The John Deere 6630 tractor tire size is front 420/70R28 and the rear is 18.4R38.
Front tire420/70R28
Rear tire18.4R38
Front/rear setupDifferent front and rear tire sizes
Rim diameter28 in front, 38 in rear
John Deere 6630 Tire Size Details
Front tire size
420/70R28
Rear tire size
18.4R38
Front/rear setup
Different front and rear tire sizes
Front tire construction
Metric radial
Rear tire construction
Imperial radial
Front section width
420 mm
Rear section width
18.4 in
Front aspect ratio
70%
Front rim diameter
28 in
Rear rim diameter
38 in
Approx front overall diameter
about 51.1 in
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 6630 Extra Tire Notes
Tire size note
The John Deere 6630 uses different front and rear tire sizes in this data: front 420/70R28 (28 in rim, 420 mm width) and rear 18.4R38 (38 in rim, 18.4 in width)
Front/rear matching note
The John Deere 6630 data shows front 420/70R28 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.
