2004-2005 660 Yamaha Rhino Factory Service Manual, Page 41Get this manual
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CHASSIS SPECIFICATIONS Item Front disc brake Type Disc outside diameter thickness Pad thickness inner Pad thickness outer Standard Dual 200 3.5 mm (7.87 0.14 in) 5.2 mm (0.20 in) 5.2 mm (0.20 in) 17.4