The John Deere 8430T tractor tire size is front 18.4-34 and the rear is 480/80R38.
Front tire18.4-34
Rear tire480/80R38
Front/rear setupDifferent front and rear tire sizes
Tire pressure17 PSI
Rim diameter34 in front, 38 in rear
John Deere 8430T Tire Size Details
Front tire size
18.4-34
Rear tire size
480/80R38
Front/rear setup
Different front and rear tire sizes
Replacement tire size
Front 380/80R38, Rear 480/80R38
R1 ag tire size
18.4R38, 14.9R30
Front tire construction
Bias/imperial tire
Rear tire construction
Metric radial
Front section width
18.4 in
Rear section width
480 mm
Rear aspect ratio
80%
Front rim diameter
34 in
Rear rim diameter
38 in
Approx rear overall diameter
about 68.2 in
Tire pressure
17 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
38 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 8430T Extra Tire Notes
Tire size note
The John Deere 8430T uses different front and rear tire sizes in this data: front 18.4-34 (34 in rim, 18.4 in width) and rear 480/80R38 (38 in rim, 480 mm width)
Pressure note
For the John Deere 8430T with front 18.4-34 and rear 480/80R38 tires, the pressure values captured in the answer are 17 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 8430T data shows front 18.4-34 and rear 480/80R38. 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.
