COGS

 Fits Shimano freehub bodies 7mm thick base to prevent damage to alloy freehub under heavy loads Centric teeth allow flipping of cog to double the lifespan Narrow/wide tooth profile helps prevent dropped chains Long lasting durability 16T Black 23g

 Fits Shimano freehub bodies 7mm thick base to prevent damage to alloy freehub under heavy loads Centric teeth allow flipping of cog to double the lifespan Narrow/wide tooth profile helps prevent dropped chains Long lasting durability 18T Black 24g

 Fits Shimano freehub bodies 7mm thick base to prevent damage to alloy freehub under heavy loads Centric teeth allow flipping of cog to double the lifespan Narrow/wide tooth profile helps prevent dropped chains Long lasting durability 20T Black 29g

 CNC 7075 Alloy Replaces one cog of a Shimano cassette for greater range Must be used with medium (1x) or long cage derailleurs (2x) Compatible with SLX*, XT, and XTR 10sp cassettes *SLX cassette only allows replacement of 11T cog and requires special lock ring (#180049) 40T Black 75g

 CNC-machined from long-wearing 7075-T6 aluminum alloy Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Alloy cogs are anodized black with laser-etched graphics 18T Black 18g

 CNC-machined from long-wearing 7075-T6 aluminum alloy Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Alloy cogs are anodized black with laser-etched graphics 17T Black 16g

 CNC-machined from long-wearing 7075-T6 aluminum alloy Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Alloy cogs are anodized black with laser-etched graphics 16T Black 14g

 CNC-machined from long-wearing 7075-T6 aluminum alloy Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Alloy cogs are anodized black with laser-etched graphics 15T Black 13g

 CNC-machined from long-wearing 7075-T6 aluminum alloy Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Alloy cogs are anodized black with laser-etched graphics 13T Black 8g

 CNC-machined from long-wearing 7075-T6 aluminum alloy Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Alloy cogs are anodized black with laser-etched graphics 14T Black 11g

 CNC-machined chromoly construction Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Electro plated black with laser-etched logos 14T Black 11g

 CNC-machined chromoly construction Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body Electro plated black with laser-etched logos 13T Black 8g