MINI Mechanical Speedometer with Black Interface M=2.1 Ratio for Harley and Custom Motorcycles 1-7/8" MINI Mechanical Speedometer with Black Interface M=2.1 This high quality mini speedo measures 1-7/8" overall in diameter (1-5/8" face) and 2" long.Clean custom style.Super compact size2240:60 Ratio Odometer Features:Illuminated face Polished stainless housing and bezelmechanical odometer140mph faceMounting clamp Will fit any motorcycle or a custom project. *Product ID = 55