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SIZE TRA Code Ply Rating Standard Rim Tread Depth (mm) Overall Diameter (mm) Section Width (mm) Max. Load Capacity (kg) Cold Inflation Pressure (kPa) TT/TL 11.00-20 - 18 8.0 30 1105 293 3650 840 TT 12.00-20 - 20 8.5 30 1145 315 4000 880 TT