Load carrying capacity is one of the most important factors when selecting replacement tires. Passenger tires are built and rated under two main standards: - Euro‑metric: no letter before the size (example: 225/65R17). Built to ETRTO standards. - P‑metric: a “P” before the size (example: P225/65R17). Built to TRA standards. - LT‑metric: “LT” before the size (example: LT245/75R16). Built for light trucks and not interchangeable with passenger (Euro‑ or P‑metric) tires.
If you’re new to tire markings, start with our sidewall reading guide.
Both standards use a load index (two or three digits after the size) to express maximum load at a specified pressure. Because ETRTO and TRA use different test methods and reference pressures: - Euro‑metric tires of the same size often carry slightly more load than comparable P‑metric tires. - Some Euro‑metric and P‑metric sizes share the same load index, but real‑world load capacity at the vehicle’s recommended pressure can still vary by standard. - Extra Load (XL) or Reinforced (RF) markings indicate a higher load capacity at higher reference pressure versus Standard Load (SL).
Key rule: always choose replacement tires that meet or exceed your vehicle’s required load index and speed rating, and set inflation to the vehicle placard—not the tire sidewall. See our guides on load index and load range, avoiding overloading, and proper tire pressure.
If you’re unsure, we can confirm fitment and load requirements for your exact vehicle. Shop tires or make an appointment.
EVs are heavier, deliver instant torque, and benefit from low rolling resistance (RR). Look for: - Construction: XL load capacity, robust belt package, and strong shoulder blocks to handle weight and torque. - Efficiency: low‑RR compounds and aerodynamic sidewall designs to maximize range. - Comfort: noise‑reducing tread patterns and, in some designs, sound‑absorbing foam. - Traction: choose year‑round all‑season touring for mild climates; 3PMSF‑rated all‑weather or dedicated winter tires where winters are severe.
Flotation (inch‑sized) tires—like 33x12.50R17LT—are common in off‑road setups. Key metrics that define their performance: - Overall diameter and section width: determine ground clearance and footprint size. - Tread pattern and void ratio: impact soft‑surface traction and self‑cleaning. - Load range and max pressure: govern carrying capacity at trail and highway pressures. - Sidewall construction: plies, cap plies, and rim protection for durability when aired down. - Weight and rolling resistance: affect acceleration, braking, and fuel/energy use. - Air‑down performance: ability to increase footprint and “float” on sand, snow, or mud.
Compared to standard metric all‑terrain tires of OE sizes, flotation tires generally: - Improve soft‑surface traction and obstacle clearance. - Increase weight, rolling resistance, and braking distances on pavement. - Can raise hydroplaning risk and road noise, and may reduce wet/ice grip depending on compound. Choose flotation tires if off‑road flotation and clearance matter most; choose OE‑size all‑terrains for balanced daily drivability with light‑to‑moderate trail use.
“Best” depends on your vehicle, load requirement, climate, and driving style. Always match or exceed the placard load index and speed rating.
For EV or hybrid trims, favor XL load rating and low‑RR designs.
For heavier hybrid variants, consider XL versions to maintain stability and load capacity.