The Kubota GL-40 tractor tire size is front 8-18 and rear 12.4-28. Other tire setup data found for this model includes Front 7.2-16, Rear 12.4-24; Front 12.4-24, Rear 6.00-16, so confirm the wheel option before ordering.
Front tire8-18
Rear tire12.4-28
Front/rear setupDifferent front and rear tire sizes
Tire pressure20 PSI, 18 PSI
Rim diameter18 in front, 28 in rear
Ballast55 gal
Other setup foundFront 7.2-16, Rear 12.4-24; Front 12.4-24, Rear 6.00-16
Kubota GL-40 Tire Size Details
Front tire size
8-18
Rear tire size
12.4-28
Front/rear setup
Different front and rear tire sizes
Replacement tire size
Front 7.2-16, Rear 12.4-24
Tire size alternatives / conversions
Front 12.4-24, Rear 6.00-16
Front tire construction
Bias/imperial tire
Rear tire construction
Bias/imperial tire
Front section width
8 in
Rear section width
12.4 in
Front rim diameter
18 in
Rear rim diameter
28 in
Tire pressure
20 PSI, 18 PSI
Loaded rear tire ballast / fluid capacity
55 gal
Tire Size Comparison Chart
Front rim diameter comparison
This model
18 in
Average
18 in
Low
12 in
High
28 in
Rear rim diameter comparison
This model
28 in
Average
28 in
Low
18 in
High
38 in
Benchmarks use typical low, average and high rim diameters for the compact / utility tractor category, not scraped low/high outliers.
Kubota GL-40 Extra Tire Notes
Tire size note
The Kubota GL-40 uses different front and rear tire sizes in this data: front 8-18 (18 in rim, 8 in width) and rear 12.4-28 (28 in rim, 12.4 in width)
Multiple setup note
This data has more than one tire setup for the Kubota GL-40. The main front/rear listing is Front 8-18, Rear 12.4-28. Other setup data found: Front 7.2-16, Rear 12.4-24; Front 12.4-24, Rear 6.00-16. This usually means different wheel, axle, turf/ag/industrial, or market options rather than one universal tire size
Pressure note
For the Kubota GL-40 with front 8-18 and rear 12.4-28 tires, the pressure values captured in the answer are 20 PSI, 18 PSI. Tire pressure is load-dependent, so use this as a reference value rather than a universal setting
Ballast note
For the Kubota GL-40 rear 12.4-28 tires, the ballast figure captured in the answer is 55 gal. Liquid ballast capacity can change by tire brand, fill percentage, wheel setup and ballast fluid type
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.
