A high quality 20" ring gear manufactured in India by Leyland Ashok. This ring gear has been sourced specifically for use in our electric starting kits but could be used with other engines if required. It is supplied pre drilled for bolt fixing to the flywheel rim and conforms to the following specifications. Outside diameter = 509.88 ± 0.20 mm Inside diameter = 444.52 ± 0.10 mm Thickness = 22.22 ± 0.20 mm Number of teeth = 159 nos. Pressure angle = 20º Diametric pitch = 8/10 Whole tooth depth = 5.72 Surface hardness = 45 to 55 HRC at PCD. Material = C50 Hole PCD = 460.5mm on face Hole ID = 10.5 mm on face No. of holes = 12 Nos. on face