s replaced at no charge along with a flat labor rate for mounting.
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.
Today we're going to take a look at the Castlerock ST 205/75 R15 Radial trailer tire in a Load Range C on this 15 inch white modular steel wheel with the 5 on 4 1/2 inch bolt pattern.Now this tire and wheel assembly is ideal for RVs, campers and trailers. The wheel it's on is a sturdy steel wheel. Has the modular design, and when they say modular design that's the one that has the round holes all the way around the wheel.The wheels are white powder coat finish over an e-coat primer to help resist rust, and they do use the beveled stud holes to keep your wheel securely in place on the trailer hub. Eliminates the need for constant re- tightening of your lug nuts.Now the tire that's mounted on this wheel is a Castlerock radial tire. It is constructed with double steel belts, double nylon plys. Does use a nylon tread forming overlay to help prevent tread separation and they do use the tread wear indicators like you'll see on your passenger car tires where it gives you very easy ...
You can just look at the tread depth and see where the indicator is and it gives you an idea of how how your tire is wearing.This is a radial ply tire. It's great for highway use. Now if you'll notice on the valve stem they do have the green cap which indicated it is a nitrogen filled tire. This will help maintaining tire pressure longer than standard air, and it helps prolong the life of the tire and the wheel.On the tread itself they do use some siping which are the cuts in the tread. This will help channel water away from underneath the tire to improve traction during wet, snowy, or icy conditions.This is an ST tire, which means special trailer tire.
It has the sturdy sidewall so that it can handle heavy loads, and it is created specifically for trailers. Not intended for use on any other vehicles.This assembly does come with a complimentary roadside assistance for two years. They do offer the flat tire service available 24 hours, seven days a week, anywhere in the U.S., Canada, or Puerto Rico.The assembly does meet the DOT Department of Transportation specifications. The tire does meet the Federal Motor Vehicle Safety Standard Specs and the wheel meets the SAE J-1204 Standards.Now if you do want a center cap we do sell those separately on our website. Few specs on this again, the rim diameter, which is always measured inside the inside or bead-seat to bead-seat is 15 inches.
The width on just the wheel is five inches wide.This wheel has a bolt pattern of 5 on 4 1/2 inches and if you ever want to measure that bolt pattern on a wheel it's an odd number of lugs, in this case five.You just pick any one of the holes like this one, and you'll measure across to either one of these holes, but when you measure it from the center of the starting hole to the furthest edge of the hole that you measured to.On this tire it will measure 4 1/2 inches so 5-lug 4 1/2 inch bolt pattern. Does use a wheel lug size of a 1/2 inch X 20. The weight capacity on just the wheel by itself is 1,870 pounds and the pilot hole diameter, which the large hole here in the center of the wheel goes over the hub on your trailer. It's 3.19 inches.Now the tire size, which will be stamped on the sidewall. ST for special trailer, 205/75 R15 the R designates it as a radial designed tire.Section width on this tire is eight inches.
Overall diameter from the bottom to the very top when it's inflated is 27.1. This tire is a Load Range C which means it's a six ply rated tire. So it has a maximum load capacity of 1,820 pounds at 50 PSI.The last thing I do want to mention is most all the new trailer tires are coming through with speed ratings now, and it's usually labeled by a letter designation. So if you look right on the sidewall here it will say Speed Rating L, and L will mean 75 miles per hour speed rating.But that should do it for the review on the Castlerock ST 205/75 R15 radial trailer tire in a Load Range C on this 15 inch white modular steel wheel with the 5 on 4 1/2 inch bolt pattern.
Ratings & Reviews
Thanks for the fast shipping.
Easy ordering, great pricing, fast delivery! Etrailer is a wonderful place to shop!
ETrailer is a good company with good service. Although the first representative I was dealing with "disappeared" from our email contact, Brent J picked right up where we left off and found me what I needed. Thank you
Great trailer tire... best prices.
Fantastic customer service. I placed an order for the wrong product because I miss measured. Yet their customer service department immediately got me a return label and helped me get what I needed on the way. Really nice to have such helpful service when it's hard to find these days. Thank you.
The tire and wheel were the ones we ordered and they arrived when they were suppose to.
Service Manager at a RV Dealership
Ordering and delivery are always a breeze! Customer service is wonderful with etrailer.
Wheel and Tire came as advertised, servicer was very efficient and simple, delivery was easily trackable. Would definitely use this company again.
Order response was excellent as before, Will continue to order from E trailer if at all possible Ordered just a tire and rim and the match was perfect! Great job!
product was as advertised. Shipping was a little slow but was taken care of when I called. All said and done i will order from etrailer again.
They arrived quickly, and we just completed a 4,000+ mile road trip with no issues! Maintained the tire pressure throughout. Great tires for the price!
ST205/75R15 Radial Trailer Tires were exactly what we needed and look great.
These are quality wheels and tires. Shipping was fast and they were shipped in heavy duty boxes so no dings or scratches.
I’m very pleased with my recent purchase from etrailer. The tire was shipped quickly and received promptly, and the free shipping makes it a deal that’s hard to beat! Thanks for the great service! I’ll be back again...
Tires had VERY deep treading, no blemishes, were N2 filled and at proper pressure. Rims were also without blemish and had hard a shiny baked enamel coating. They were well packed, receipted, and delivered quickly as promised. I have no negative comments to make. They are completely to my satisfaction.
Exact match to the tires and rims on my trailer. Fast delivery. It was less expensive than the tires and rims locally!.
You were a great company to deal with. Everything was done accurately and quickly. Had two wheels and tires delivered three days after ordering. Communication was great also.
An expensive yet quality option as a spare or replacement. I realized that radial tires are preferred and that bias-ply are generally not suitable for speeds above 50 MPH. I'd buy one of these again.
Ordered 4 new tires on rims for my trailer. I couldn't believe how fast I received them. Especially everything going on in the world right now. Packages, rims, even tire pressure we're all perfect no adjustments needed.
Thanks etrailer I will definitely be ordering again.
Might just go ahead and order me a spare tire now.
I bought a spare tire and wheel from etrailer and the whole experience was great. It was easy to find my tire and wheel. The price was good and it was shipped immediately. I had my new tire in about 4 days and it was exactly what I wanted. It couldn’t have been a better.
Great service. Delivered o time. Would have got 5 stars, but the tire pressure fluctuated from delivery to use but only in 2 of the 4 tires.
Pretty much an exact match for the tires on my dual axle trailer. When I purchased the used trailer it didn't come with a spare. I'm so glad I bought this. Just yesterday, while travelling from through Massachusets, some unavoidable road debris caused a flat. I'd have been in a tight spot far from home without a spare. My truck jack worked fine in a pinch, but I'll carry a small floor jack in the trailer in the future. It wasn't any fun lying on the break down lane positioning the bottle jack. Be prepared and be safe. This spare tire and wheel arrived as expected, hassle free.
The tire is exactly what is on the trailer but we purchased it as the spare tire. White rim was not desirable but given the cost of the aluminum rim and being the spare tire my husband felt he could live with a white rim!! :)
Connie
9/2/2020
Its been a year and I would say it is workiing out just fine. We use it as a spare and fortunately we have not had a flat tire to put this tire on. So it is in the trailer collecting dust.....
Tires/wheels arrived as advertised, aired up and ready to roll.
James
5/17/2021
Excellent
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Earl
4/6/2022
Same problem with fluctuating air pressure. Even wear. Average durability. Still would recommend.