tyre size                           ply               pattern                   pattern depth
9.00R20(TT)                   16                FY902                    15.5
10.00R20(TT)                 18               FY902                     16.6
11.00R20(TT)                  18              FY902                       17
12.00R20(TT)                   20             FY902                        17.5