Universal Single-Speed Freewheel Remover

Anyone who's worked a shop bench knows the freewheel-tool problem. The first drawer has half a dozen patterns; Shimano 4-spline, SunTour 2-prong, SunTour 4-prong, BMX 4-pin, Sachs, the one nobody can identify; and the freewheel that just rolled in has engagement notches rounded off enough that none of them seat. The 1722/2BI-US is the answer for the freewheel that won't take any of the dedicated tools: a body clamp that grips the freewheel's outer perimeter rather than engaging a spline pattern, with a long handle for the leverage to spin it off the hub.

The clamp design is what makes this universal. Spline- and prong-style freewheel tools depend on intact engagement points; a freewheel that's been turned past those points by a wrong-sized tool, or a freewheel from a vintage drivetrain whose tool pattern was never common in the US market, has nothing for those tools to grip. The 1722/2BI-US ignores the engagement points entirely. The clamp tightens against the freewheel body wall, and the handle does the spinning.

It's the tool of last resort for stuck or unidentifiable freewheels, and it's the tool of first resort for shops that don't want to inventory five different prong patterns.

How to use it

Open the clamp and seat it over the freewheel body. Tighten the clamp until it grips firmly; firmly enough that the freewheel body doesn't rotate inside the clamp, not so tight that the freewheel body deforms. Hold the wheel by the rim or in a workstand-mounted dishing fork. Turn the handle counter-clockwise (the same direction every freewheel backs off).

Note: the 1722/2BI-US is for removal. Freewheels self-tighten through pedaling, so a freshly removed freewheel reinstalls by hand-threading onto the hub with a touch of anti-seize. The first hard pedal stroke after wheel install snugs it to working torque.

Compatibility

• Single-speed and multispeed threaded freewheels of essentially any pattern
• Particularly useful for freewheels with rounded or non-standard engagement points
• Works on freewheel bodies up to the clamp's maximum diameter (most current and legacy freewheels)
• Not for cassettes (use the appropriate cassette lockring tool; 1670.5/4 for Shimano/SRAM, 1670.4/4 for Campagnolo)

Specs

• Body-clamp engagement (not spline- or prong-dependent)
• Long handle for leverage on stuck freewheels
• Trivalent chrome plated to ISO 1456:2009
• Bi-material handle grip
• Article number: 1722/2BI-US

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The 1722/2BI-US is in the catalog because the freewheel-tool drawer in most shops is honest about its limits; five drawers of dedicated tools still won't fit a sixth pattern that walks in the door. A body-clamp design is the universal-translator solution. It's slower than a dedicated tool when one is the right fit; it's the only thing that works when none of them are.

Pro tip from our mechanics

The 1722/2BI-US has saved more freewheels from "had to cut it off with an angle grinder" than any other tool we own. If the customer's bike has been sitting in a garage long enough that the freewheel is corroded onto the hub, the clamp can apply more sustained torque than a prong tool can without slipping. We've kept freewheels worth saving; vintage Maillard, Sachs hubs, irreplaceable parts; that the dedicated tools couldn't touch. The cassette-replacement workflow has more on the cassette-vs-freewheel call and which tool fits which: When and how to replace your cassette →