The John Deere 6R 140 tractor tire size is front 16.9-30 and the rear is 14.9-24.
Front tire16.9-30
Rear tire14.9-24
Front/rear setupDifferent front and rear tire sizes
Tire pressure35 PSI, 18 PSI
Rim diameter30 in front, 24 in rear
Ballast50 gal
John Deere 6R 140 Tire Size Details
Front tire size
16.9-30
Rear tire size
14.9-24
Front/rear setup
Different front and rear tire sizes
Replacement tire size
Front 420/85R28, Rear 520/85R38
R1 ag tire size
420/70R24, 540/65R34
Front tire construction
Bias/imperial tire
Rear tire construction
Bias/imperial tire
Front section width
16.9 in
Rear section width
14.9 in
Front rim diameter
30 in
Rear rim diameter
24 in
Tire pressure
35 PSI, 18 PSI
Loaded rear tire ballast / fluid capacity
50 gal
Tire Size Comparison Chart
Front rim diameter comparison
This model
30 in
Average
17.1 in
Low
4 in
High
50 in
Rear rim diameter comparison
This model
24 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 6R 140 Extra Tire Notes
Tire size note
The John Deere 6R 140 uses different front and rear tire sizes in this data: front 16.9-30 (30 in rim, 16.9 in width) and rear 14.9-24 (24 in rim, 14.9 in width)
Pressure note
For the John Deere 6R 140 with front 16.9-30 and rear 14.9-24 tires, the pressure values captured in the answer are 35 PSI, 18 PSI. Tire pressure is load-dependent, so use this as a reference value rather than a universal setting
Ballast note
For the John Deere 6R 140 rear 14.9-24 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 6R 140 data shows front 16.9-30 and rear 14.9-24. 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.
