The John Deere 6400 tractor tire size is front 7.50-18 and the rear is 16.9R38.
Front tire7.50-18
Rear tire16.9R38
Front/rear setupDifferent front and rear tire sizes
Tire pressure24 PSI, 44 PSI, 12 PSI, 14 PSI
Rim diameter18 in front, 38 in rear
John Deere 6400 Tire Size Details
Front tire size
7.50-18
Rear tire size
16.9R38
Front/rear setup
Different front and rear tire sizes
Original factory tire size
Front 7.50-18, Rear 18.4-34
Replacement tire size
Front 13.6R28, Rear 16.9R38
R1 ag tire size
13.6-24, 18.4-34
Front tire construction
Bias/imperial tire
Rear tire construction
Imperial radial
Front section width
7.5 in
Rear section width
16.9 in
Front rim diameter
18 in
Rear rim diameter
38 in
Tire pressure
24 PSI, 44 PSI, 12 PSI, 14 PSI
Tire size alternatives / conversions
16.9-30, 18.4-30
Tire Size Comparison Chart
Front rim diameter comparison
This model
18 in
Average
17.1 in
Low
4 in
High
50 in
Rear rim diameter comparison
This model
38 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 6400 Extra Tire Notes
Tire size note
The John Deere 6400 uses different front and rear tire sizes in this data: front 7.50-18 (18 in rim, 7.5 in width) and rear 16.9R38 (38 in rim, 16.9 in width)
Pressure note
For the John Deere 6400 with front 7.50-18 and rear 16.9R38 tires, the pressure values captured in the answer are 24 PSI, 44 PSI, 12 PSI, 14 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 6400 data shows front 7.50-18 and rear 16.9R38. 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.
