The John Deere Q 85 tractor tire size is front 11×4.00-5 and the rear is 85-24.
Front tire11×4.00-5
Rear tire85-24
Front/rear setupDifferent front and rear tire sizes
Tire pressure30 PSI, 36 PSI
Rim diameter5 in front, 24 in rear
John Deere Q 85 Tire Size Details
Front tire size
11×4.00-5
Rear tire size
85-24
Front/rear setup
Different front and rear tire sizes
Original factory tire size
Front 70-20, Rear 70-24
Replacement tire size
Front 15×6.00-6, Rear 18×8.50-8
Front tire construction
Flotation/implement tire
Rear tire construction
Bias/imperial tire
Front section width
4 in
Rear section width
85 in
Front rim diameter
5 in
Rear rim diameter
24 in
Approx front overall diameter
about 11 in
Tire pressure
30 PSI, 36 PSI
Tire Size Comparison Chart
Front rim diameter comparison
This model
5 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 Q 85 Extra Tire Notes
Tire size note
The John Deere Q 85 uses different front and rear tire sizes in this data: front 11×4.00-5 (5 in rim, 4 in width) and rear 85-24 (24 in rim, 85 in width)
Pressure note
For the John Deere Q 85 with front 11×4.00-5 and rear 85-24 tires, the pressure values captured in the answer are 30 PSI, 36 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 Q 85 data shows front 11×4.00-5 and rear 85-24. 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.
