Shimano 41.8mm Disc Brake Caliper Fixing Bolt, for 74mm Caliper on Flat-Mount Frame Adaptor

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From Colorado Cyclist

Shimano mounting bolts for flat-mount disc brake calipers. Bolts sold individually Converter fixing bolt Bolt length: 41.8mm Chainstay thickness: 35mm Required bolt is determined by chainstay thickness, not actual bolt length