Quick view ECR Performance ECR Performance Universal 60-2 Crank Trigger Wheel Universal 60-2 Trigger Wheel 5-1/2" (139.7 mm) OD Diameter 5-1/8"ID (130.175 mm) Diameter 3-1/8" (79.375 mm) Center Hole Diameter 1/2" (12.7 mm)Teeth Thickness MSRP: Was: Now: $62.98