DOT,CCC,ISO9001 certificate, tractor tyre R1 size for 20.8-38,18.4-38,15.5- ... .9-28,13.6-24,12.4-28,etc. Agricultural tyres R1 pattern technical parameters,The tractor tyre tire endows with a good ... drive power and hold powerThe reasonable pattern tilt angle guarantees a ... tyres 11.2-24 12.4-28 13.6-28 R1 pattern