The John Deere 8400 tractor tire size is front 14.9R34 and the rear is 18.4R46.
Front tire14.9R34
Rear tire18.4R46
Front/rear setupDifferent front and rear tire sizes
Rim diameter34 in front, 46 in rear
John Deere 8400 Tire Size Details
Front tire size
14.9R34
Rear tire size
18.4R46
Front/rear setup
Different front and rear tire sizes
Front tire construction
Imperial radial
Rear tire construction
Imperial radial
Front section width
14.9 in
Rear section width
18.4 in
Front rim diameter
34 in
Rear rim diameter
46 in
Tire size alternatives / conversions
18.4R46, 20.8R42
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
46 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 8400 Extra Tire Notes
Tire size note
The John Deere 8400 uses different front and rear tire sizes in this data: front 14.9R34 (34 in rim, 14.9 in width) and rear 18.4R46 (46 in rim, 18.4 in width)
Front/rear matching note
The John Deere 8400 data shows front 14.9R34 and rear 18.4R46. 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.
