The Continental HDR (Heavy Duty Regional) 255/70R22.5 is a premium 16-ply, Load Range H commercial drive tire designed for regional, on/off-highway, and all-season service. It features an open shoulder tread with interlocking blocks for superior traction and, typically, a SmartWay verified low-rolling-resistance compound. 
Key Features and Benefits
Application: Ideal for drive axles in regional and short/long-haul, on-off highway service.
Performance: Features offset tread blocks for all-weather grip and tapered grooves that reduce stone retention for better casing life.
Durability: 16-ply rating (Load Range H) ensures high load durability and stability.
Tread Depth: 26/32" or 18/32" (depending on specific sub-model/validation).
Speed Rating: Rated for up to 81-87 mph (140/137M or 140L).
Dimensions: Approximately 37.0 inches in diameter with a 10.0-inch section width.
Sustainability: SmartWay verified for fuel efficiency. 
This tire is commonly used for its ability to handle heavy loads while offering excellent traction in wet or snowy conditions