The Kubota B1181 tractor tire size is front 5-12 and rear 280/70R18. Other tire setup data found for this model includes Front 6.00-12, Rear 8.3-16; Front 5-12, Rear 8-16; Front 8-16, Rear 8-16, so confirm the wheel option before ordering.
Front tire5-12
Rear tire280/70R18
Front/rear setupDifferent front and rear tire sizes
Tire pressure17 PSI, 20 PSI
Rim diameter12 in front, 18 in rear
Ballast35 gal
Other setup foundFront 6.00-12, Rear 8.3-16; Front 5-12, Rear 8-16; Front 8-16, Rear 8-16
Kubota B1181 Tire Size Details
Front tire size
5-12
Rear tire size
280/70R18
Front/rear setup
Different front and rear tire sizes
Other tire setup found
Front 6.00-12, Rear 8.3-16
Replacement tire size
Front 5-12, Rear 8-16
Tire size alternatives / conversions
Front 8-16, Rear 8-16
Front tire construction
Bias/imperial tire
Rear tire construction
Metric radial
Front section width
5 in
Rear section width
280 mm
Rear aspect ratio
70%
Front rim diameter
12 in
Rear rim diameter
18 in
Approx rear overall diameter
about 33.4 in
Tire pressure
17 PSI, 20 PSI
Loaded rear tire ballast / fluid capacity
35 gal
Tire Size Comparison Chart
Front rim diameter comparison
This model
12 in
Average
12 in
Low
8 in
High
16 in
Rear rim diameter comparison
This model
18 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 B1181 Extra Tire Notes
Tire size note
The Kubota B1181 uses different front and rear tire sizes in this data: front 5-12 (12 in rim, 5 in width) and rear 280/70R18 (18 in rim, 280 mm width)
Multiple setup note
This data has more than one tire setup for the Kubota B1181. The main front/rear listing is Front 5-12, Rear 280/70R18. Other setup data found: Front 6.00-12, Rear 8.3-16; Front 5-12, Rear 8-16; Front 8-16, Rear 8-16. This usually means different wheel, axle, turf/ag/industrial, or market options rather than one universal tire size
Pressure note
For the Kubota B1181 with front 5-12 and rear 280/70R18 tires, the pressure values captured in the answer are 17 PSI, 20 PSI. Tire pressure is load-dependent, so use this as a reference value rather than a universal setting
Ballast note
For the Kubota B1181 rear 280/70R18 tires, the ballast figure captured in the answer is 35 gal. Liquid ballast capacity can change by tire brand, fill percentage, wheel setup and ballast fluid type
Front/rear matching note
The Kubota B1181 data shows front 5-12 and rear 280/70R18. 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.
