Specifications:
Diameter: 4" (104 mm), 5 3/4" (146 mm) and 8" (203 mm)
Inner Hole: 7/8" (22,23 mm), but every wheel comes with the reducing spacer which reduces bore size to 12 mm; For 8" (203 mm) wheels bore diameter is 1" (25,4 mm).
Pitches used for chainsaw:
1/4, .325, 3/8 Picco
3/8, .404
Suitable machines:
Oregon, Stihl, Tecomec, Timbertuff, Jolly, Maxx, Franzen, Foley, Northern, Maxx, SIlvey, Franzen and others.