The John Deere 66 tractor tire size is front 420/70R28 and the rear is 11×4.00-5.
Front tire420/70R28
Rear tire11×4.00-5
Front/rear setupDifferent front and rear tire sizes
Rim diameter28 in front, 5 in rear
John Deere 66 Tire Size Details
Front tire size
420/70R28
Rear tire size
11×4.00-5
Front/rear setup
Different front and rear tire sizes
Original factory tire size
Front 5.00-15, Rear 11.2-34
Replacement tire size
Front 4.80×4.00-8, Rear 11×4.00-5
R1 ag tire size
12.4-24, 6.0-14
Front tire construction
Metric radial
Rear tire construction
Flotation/implement tire
Front section width
420 mm
Rear section width
4 in
Front aspect ratio
70%
Front rim diameter
28 in
Rear rim diameter
5 in
Approx front overall diameter
about 51.1 in
Approx rear overall diameter
about 11 in
Tire size alternatives / conversions
18.4-30, 460/85R30
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
5 in
Average
25.5 in
Low
0 in
High
50 in
John Deere 66 Extra Tire Notes
Tire size note
The John Deere 66 uses different front and rear tire sizes in this data: front 420/70R28 (28 in rim, 420 mm width) and rear 11×4.00-5 (5 in rim, 4 in width)
Front/rear matching note
The John Deere 66 data shows front 420/70R28 and rear 11×4.00-5. 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.
