The Yokohama 109L 445/50R22.5 is a BluEarth fuel-efficient, long-haul trailer tire for commercial use, featuring an ultra-wide base (UWB) for stability, an advanced tread compound for low rolling resistance and long life, and a design for all-weather traction, ideal for drop deck, closed axle, and spread axle trailers, boasting SmartWay verification for efficiency. 
Key Features & Benefits:
Fuel Efficiency: An advanced tread compound and optimized tread pattern with seven grooves reduce rolling resistance, lowering fuel consumption and earning it SmartWay verification.
Long Tread Life: A durable Zero-Degree Belt ensures a stable footprint for even wear, while an advanced Stress Control Groove resists damage from curbing and tight turns.
All-Weather Traction: Optimized sipes and an all-season compound provide grip and braking power in wet, dry, and even some winter conditions, with grooves that evacuate water and slush.
Durable Construction: The robust casing is built tough for demanding trailer applications, offering resilience in high-scrub conditions.
Application: Designed for trailer axles on long-haul, pickup, and delivery trucks, including drop deck, closed axle, and spread axle trailers. 
Understanding the Numbers (445/50R22.5):
445: The tire's width in millimeters (about 17.5 inches).
50: The aspect ratio, meaning the tire's height is 50% of its width.
R22.5: The rim diameter in inches. 
Load/Speed Rating (109L):
109: The load index, indicating maximum load capacity.
L: The speed rating, signifying a maximum speed of 75 mph (120 km/h).