The John Deere X949 tractor tire size is front 18×8.50-8 and the rear is 26×12.00-12.
Front tire18×8.50-8
Rear tire26×12.00-12
Front/rear setupDifferent front and rear tire sizes
Tire pressure12 PSI, 14 PSI
Rim diameter8 in front, 12 in rear
Ballast120 gal
John Deere X949 Tire Size Details
Front tire size
18×8.50-8
Rear tire size
26×12.00-12
Front/rear setup
Different front and rear tire sizes
Replacement tire size
Front 15×6.00-6, Rear 20×10.00-8
R1 ag tire size
23×10.50-12, 26×12-12
Front tire construction
Flotation/implement tire
Rear tire construction
Flotation/implement tire
Front section width
8.5 in
Rear section width
12 in
Front rim diameter
8 in
Rear rim diameter
12 in
Approx front overall diameter
about 18 in
Approx rear overall diameter
about 26 in
Tire pressure
12 PSI, 14 PSI
Loaded rear tire ballast / fluid capacity
120 gal
Tire Size Comparison Chart
Front rim diameter comparison
This model
8 in
Average
17.1 in
Low
4 in
High
50 in
Rear rim diameter comparison
This model
12 in
Average
25.5 in
Low
0 in
High
50 in
John Deere X949 Extra Tire Notes
Tire size note
The John Deere X949 uses different front and rear tire sizes in this data: front 18×8.50-8 (8 in rim, 8.5 in width) and rear 26×12.00-12 (12 in rim, 12 in width)
Pressure note
For the John Deere X949 with front 18×8.50-8 and rear 26×12.00-12 tires, the pressure values captured in the answer are 12 PSI, 14 PSI. Tire pressure is load-dependent, so use this as a reference value rather than a universal setting
Ballast note
For the John Deere X949 rear 26×12.00-12 tires, the ballast figure captured in the answer is 120 gal. Liquid ballast capacity can change by tire brand, fill percentage, wheel setup and ballast fluid type
Front/rear matching note
The John Deere X949 data shows front 18×8.50-8 and rear 26×12.00-12. 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.
