The John Deere 6620 Premium tractor tire size is front 14.9R28 and the rear is 18.4R38.
Front tire14.9R28
Rear tire18.4R38
Front/rear setupDifferent front and rear tire sizes
Tire pressure35 PSI, 18 PSI
Rim diameter28 in front, 38 in rear
John Deere 6620 Premium Tire Size Details
Front tire size
14.9R28
Rear tire size
18.4R38
Front/rear setup
Different front and rear tire sizes
Original factory tire size
Front 420/70R28, Rear 18.4R38
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
28 in
Rear rim diameter
38 in
Tire pressure
35 PSI, 18 PSI
Tire Size Comparison Chart
Front rim diameter comparison
This model
28 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 6620 Premium Extra Tire Notes
Tire size note
The John Deere 6620 Premium uses different front and rear tire sizes in this data: front 14.9R28 (28 in rim, 14.9 in width) and rear 18.4R38 (38 in rim, 18.4 in width)
Pressure note
For the John Deere 6620 Premium with front 14.9R28 and rear 18.4R38 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
Front/rear matching note
The John Deere 6620 Premium data shows front 14.9R28 and rear 18.4R38. 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.
