The John Deere 6425 tractor tire size is front 420/70R24 and the rear is 18.4R30.
Front tire420/70R24
Rear tire18.4R30
Front/rear setupDifferent front and rear tire sizes
Tire pressure35 PSI, 18 PSI
Rim diameter24 in front, 30 in rear
John Deere 6425 Tire Size Details
Front tire size
420/70R24
Rear tire size
18.4R30
Front/rear setup
Different front and rear tire sizes
Original factory tire size
Front 7.50R18, Rear 18.4R30
Replacement tire size
Front 7.50R18, Rear 18.4R30
R1 ag tire size
7.50R18, 18.4R30
Front tire construction
Metric radial
Rear tire construction
Imperial radial
Front section width
420 mm
Rear section width
18.4 in
Front aspect ratio
70%
Front rim diameter
24 in
Rear rim diameter
30 in
Approx front overall diameter
about 47.1 in
Tire pressure
35 PSI, 18 PSI
Tire size alternatives / conversions
16.9R34, 420/85R34, 18.4-38, 460/85R38
Tire Size Comparison Chart
Front rim diameter comparison
This model
24 in
Average
14.8 in
Low
6 in
High
28 in
Rear rim diameter comparison
This model
30 in
Average
22.2 in
Low
6 in
High
38 in
John Deere 6425 Extra Tire Notes
Tire size note
The John Deere 6425 uses different front and rear tire sizes in this data: front 420/70R24 (24 in rim, 420 mm width) and rear 18.4R30 (30 in rim, 18.4 in width)
Pressure note
For the John Deere 6425 with front 420/70R24 and rear 18.4R30 tires, the pressure values captured in the answer are 35 PSI, 18 PSI. Tire pressure is load-dependent, so use this as a reference value rather than a universal setting
Front/rear matching note
The John Deere 6425 data shows front 420/70R24 and rear 18.4R30. When changing either size, front/rear rolling circumference and lead/lag need to stay within the correct range
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.
