A 27×8.50-15 tire measures about 27 inches tall, 8.50 inches wide, and mounts on a 15-inch rim.
One glance at a tire sidewall full of numbers and letters can stop anyone cold, especially when the code looks nothing like a passenger-car size. The 27×8.50-15 format is an inch-based flotation code used mostly on skid steers, loaders, backhoes, and small tractors, and each number maps to a real physical measurement.
Reading it takes about ten seconds once you know the pattern. The harder part is understanding why two tires with the identical size code can carry wildly different loads and pressures.
What Do The Three Numbers Actually Mean?
The code splits into three parts: overall diameter, section width, and rim diameter, all in inches. In 27×8.50-15, the 27 is nominal overall tire diameter, 8.50 is nominal section width, and 15 is the wheel diameter the tire fits.
Unlike metric passenger tires, there is no aspect ratio, speed symbol, or construction code baked into the base format. The “x” separators signal a flotation-style size, which is why the numbers run large and wide relative to the rim.
Two details trip people up. First, “nominal” means the real measured diameter often lands slightly off 27 inches. Second, the width figure describes the tire’s cross-section, not the tread face or the rim width it needs.
What Does NHS Mean And Why Does It Matter?
NHS stands for Non-Highway Service, and it tells you the tire is built for off-road or industrial duty rather than road travel. You will see it written as 27X8.50-15NHS, and it appears on skid steer, loader, and lift equipment tires.
That marking is not cosmetic. A tire carrying NHS is designed around low-speed, high-torque, rough-surface work, and using it on a public road can be both unsafe and illegal depending on your state.
You may also run into 27×8.50-15/10 in product listings, where the trailing number typically indicates ply rating or a load-related spec. Check the actual sidewall, not the listing title, for the definitive rating.
The Same Size Code Hides Very Different Specs
Two tires stamped 27×8.50-15 can differ in load capacity, pressure, and tread by a wide margin, so the size code alone tells you almost nothing about performance.
Manufacturer data proves the point. Same size, different jobs.
Retailer data varies too. Those gaps matter when clearance is tight.
Spec Comparison Across Real 27×8.50-15 Listings
| Brand / Model | Key Rated Specs | Intended Use |
|---|---|---|
| Goodyear Farm R4T | 102A8, 8 PR, 848 kg max load, 692 mm diameter | Agricultural / industrial |
| Titan Trac Loader II | 112A2, 6 PR, 45 psi, 2,470 lb load, 15/32″ tread | Loader / skid steer |
| Galaxy Marathoner R-4 | 45 psi max, 37 lb, 26.9″ diameter, 8.4″ width | Industrial tractor |
| Goodyear farm-tire retailer listing | 44 psi, 1,870 lb single / 1,645 lb dual, RCI Group 27 | Farm implement |
How Do You Verify Fit Before Buying?
Match the rim diameter exactly, confirm rim width compatibility, then check that load rating and pressure meet what your machine’s manual specifies. Skip any of those three and you risk unsafe mounting or premature wear.
A 27×8.50-15 tire fits a 15-inch wheel only.
Tread type is the last gate. R-4 industrial, skid steer, and farm variants all sell under the same 27×8.50-15 code, and they are not interchangeable in performance. Confirm the tread pattern matches your actual application before ordering.
When you are ready to compare specific models, our tested 27×8 50 15 tractor tire roundup breaks down real options side by side. If you want the official baseline spec before you buy, Titan’s Trac Loader II specification data lists full load, pressure, and dimension figures for this size.
Common Mistakes To Avoid
Most sizing errors come from treating the code as a complete spec sheet when it is really just a starting point.
- Assuming all 27×8.50-15 tires share one load rating, tread, or pressure. Listings show materially different specs across brands and models.
- Ignoring the NHS marking, which flags a tire as non-highway and points to off-road service only.
- Confusing flotation sizing with metric sizing. This is an inch-based flotation format, not a passenger-car metric code.
- Mounting on an incompatible rim width, since some products specify 7 in, 7JA, or a narrow range.
- Skipping the owner’s manual, which is the only reliable source for your machine’s required pressure and load values.
Use only the vehicle manufacturer’s recommended tire size, load, and inflation values. Retailer listings say the same thing plainly: consult the owner’s manual. Do not infer dimensions from the size code alone, because actual diameter, width, and capacity vary by brand and construction.
FAQs
Can I put this tire on a 16-inch rim?
No. The final number in the code, 15, sets the rim diameter at 15 inches, and that match must be exact. A 16-inch wheel will not seat this tire, and forcing an undersized or oversized tire onto the wrong rim is a safety risk. Always confirm the wheel diameter stamped on your rim before buying.
Why does the same size show different load ratings?
Because ply rating, construction, and intended service differ between models. The size code only fixes the envelope. Load capacity comes from how the tire is built, so always read the sidewall.
Is a 27×8.50-15 tire legal on the road?
Usually not. The NHS marking means Non-Highway Service, and these tires are built for low-speed industrial and agricultural work. Road use can be unsafe and may violate state law depending on your jurisdiction. Check your local regulations before operating on any public roadway.
References & Sources
- Titan International. “Trac Loader II Specifications.” Official load, pressure, and dimension data for 27×8.50-15NHS.
- Goodyear Farm Tires. “Farm R4T Product Listing.” Manufacturer specs for the 27X8.50-15NHS, including ply rating and load index.
- TireSize.com. “How to Read Tire Size.” Explains the difference between flotation and metric tire sizing formats.