I have the ag tires set at the widest setting and it is still less than 60" to the outside of the tires..
The 3005 is physically a smaller tractor than the 3x20 series. Your
owner manual states
[h=3]2WD Front Tire Tread Width[/h] Tread Width (5.00-15) 956 mm (37.6 in.)
Tread Width (25 x 8.50-14 4PR) 985 mm (38.7 in.)
Tire Width (5.00-15) 160 mm (6.3 in.)
Tire Width (25 x 8.50-14) 185 mm (7.3 in.)
Inside Tire Width (5.00-15) 830 mm (32.7 in.)
Inside Tire Width (25 x 8.50-14) 770 mm (30.3 in.)
Outside Tire Width (5.00-15) 1150 mm (45.3 in.)
Outside Tire Width (25 x 8.50-14) 1180 mm (46.5 in.)
[h=3]MFWD Front Tire Tread Width[/h] Tread Width (7.00-14) 986 mm (38.8 in.)
Tread Width (25 x 8.50-14 4PR) 985 mm (38.7 in.)
Tire Width (7.00-14) 160 mm (6.3 in.)
Tire Width (25 x 8.50-14 4PR) 185 mm (7.3 in.)
Inside Tire Width (7.00-14) 820 mm (32.3 in.)
Inside Tire Width (25 x 8.50-14 4PR) 770 mm (30.3 in.)
Outside Tire Width (7.00-14) 1190 mm (46.9 in.)
Outside Tire Width (25 x 8.50-14 4PR) 1180 mm (46.5 in.)
[h=3]2WD and MFWD Rear Tire Tread Width[/h] Tread Width (11.2-24) 1016 mm (40 in.)
Tread Width (13.6-16) 1020 mm (40.2 in.)
Tread Width (15.0-19.5) 1140 mm (44.9 in.)
Tire Width (11.2-24) 240 mm (9.4 in.)
Tire Width (13.6-16) 280 mm (11.0 in.)
Tire Width (15.0-19.5) 320 mm (12.6 in.)
Inside Tire Width (11.2-24) 780 mm (30.7 in.)
Inside Tire Width (13.6-16) 675 mm (26.6 in.)
inside Tire Width (15.0-19.5) 745 mm (29.3 in.)
Outside Tire Width (11.2-24) 1350 mm (53.2 in.)
Outside Tire Width (13.6-16) 1340 mm (52.8 in.)
Outside Tire Width (15.0-19.5) 1490 mm (58.7 in.)
and
Changing Wheel Spacing and Tread Width
To provide best stability, operate machine with rear wheels mounted in the wide tread position whenever possible.
Always make sure tires rotate in proper direction. Arrows on sidewall should point in direction of forward rotation.
• Move wheel from one side of machine to the other (A) to maintain proper direction of tire rotation.
• Tighten front wheel bolts alternately to 133 N•m (98 lb-ft). Tighten rear wheel bolts alternately to 186 N•m (137 lb-ft). Check and retighten bolts as instructed in service section.
• Tread width is measured between centers of tires. See SPECIFICATIONS for proper dimensions.
So if you're at 58.7", it would seem that's all you're gonna get - without spacers.
//greg//