Square Taper & Splined Crank Puller w/Handle

The 1661/4 in our catalogue is the bench puller: combined square taper plus splined-adapter coverage on a body designed for a separate wrench. The 1661.3/4P-US is the same logic packaged for field service: an integrated 6.5″ handle bolted permanently to the puller body, no separate 17 mm wrench in the kit, no fishing through a tool roll for the right open-end. Pick this up, thread it in, turn.

The choice between the two is workflow. If a torque wrench or socket lives next to the bench, the 1661/4 lets the bench wrench drive the puller and saves the integrated handle's bulk. If the puller travels (race-day pit, mobile-mechanic kit, garage workshop without a dedicated wrench wall), the 1661.3/4P-US is what gets the crank off without a second tool.

How it's used

Remove the crank centre bolt first (14 mm or 15 mm hex on square-taper cranks; 8 mm hex on most splined cranks). For square-taper cranks with a dust cap, pry or unscrew the cap before threading in the puller; pulling against the cap rather than the threaded crank arm strips threads on the first try.

Thread the 1661.3/4P-US into the crank arm's puller threads, hand-tight, then snug with the integrated handle. The handle gives 6.5″ of leverage; enough to break free a stuck crank without needing a cheater bar in most cases. Turn the centre rod clockwise; the rod drives against the spindle face and pushes the crank arm outward.

For ISIS Drive and Shimano Octalink cranks, slide the included splined adapter onto the centre rod before threading in. The adapter prevents the rod from punching into the splined hollow at the spindle end and gives the rod a flat face to press against.

Compatibility

• All current and legacy square-taper cranks (Shimano, FSA, Race Face, Truvativ square-taper, generic JIS and ISO tapers)
• ISIS Drive (Truvativ, Race Face, FSA, Stronglight) using the included splined adapter
• Shimano Octalink V1 and V2 using the same splined adapter
• M22 × 1.0 puller threads (industry-standard for square taper and splined cranks)

Specs

• Material: premium flex plus carbon steel, drop-forged, hardened and tempered
• Surface finish: chrome-plated to ISO 1456:2009
• Handle length: 6.5″ (165 mm), integrated
• Puller thread: M22 × 1.0
• Includes: splined adapter for ISIS and Octalink

Built in Zreče

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The integrated handle on the 1661.3/4P-US isn't a separate part welded on; it's part of the puller body's drop-forged structure. That's why the handle holds true under the load of pulling a properly stuck crank where a press-on handle would loosen at the joint.

Pro tip from our mechanics

A 6.5″ handle is enough leverage for almost every stuck crank we see. If the crank still won't release with the integrated handle fully loaded, the issue isn't leverage; it's that the puller threads in the crank arm have already let go, and the centre rod is spinning without engagement. Step to the 1662/4 Square Taper Crank Puller with its tapered puller threads, or use the Crank Saver Kit (1695MB1-US) to ream the threads and press in a fresh steel insert.

For the field-versus-bench tool choice and the full removal procedure across all four crank interfaces: How to remove a crankset →.