Park Tool, SR-18.2, Chain whip, for 1/8'' cogs

The Park Tool SR-18.2 Sprocket Remover / Chain Whip is a professional-grade workshop tool specifically designed to hold oversized 1/8-inch single-speed cogs. This indispensable tool is a must-have for track cyclists, fixed-gear riders, and single-speed mechanics who need to safely install or remove rear sprockets.

Key Features

• Oversized Cog Compatibility:
  Equipped with a premium, heavy-duty 1/8" width bike chain segment, this tool securely wraps around track bike cogs, single-speed cassette sprockets, and BMX driver teeth.
• Integrated 1" Box Wrench:
  The bottom of the handle features a 1-inch (25.4mm) hex opening, acting as a companion driver to cleanly turn Park Tool freewheel or cassette lockring tools (e.g., FR-6 or FR-8).
• Industrial Hardened Build:
  Heat-treated to resist bending, flexing, or warping under extreme torque, common with fixed-gear lockrings. The chain is secured with specialized hardened pins to ensure a tight link layout.
• Extended Ergonomic Handle:
  At 14 inches (35.5 cm) long, the vinyl-coated handle provides extra mechanical leverage and a cushioned grip, making it comfortable to loosen frozen track cogs.

User Sentiment & Performance

Mechanics and fixed-gear enthusiasts highly rate this tool for its precision and durability.

• No Roll-Over Risk:
  Standard multi-speed chain whips often twist and slip off thick 1/8" track cogs, but the SR-18.2 locks flush to the teeth, eliminating the risk of damaged cogs or scraped knuckles.
• Track Bike Lifesaver:
  Track racers value the double-ended leverage, which allows them to steady the cog with the whip while slotting the lockring wrench into the base—making gear swaps at the velodrome fast and efficient.