The Kubota Z121S tractor tire size is front 11×4-5 and rear 22×10-14. Other tire setup data found for this model includes Front 12.4-16, Rear 23×8.50-12, so confirm the wheel option before ordering.
Front tire11×4-5
Rear tire22×10-14
Front/rear setupDifferent front and rear tire sizes
Tire pressure14 PSI, 10 PSI
Rim diameter5 in front, 14 in rear
Other setup foundFront 12.4-16, Rear 23×8.50-12
Kubota Z121S Tire Size Details
Front tire size
11×4-5
Rear tire size
22×10-14
Front/rear setup
Different front and rear tire sizes
R1 ag tire size
Front 12.4-16, Rear 23×8.50-12
Front tire construction
Flotation/implement tire
Rear tire construction
Flotation/implement tire
Front section width
4 in
Rear section width
10 in
Front rim diameter
5 in
Rear rim diameter
14 in
Approx front overall diameter
about 11 in
Approx rear overall diameter
about 22 in
Tire pressure
14 PSI, 10 PSI
Tire Size Comparison Chart
Front rim diameter comparison
This model
5 in
Average
12 in
Low
8 in
High
16 in
Rear rim diameter comparison
This model
14 in
Average
16 in
Low
12 in
High
24 in
Benchmarks use typical low, average and high rim diameters for the sub-compact / compact tractor category, not scraped low/high outliers.
Kubota Z121S Extra Tire Notes
Tire size note
The Kubota Z121S uses different front and rear tire sizes in this data: front 11×4-5 (5 in rim, 4 in width) and rear 22×10-14 (14 in rim, 10 in width)
Multiple setup note
This data has more than one tire setup for the Kubota Z121S. The main front/rear listing is Front 11×4-5, Rear 22×10-14. Other setup data found: Front 12.4-16, Rear 23×8.50-12. This usually means different wheel, axle, turf/ag/industrial, or market options rather than one universal tire size
Pressure note
For the Kubota Z121S with front 11×4-5 and rear 22×10-14 tires, the pressure values captured in the answer are 14 PSI, 10 PSI. Tire pressure is load-dependent, so use this as a reference value rather than a universal setting
Front/rear matching note
The Kubota Z121S data shows front 11×4-5 and rear 22×10-14. 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 kubotausa.com website for official information.
