Conversion Table: Star Rating to Ply Rating
In case of radial OTR tires, normally star rating is used to indicate its load capacity, instead of ply-rating (PR for short), which is used on bias OTR tires.
Here is the coversion table from Star-rating to ply-rating.
Service Tire Size Star Rating Corresponding Ply Rating Grader 14.00R24 ★ up to 16 16.00R24 ★ up to 16 17.5R25 ★ up to 16 Earthmover 12.00R24 ★ ★ ★ up to 24 14.00R24 ★ ★ ★ up to 32 14.00R25 ★ ★ ★ up to 32 16.00R25 ★ ★ up to 36 18.00R25 ★ up to 24 18.00R25 ★ ★ up to 36 18.00R33 ★ ★ up to 40 21.00R33 ★ ★ up to 36 21.00R35 ★ ★ up to 44 24.00R35 ★ ★ up to 48 24.00R35 ★ ★ up to 48 27.00R49 ★ ★ up to 54 30.00R51 ★ ★ up to 58 33.00R51 ★ ★ up to 64 36.00R51 ★ ★ up to 66 40.00R57 ★ ★ up to 74 17.5R25 ★ up to 16 20.5R25 ★ up to 24 20.5R25 ★ ★ up to 28 25/65R25 ★ ★ up to 32 23.5R25 ★ up to 24 23.5R25 ★ ★ up to 32 26.5R25 ★ ★ up to 32 29.5R25 ★ ★ up to 34 29.5R29 ★ ★ up to 40 33.25R29 ★ ★ up to 44 37.5R33 ★ ★ up to 48 33.25R35 ★ ★ up to 44 37.25R35 ★ ★ up to 48 37.5R39 ★ ★ up to 52 40.5R/75R39 ★ ★ up to 54 Loader 15.5R25 ★ up to 16 17.5R25 ★ up to 16 20.5R25 ★ up to 24 20.5R25 ★ ★ up to 28 23.5R25 ★ up to 24 23.5R25 ★ ★ up to 32 26.5R25 ★ up to 24 26.5R25 ★ ★ up to 36 29.5R25 ★ up to 28 29.5R25 ★ ★ up to 34 29.5R29 ★ up to 34 35/655R33 ★ up to 36 45/65R45 ★ up to 50