The John Deere 9120 tractor tire size is front 20.8R42 and the rear is 20.8R42.
Front tire20.8R42
Rear tire20.8R42
Front/rear setupSame front and rear tire size
Rim diameter42 in front/rear
John Deere 9120 Tire Size Details
Front tire size
20.8R42
Rear tire size
20.8R42
Front/rear setup
Same front and rear tire size
Tire construction
Imperial radial
Section width
20.8 in
Rim diameter
42 in
Tire Size Comparison Chart
Front rim diameter comparison
This model
42 in
Average
17.1 in
Low
4 in
High
50 in
Rear rim diameter comparison
This model
42 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 9120 Extra Tire Notes
Tire size note
The John Deere 9120 uses 20.8R42 on both the front and rear in this data, so the same tire-size details apply to both axles: imperial radial, 20.8 in section width, 42 in rim
Front/rear matching note
The John Deere 9120 data shows the same tire size front and rear (20.8R42). That usually makes the visible front/rear size relationship simpler, but approved tire and wheel combinations should still be checked before mixing brands or changing sizes
Official information note
Mistakes do happen. Tire sizes can change by year, axle, wheel/rim option, tyre brand, tread type and local market. Please check the tire sidewall, operator manual and official deere.com website for official information.
