Ironman STR ST235/80R16 Tire

Ironman STR ST235/80R16

4.8(257 store reviews)
$166.38 each
$665.52 set
or 4 interest-free payments of $166.38 Shop Pay Klarna Afterpay interest-free when paid on time
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Fitment Guarantee Risk free
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Authorized Dealer 100% brand new wheels
Category
Trailer
Load index
126/1223,748 lbs per tire
Speed rating
NUp to 87 mph
Know your tire

About the Ironman STR

Built for the Load, Ready for the Road.

Best forThe Ironman STR is ideal for trailers — including utility, cargo, and recreational trailers — that require reliable load support, stable tracking, and consistent performance during towing.

The Ironman STR is a purpose-built trailer tire designed to handle the unique demands of towing. Engineered specifically for trailer applications, it prioritizes straight-line tracking, load-bearing durability, and resistance to heat — the core challenges that trailer tires face on long hauls or frequent towing duty.

The STR uses a trailer-specific rubber compound formulated to reduce rolling resistance, which can help improve fuel efficiency during towing. Continuous center ribs keep the tire tracking straight, while heavy-duty steel belt construction manages heat and supports substantial payloads. Deep circumferential grooves evacuate water to reduce hydroplaning risk, and reinforced shoulder blocks resist uneven wear through corners.

The numbers

Specifications

Size & Dimensions
Brand Ironman
Tire Model STR
Part Number HERC-98937
Tire Size ST235/80R16
Section Width 235
Aspect Ratio 80
Rim Diameter 16
Overall Diameter 30.79
Overall Width 9.25
Sidewall Black Side Wall
Performance
Speed Rating N
Load Index 126/122
Load Range F
Ply Rating 12
Max Inflation Pressure 95
Tread Depth 8
Ratings
Mileage Warranty Manufacturer's Warranty
Category
Tire Type Trailer
Good to know

Questions about this tire

What does ST235/80R16 126/122N mean?

235 is the tread width in millimeters, 80 means the sidewall is 80% of that width, and R16 is the 16-inch rim it mounts on. 126 is the load index (3,748 lbs per tire), and N is the speed rating (up to 87 mph).

What makes the Ironman STR different from a standard passenger or light truck tire?

The STR is engineered specifically for trailer use, which means it prioritizes load capacity, heat resistance, and straight-line stability rather than steering response or ride comfort. Passenger and light truck tires are not designed to handle the side forces and sustained loads that trailers generate, making a dedicated trailer tire like the STR the safer and more durable choice for towing applications.

Will the STR help with fuel economy while towing?

The STR uses a trailer-specific compound formulated to lower rolling resistance, which can contribute to modest fuel efficiency gains during towing compared to less optimized trailer tires. That said, overall fuel economy while towing depends heavily on load weight, vehicle, speed, and aerodynamics.

Is the Ironman STR suitable for use in wet or rainy conditions?

Yes, the STR features deep circumferential grooves designed to evacuate water from the contact patch and reduce the risk of hydroplaning. While this provides meaningful wet-weather capability, trailer tires should always be matched to appropriate towing speeds and load limits for safe operation in adverse conditions.

Does the Ironman STR carry a mileage warranty?

The STR is covered under the manufacturer's standard warranty rather than a specific mileage guarantee. For warranty details and coverage terms, we recommend contacting us directly or reviewing Ironman's current warranty documentation.

What rim sizes does the Ironman STR come in?

TFS Wheels currently stocks the Ironman STR in four sizes spanning 15-inch and 16-inch rim diameters, covering a range of common trailer fitments. Use the size selector on this page to confirm availability for your specific trailer.

The brand

About Ironman Tires

Ironman is a value-oriented tire brand distributed by Hercules Tire, a subsidiary of American Tire Distributors. The brand is positioned to serve budget-conscious consumers across the North American market.

Shop all Ironman tires →

Vehicle Compatibility

Buying from TFS Wheels

Shipping, returns & guarantees

Authorized Dealer — 100% Brand New Wheels & Tires

TFS Wheels is an authorized dealer for every brand we carry. Every wheel and tire we ship is brand new, unused, and packaged in its original manufacturer's box. We never sell refurbished, demo, or return-stock product. All manufacturer warranties apply and our warehouse is staffed by people who only handle wheels and tires — no in-transit damage, no test-fits, no surprises.

Free Shipping (Lower 48)

Free shipping on every order — wheels, tires, and accessories — to the contiguous United States. No minimum order, no hidden fees.

Standard delivery is 4–7 business days; expedited is 1–4 business days. Orders placed before 1:00 PM ET typically ship the same day. We do not ship internationally or to PO boxes.

Fitment Guarantee

If a wheel or tire marked "Direct Fit" or "Aftermarket Fit" for your vehicle arrives and does not fit as expected, we cover both the restocking fee and return shipping. The same applies if the bolt pattern does not match — provided your vehicle information was submitted at checkout.

To qualify for the guarantee, enter your year, make, model, and submodel before placing the order.

Manufacturer's Warranty

Every wheel and tire is covered by the full manufacturer's warranty against defects in materials and workmanship. Coverage terms vary by brand — most cover structural integrity for the life of the wheel and finish for 1 to 2 years from purchase. If you ever have a warranty question, contact us first; we work directly with the manufacturer on your behalf so you don't have to.

Accessories Included with Your Order

When you submit your vehicle information at checkout, the right lug nuts and (if needed) hub-centric rings are automatically added to your cart in the correct sizes — no guessing, no separate ordering.

TPMS sensors are also available in the cart. We program each sensor to your vehicle's exact year, make, model, and submodel before shipping, so they arrive ready to sync with your truck or car the moment they're installed. This typically saves customers the dealer or installer's programming fees, which often run several dozen dollars per wheel.

Returns

Returns are accepted within 30 days of purchase on items in new, unused condition. A 25% restocking fee applies to general (change-of-mind) returns, and the buyer covers return shipping.

The restocking fee and return shipping are waived for incorrect items, transit damage, or fitment issues when vehicle information was provided at checkout. Single wheels, single tires, mounted items, special orders, and accessories (lug nuts, locks, hub-centric rings, TPMS sensors, installation kits) are final sale.

Verified buyers

Owner Reviews

What Happens After You Order

A specialist checks your fitment by hand before anything ships.