The John Deere 3420 tractor tire size is front 4.00-15 and the rear is 9.5-32.
Front tire4.00-15
Rear tire9.5-32
Front/rear setupDifferent front and rear tire sizes
Tire pressure14 PSI, 30 PSI
Rim diameter15 in front, 32 in rear
John Deere 3420 Tire Size Details
Front tire size
4.00-15
Rear tire size
9.5-32
Front/rear setup
Different front and rear tire sizes
Original factory tire size
Front 4.00-15, Rear 9.5-34
R1 ag tire size
7.00-12, 12.4-24
Front tire construction
Bias/imperial tire
Rear tire construction
Bias/imperial tire
Front section width
4 in
Rear section width
9.5 in
Front rim diameter
15 in
Rear rim diameter
32 in
Tire pressure
14 PSI, 30 PSI
Tire Size Comparison Chart
Front rim diameter comparison
This model
15 in
Average
17.1 in
Low
4 in
High
50 in
Rear rim diameter comparison
This model
32 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 3420 Extra Tire Notes
Tire size note
The John Deere 3420 uses different front and rear tire sizes in this data: front 4.00-15 (15 in rim, 4 in width) and rear 9.5-32 (32 in rim, 9.5 in width)
Pressure note
For the John Deere 3420 with front 4.00-15 and rear 9.5-32 tires, the pressure values captured in the answer are 14 PSI, 30 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 3420 data shows front 4.00-15 and rear 9.5-32. 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.
