Select Tire Combinations

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.

Tractors built with Group 47/48 tires may not be converted to Group 49 rear tires and tractors built with Group 49 tires may not be converted to Group 47/48 tires as these changes effect chassis and cab heights.

Mismatched front and rear tire combinations may cause poor performance and other problems. If unable to replace tires with same size as original equipment, consult your John Deere™ dealer or tire supplier for guidance.

Tires are placed into groups by their Rolling Circumference Index (RCI). Rolling circumference is distance tread travels in one revolution. Tires within a group, regardless of rim size, are same or nearly same diameter.

Since front tires are smaller than rear tires, front tires have to rotate faster to cover same distance as rear. Select correct size to optimize efficiency and ensure longer tire life.

Front tire must be from a group five group sizes smaller than rear tire group. For example, if rear tires are group 47, front tires must be group 42. Rim size is of no consequence. Different rim size tires such as 480/80R46 and 520/85R42 have same rolling circumference group, which is 47. Tire sizes are found in following tables.

FRONT TIRES
Minimum Recommended Row Width mm (in.)
Front Tires		508 mm (20 in.)	559 mm (22 in.)	762 mm (30 in.)	813 mm (32 in.)
Front Tire Section Width mm (in.)
RCI Group Size	Approximate Outside Diameter	320 mm (12.6 in.)	380 mm (15 in.)	420 mm (16.5 in.)	480 mm (18.9 in.)	540 mm (21.3 in.)	600 mm (23.6 in.)	620 mm (24.4 in.)
42	1499 mm (59 in.)	320/85R38	380/85R34	420/90R30	480/70R30		600/65R28
43	1600 mm (63 in.)	320/80R42 IF320/80R42	380/80R38 IF380/80R38	420/85R34 IF420/85R34	IF480/70R34	540/65R34	600/70R30 IF600/70R30
44	1676 mm (66 in.)		380/80R42	420/85R38		540/75R34	600/65R34	620/75R30 IF620/75R30

REAR TIRES
Minimum Recommended Row Width mm (in.)
Rear Tires		508 mm (20 in.)	559 mm (22 in.)	762 mm (30 in.)	813 mm (32 in.)
Rear Tire Section Width mm (in.)
RCI Group Size	Approximate Outside Diameter	320 mm (12.6 in.)	380 mm (15 in.)	480 mm (18.9 in.)	520 mm (20.5 in.)	620 mm (24.4 in.)	650 mm (25.6 in.)	710 mm (28 in.)	800 mm (31.5 in.)
47	1956 mm (77 in.)	320/90R541	380/90R50	480/80R46	520/85R42	620/70R42	650/65R42	710/70R38
48	2057 mm (81 in.)	320/105R54	380/90R54	480/80R50 IF480/80R50	520/85R46	620/70R46	650/85R38 IF650/85R38	710/70R42 IF710/70R42	800/70R38 IF800/70R38
49	2172 mm (85.5 in.)			480/95R50				710/75R42 IF710/75R42

NOTE: If tire group change is desired, see your John Deere™ dealer.