Established in 1976, Triangle Tires is a China-based tire manufacturer that ranks #14 in the world's top tire manufacturers. It manufactures tires for passenger cars, OTRs, trailers, and commercial vehicles.

The Triangle STR TR643 is a trailer tire optimized for improved performance at high speeds and increased load carrying capacity. It sports a 5-rib tread pattern, innovative features, and an optimized rubber compound to offer smooth, comfy rides and long-lasting service. Suppose you want to buy a trailer tire. In that case, this Triangle STR TR643 review will give you a detailed analysis of the tire along with important insights like pros and cons, features and benefits, and SimpleTire’s verdict based on its proprietary tire rating system, SimpleScore.

Features and Benefits

The Triangle STR TR643 falls in the category of special purpose trailer tires, which are made for vehicle axles. They are mounted on trailer axles and are optimized to last longer and haul things. These are most commonly fitted on small to medium- or large-sized RV trailers and are typically seen mounted on wheels of boats, campers, and utility trailers. Now, let’s take a look at the features and benefits of Triangle STR TR643:

• Improved highway stability – The STR TR643 features a symmetric tread design with a solid center rib that ensures dependable highway stability.
• Solid year-round traction – The tire is built using an all-season rubber and an optimized tread pattern, and both of these things contribute to a solid year-round traction performance. The twin steel belt construction of the tire also contributes to an enhanced traction performance. For better traction in wet conditions, there are grooves on the tread that channel water from the contact patch area and don’t let the trailer sway away.
• Long-lasting tread wear – It is essential for any trailer tire to serve longer and therefore, Triangle has featured the tire with its unique symmetric tread pattern that prevents uneven and premature wear. Similarly, the rubber compound of the tire also ensures longer and slower wear.
• Enhanced durability – Even the durability standards of this tire are good and the credit goes to the twin steel belt construction that also sports reinforced nylon cap plies (in select sizes). The tire is overall built and engineered to carry heavy weights and its max load capacity ranges between 1356/1202 to 3527/3086 lbs.
• Controlled trailer ride – It is necessary that the trailers ride in complete control and in conjunction with the towing vehicle, therefore, the STR TR643 is offered with a rounded profile that ensures improved trailer ride and control.

The Triangle STR TR643 is available in 13- to 16-inch rim sizes and some of its available sizes include:

• ST175/80R13
• ST205/75R14
• ST225/75R15
• ST235/80R16

Pros and Cons

Having covered the features and corresponding benefits of the Triangle STR TR643, let’s now check out the pros and cons to learn the strengths and weaknesses of the tire.

PROS:

• More durable and stronger than its peers.
• Optimized for dependable year-round traction and grip.
• Long-lasting tread life, which is better than some of its competitors.
• Engineered for better stability and ride control.
• More affordable than various other budget trailer tires.

CONS:

• It is not built or designed for use on passenger vehicle axles.
• Not backed by a limited manufacturer tread life warranty.
• Not made for use on roads covered with thick ice or snow in extreme winter weather, when the temperature is below 45 degrees Fahrenheit.

SimpleTire’s view on Triangle STR TR643 tires

In the rim size range of 13- to 16-inch, if you are looking for an affordable trailer tire for a boat, camper, or utility trailer, then Triangle STR TR643 could be a good choice. The tire is more durable and stronger than many of its peers and scores a higher 8.8 SimpleScore rating in durability. It also doesn’t disappoint on the traction part, securing an impressive 8.1 SimpleScore, and allows you to drive confidently in dry, wet, and light snow conditions. With a set of STR TR643 tires installed, you don’t have to worry about installing the tires anytime soon as this one scores a higher 8.1 SimpleScore rating in longevity.

Overall, with a good 8.0 SimpleScore on a scale of 10, you will find the tire worthy enough to let your trailers do the job they are supposed to. Additionally, the tire also offers better stability and ride control and avoids the chances of the trailer swaying away or derailing while taking turns.

That being said, you will have to accept the fact that the tire isn’t designed for use in extreme winter conditions as it is not Three Peak Mountain Snowflake certified. It also doesn’t come with any tread life warranty and shouldn’t be considered for use on passenger vehicle axles.

Some of the competitors of the Triangle STR TR643 include:

• Trailer King RST II
• Carlstar Radial Trail HD
• Atturo ST300
• Travelstar HF288
• Kenda Karrier
• Prinx ST01
• Goodride ST100

Vehicles the Triangle STR TR643 is a good replacement tire for

The Triangle STR TR643 is a good replacement choice for boats, campers, and utility trailers with 13- or 16-inch rims.