Tire Combinations - 6145R

IMPORTANT: Avoid excessive power train wear. Do not mix worn and new tires, bias and radial, or tires of different diameters. Do not use R2 tires in combination with R1.

Available tires are grouped by rolling circumference index. Rolling circumference is the distance covered by the tire in one revolution. Tires within a group, regardless of rim size, are the same or nearly the same height. Knowledge and understanding of the rolling circumference index and group size make it easier to select suitable tire combinations for the front and rear wheels.

The rolling circumference index is an important factor for correctly setting up the tractor. Since front tires are smaller than rear tires, front tires have to rotate faster to cover the same distance as the rear. Therefore it is important to select the correct size to optimize efficiency and ensure longer tire life.

The front tire must be from a group that is five group sizes smaller than the rear tire group. Example: if the rear tires are from Group 47, the front tires must be from Group 42. Rim size is irrelevant. Tires with different rim sizes such as 18.4R46 and 20.8R42 belong to the Group with the same rolling circumference, in this case 47. Tire sizes are stated in the tables below.

If you have any questions or need assistance in choosing the correct combination, see your John Deere™ dealer.

IMPORTANT: If the tire combination or tire manufacturer is changed, the transmission ratio must be ascertained. See Calculate Tire Combination.

IMPORTANT: If the transmission ratio is to be changed, the following jobs must be performed by your John Deere™ dealer:

• Change the gear pair for the front-wheel drive axle output
• Change tire size in the software of the control units
• Calibrate the radar (tractors with radar only)

FRONT TIRES
	Minimum Recommended Row Width mm (in.)
	762 (30)	812.8 (32)	1016 (40)+
	Tire width mm (in.)
Group size	420 (16.9)	480 (18.4)	520 (20.8)	620 (23.1)
43	420/85R34	480/70R34	540/65R34	—
42	16.9R30 420/90R30	480/70R30	540/65R30	600/65R28

REAR TIRES
	Minimum Recommended Row Width mm (in.)
	762 (30)	812.8 (32)	1016 (40)+
	Tire width mm (in.)
Group size	480 (18.4)	520 (20.8)	620 (24.5)	710 (28)
48	480/80R50	520/85R46	650/85R38	710/70R42
47	480/80R46	520/85R42	620/70R42	710/70R38

Tire combinations, 6145R tractor without front-wheel drive axles

Rear wheel			Front wheel
Size	SRI	Load index	Size	SRI	Load index
14.9R46	875	142A8	11.00-20 -F2	500	12PR
			14L-16.1 -F2	450	12PR
			11.00-16 -F2	450	12PR
18.4R42	875	148A8	11.00-20 -F2	500	12PR
			14L-16.1 -F2	450	12PR
			11.00-16 -F2	450	12PR
320/90R50	875	147A8	11.00-20 -F2	500	12PR
			14L-16.1 -F2	450	12PR
			11.00-16 -F2	450	12PR
420/80R46	875	151A8	11.00-20 -F2	500	12PR
			14L-16.1 -F2	450	12PR
			11.00-16 -F2	450	12PR
480/80R38	825	149A8	11.00-20 -F2	500	12PR
			14L-16.1 -F2	450	12PR
			11.00-16 -F2	450	12PR
480/80R42	875	151A8	11.00-20 -F2	500	12PR
			14L-16.1 -F2	450	12PR
			11.00-16 -F2	450	12PR
520/85R38	875	155A8	11.00-20 -F2	500	12PR
			14L-16.1 -F2	450	12PR
			11.00-16 -F2	450	12PR
650/65R38	875	157A8 157B 157B	11.00-20 -F2	500	12PR
			14L-16.1 -F2	450	12PR
			11.00-16 -F2	450	12PR

Tire combinations, 6145R tractor with front-wheel drive axles

Rear wheel			Front wheel
Size	SRI	Load index	Size	SRI	Load index
320/90R50	875	147A8	320/85R34	675	133A8
420/80R46	875	151A8	420/85R28	675	139A8
			380/85R30	675	135A8
14.9R46	875	142A8	320/85R34	675	133A8
			380/85R30	675	135A8
18.4R42	875	148A8	16.9R28	675	136A8
480/80R42	875	151A8 151B	420/85R28	675	139A8
			380/85R30	675	135A8
			320/85R34	675	133A8
650/65R38	875	157A8 157B 157B	540/65R28	675	142A8
520/85R38	875	155A8	420/85R28	675	139A8
			16.9R28		136A8
			380/85R30	675	135A8
480/80R38	825	149A8	380/85R28	650	133A8
			16.9R26	625	135A8