Crowfoot Open-End Wrench

Some lockring tools put a hex on the outside of the ring so a wrench can reach it, then hide that hex inside a motor case or against a crank. A combination-wrench handle will not take that path. The 1725/2CF is Unior's open-end crowfoot for that geometry: a handle-less head with a 1/2-inch square drive on the back, sold in 32 mm and 36 mm, made to take a torque wrench from outside the obstruction.

It is two sizes, sold separately, not one head with two openings. The 32 mm opening fits the hex on 1724.SSL, Unior's Shimano STEPS lockring tool, and on 1723.SDL, the Shimano direct-mount lockring tool. Both of those pages name this crowfoot (they print it 1725/CF) plus a 1/2-inch drive torque wrench as the way to fit the lockring as specified. The 36 mm opening fits the hex on 1671.E13, the E13 bottom-bracket socket that also turns E13 chainring, spider, and cassette lockrings.

Seat the matching crowfoot on the hex, put a 1/2-inch drive torque wrench in the square, and line the handle up with the stamped mark so the opening sits perpendicular to the wrench. Unior's datasheet says that alignment is what keeps the torque reading true. The head itself is stamped ALIGN TORQUE WRENCH TO LINE.

This is not a Bosch Gen 2 lockring tool. Unior's 1726.BL2 for those motors already has an integrated 1/2-inch drive and a 24 mm hex. Do not order this crowfoot to drive that tool.

Compatibility

• 32 mm: hex flats on the Shimano STEPS lockring tool 1724.SSL and the Shimano direct-mount lockring tool 1723.SDL.
• 36 mm: hex flats on 1671.E13 (E13 bottom-bracket, chainring-spider, and cassette lockring socket).
• Drive: 1/2-inch square, both sizes.
• Not for 1726.BL2 (Bosch Gen 2). That tool is 24 mm and already has a square drive.

Specs

• Article 1725/2CF
• 32 mm (code 626645): length 65 mm, thickness 5 mm, height 71.5 mm, 112 g
• 36 mm (code 629360): length 69 mm, thickness 5 mm, height 75.8 mm, 121 g
• 1/2-inch square drive
• Stamped alignment line on the head
• Official dimensions in millimetres; weight in grams. Listed dimensions may vary in tolerance.

Built in Zreče

Unior has been forging hand tools in Zreče, Slovenia, since 1919. Unior sponsors professional road and mountain-bike race teams. The crowfoot is the small head that lets a torque wrench reach the hex those lockring tools actually present.

Pro tip from our mechanics

If the job is a STEPS chainring lockring, pick 32 mm and pair it with 1724.SSL. The Newton-metre figure comes from the motor maker, not from this page. What changes on an e-bike service, including that lockring, is in Servicing an e-bike →.

FAQ

Which size do I need, 32 mm or 36 mm? They are two separate tools. 32 mm fits the hex on Unior 1724.SSL (Shimano STEPS lockring) and 1723.SDL (Shimano direct-mount lockring). 36 mm fits the hex on 1671.E13, the E13 bottom-bracket socket that also turns E13 chainring, spider, and cassette lockrings. The official table lists only those two openings.

Does the 1725/2CF drive a Bosch Gen 2 lockring? No. Unior's Bosch Gen 2 lockring tool is 1726.BL2. That tool has its own integrated 1/2-inch drive and a 24 mm hex, so it does not use this crowfoot. The 1725/2CF datasheet's 32 mm line names 1724.SSL and 1723.SDM; the live 32 mm lockring tool that names this crowfoot is 1723.SDL.

How do I get a true torque reading with the crowfoot? Seat the crowfoot on the hex, put a 1/2-inch drive torque wrench in the square, and align the opening perpendicular to the wrench. The head is stamped ALIGN TORQUE WRENCH TO LINE. Unior says that alignment is required for a proper reading. Use the Newton-metre figure from the component maker; this page does not reprint it.

What are the official dimensions and weight? 32 mm (code 626645): length 65 mm, thickness 5 mm, height 71.5 mm, 112 g. 36 mm (code 629360): length 69 mm, thickness 5 mm, height 75.8 mm, 121 g. Both have a 1/2-inch square drive. Dimensions are in millimetres and may vary in tolerance; weight is in grams.