External Retaining Ring Circlip Pliers

External retaining rings sit on a shaft and hold a part against an external shoulder; a seal carrier on an air-spring shaft, a bearing on a derailleur pulley, a retainer on a brake-lever pivot. They are the most common retaining-ring class in modern bicycle service, and removing them requires pliers whose jaws spread on squeeze, not close. The 532PLUS/1DP-US is the straight-jaw external-ring pliers built for the standard-position access on a shaft.

The jaw tips drop into the ring's outer holes; squeezing the handles spreads the jaws apart, expanding the ring outward and freeing it from the shaft groove. Release the squeeze, the ring snaps back to its retaining diameter. The motion is the opposite of the internal pliers; the workflow is the same.

What we use it for, in the shop

• External rings on air-spring shafts retaining seal carriers and end stops.
• External rings on derailleur pulley axles and jockey-wheel shafts.
• External rings on brake-lever pivot pins and shifter-internal pivots.
• External rings on every shaft-mounted retaining ring where the access is from a direct, unobstructed angle.

Pairs with the internal-ring 536PLUS/1DP-US; a full circlip-pliers workshop owns both internal and external, since the same service often calls for one of each.

Specs

• Jaw geometry: straight, external (jaws spread on squeeze, expanding the ring)
• Material: premium plus carbon steel, drop-forged
• Heat treatment: hardened and tempered
• Finish: trivalent chrome plated to ISO 1456:2009
• Article: 532PLUS/1DP-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. Straight-jaw geometry for external rings; axle ends, shafts, every retaining ring on a lever or pulley. The drop-forged premium plus carbon steel keeps the jaw tips sharp across years of seal-carrier and bearing-retainer service; trivalent chrome plating per ISO 1456:2009 keeps the finish through workshop solvent and grease without flaking.

Pro tip from our mechanics

External rings retain seal carriers, and the seal carriers register the seal-driver depth on a deeper-than-lower-legs service. The procedure does not call for this tool at the home interval. The next service interval, into the air-spring assembly, is when this tool earns its spot in the drawer.

How to service your suspension fork's lower legs →