Chain whips serve one purpose: holding a cassette in place while you loosen or tighten the lockring. Without one, the cassette just spins freely and you're not going anywhere. Park Tool's HCW-16.3 combines this essential function with a 15mm pedal wrench, which makes sense because cassette and pedal work often happen during the same service session—wheel swaps, drivetrain overhauls, or prepping a bike for travel.

The chain whip end uses a fixed section of chain riveted to a stamped steel handle. You wrap it around a cassette cog, and the handle gives you leverage to counteract the force from your lockring tool. The 15mm pedal wrench on the opposite end provides the reach and leverage needed for stubborn pedal spindles, which tend to seize up if they've been installed without anti-seize compound or left in place for a few seasons. The slim profile of the wrench end fits into the tight space between the pedal spindle flats and the crankarm without marking up your components.

One thing to note: the chain section on this tool fits 5 to 12-speed cassettes. If you're working on older freewheels or need to hold a cassette while installing it, this handles both directions. The 15mm pedal flat is the standard size for the vast majority of pedals on the market—BMX pedals sometimes use different sizes, but road and mountain pedals almost universally use 15mm flats or hex interfaces.... Read More