John Deere Wheel Spacer Set. The optional wheel spacers extend the rear tread setting by 2.4 inch on each side, further increasing stability, operator confidence and overall productivity. The maximum overall width of the tractor with optional wheel spacers is 59.8-inches. Click here to preview Installation Instructions. Complete Repair Service Technical Manual for John Deere Tractors 6215, 6415, 6615 , 6715, with all the workshop information to maintain, repair, and service like professional mechanics. John Deere 2WD or MFWD Tractors 6215, 6415, 6615, 6715 official workshop technical manual (repair) includes: * Numbered table of contents easy. 1.75" Wide Wheel.