The John Deere 8R 440 tractor tire size is front 420/85R34 and the rear is 480/80R50.
Front tire420/85R34
Rear tire480/80R50
Front/rear setupDifferent front and rear tire sizes
Tire pressure18 PSI, 35 PSI
Rim diameter34 in front, 50 in rear
John Deere 8R 440 Tire Size Details
Front tire size
420/85R34
Rear tire size
480/80R50
Front/rear setup
Different front and rear tire sizes
Front tire construction
Metric radial
Rear tire construction
Metric radial
Front section width
420 mm
Rear section width
480 mm
Front aspect ratio
85%
Rear aspect ratio
80%
Front rim diameter
34 in
Rear rim diameter
50 in
Approx front overall diameter
about 62.1 in
Approx rear overall diameter
about 80.2 in
Tire pressure
18 PSI, 35 PSI
Tire Size Comparison Chart
Front rim diameter comparison
This model
34 in
Average
17.1 in
Low
4 in
High
50 in
Rear rim diameter comparison
This model
50 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 8R 440 Extra Tire Notes
Tire size note
The John Deere 8R 440 uses different front and rear tire sizes in this data: front 420/85R34 (34 in rim, 420 mm width) and rear 480/80R50 (50 in rim, 480 mm width)
Pressure note
For the John Deere 8R 440 with front 420/85R34 and rear 480/80R50 tires, the pressure values captured in the answer are 18 PSI, 35 PSI. Tire pressure is load-dependent, so use this as a reference value rather than a universal setting
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.
