The John Deere 8430 tractor tire size is front 18.4-34 and the rear is 18.4-34.
Front tire18.4-34
Rear tire18.4-34
Front/rear setupSame front and rear tire size
Rim diameter34 in front/rear
Ballast50 gal
John Deere 8430 Tire Size Details
Front tire size
18.4-34
Rear tire size
18.4-34
Front/rear setup
Same front and rear tire size
R1 ag tire size
18.4-34, 14.9-24
Tire construction
Bias/imperial tire
Section width
18.4 in
Rim diameter
34 in
Loaded rear tire ballast / fluid capacity
50 gal
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
34 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 8430 Extra Tire Notes
Tire size note
The John Deere 8430 uses 18.4-34 on both the front and rear in this data, so the same tire-size details apply to both axles: bias/imperial tire, 18.4 in section width, 34 in rim
Ballast note
For the John Deere 8430 rear 18.4-34 tires, the ballast figure captured in the answer is 50 gal. Liquid ballast capacity can change by tire brand, fill percentage, wheel setup and ballast fluid type
Front/rear matching note
The John Deere 8430 data shows the same tire size front and rear (18.4-34). That usually makes the visible front/rear size relationship simpler, but approved tire and wheel combinations should still be checked before mixing brands or changing sizes
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.
