The 2006 model had a measured top speed of 178 mph (286 km/h) I just got my suzuki service manual on thursday So i'm buzzing thru it and wanted to share what i came up with regarding the k5's top speed Speed = (13,500 rpm x 76 in Rear tire circumference x 17 front sprocket) ÷ (1.553 primary gear ratio x 1.269 sixth gear ratio x 42 rear sprocket x 1056).
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