BlackStar 40BS80 1 1/8 K2S - 40 Pitch Finished Bore Sprocket - 80 Tooth - 1-1/8" Bore 3.11/16" so a 25T5/545R from any

so a 25T5/545R from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

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Continental C176

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"mpn":"300-S8M-1840-D&D"

BlackStar 40BS80 1 1/8 K2S - 40 Pitch Finished Bore Sprocket - 80 Tooth - 1-1/8" Bore 3.11/16" so a 25T5/545R from anyThe BlackStar 40BS80 1 1 8 K2S is a 40 pitch Finished Bore roller chain sprocket with 80 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 8" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 40BS80 1 1 8 K2S Chain Pitch 40 Number of Teeth 80 Bore Size 1 1 8" Minimum Bore 3 4" Maximum Bore 1 1 2" Bore