Chain Rider Set Product Type Chain Rider Set For Chain Number 60 For Number of Strands Single For Chain Pitch 3/4 in Chain Rider Width 72 mm Idler Bolt Thread Size M12 Idler Hole System of Measurement Metric Length through Bore 80 mm Number of Chain Riders 1 Standards ANSI DIN 8187 ISO 12 B-1 Bearing Closure Double Shielded Bore Diameter 12 1/2 mm Chain Number 60 Compatible with Brand Rosta Compatible with Series 27-38