Cooper Discoverer AT3 4S All-Terrain Tire

TL;DR All-weather all-terrain with UTQG Traction A and 3PMSF; 1st in wet braking in the 2022 Tire Rack AT test. Quiet for the class; owner tread life centers on 40-60k miles. ## What it is and how it performs P-metric all-terrain across 15- to 20-inch rims; UTQG Treadwear 620 / Traction A / Temperature B; 3PMSF certified. Tire Rack's 2022 AT test placed it 1st in wet braking (10+ feet ahead of the field) and 1st in road ride comfort. Two Tire Rack test cycles confirm solid winter traction. Owner-odometer data centers on 40-60k miles; a minority reports 30-40k under aggressive year-round use. ## Who should buy this, and who should skip it Right pick for an SUV or light-truck owner who wants 3PMSF winter capability and a quiet highway ride. Skip if maximum off-road traction leads the priority list; a more aggressive all-terrain or rugged-terrain class fits that better. ## Safety and environmental impact Cured-rubber-and-steel construction; no chemical-exposure pathway from the tire itself in normal mounting and use. No Prop 65 warning in the cache. Tires as a class shed tire-wear particles and 6PPD-quinone in road runoff and are mostly burned at end-of-life, driving the below-average environment score.