The size for OTR as following: 17.5-25 .20.5-25.23.5-25.26.5-25.26.5-29.29.5-25.29.5-29........ The size for bais truck tyre as following : 1200-24.1200-20.1100-20.1000-20.900.20.......825-16.750-16.....600-16 .... The size for Radial truck tyre as following : 1200R20.1100R20.1000R20.900R20.11R22.5 315/80R22.5 12R22.5 11R24.5 12R24.5...