Cone Wrench Set

Twelve Unior cone wrenches in a single workshop set, covering the bike-relevant cup-and-cone hub bearing size range from 13 mm to 28 mm. The complete kit for setting hub bearing preload on cup-and-cone hubs across road, MTB, and BMX builds; sizes for Shimano, Campagnolo, FSA, and almost every legacy hub the bench will see.

A cone wrench is a thin-jaw open-end wrench sized to slip between the hub's cone nut and locknut. Cup-and-cone bearings need the cone preload adjusted to a specific value; tight enough that the bearings don't have axial play, loose enough that they don't drag. Setting the preload uses two cone wrenches simultaneously: one holds the cone, the other tightens the locknut against it. The set's twelve sizes cover the size-pair combinations a typical workshop encounters across a season.

Why twelve sizes

Cup-and-cone hub manufacturers use different cone nut sizes across their lines. Shimano front hubs commonly use 13 mm or 15 mm; rear hubs use 15 mm or 17 mm. Campagnolo hubs commonly use 16 mm or 17 mm. Older Mavic hubs use 14 mm or 16 mm. The size variety means a partial set leaves gaps; the one wheel you can't service is the one the customer brought in.

What's in the set

Twelve cone wrenches, one of each size:

• 13 mm
• 14 mm
• 15 mm
• 16 mm
• 17 mm
• 18 mm
• 19 mm
• 20 mm
• 22 mm
• 23 mm
• 24 mm
• 28 mm

Specs

• Twelve open-end cone wrenches
• Thin-jaw profile for cone-nut clearance
• Chrome-plated finish
• SKU: 1617/2DPCB-US (626602)

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 cone wrench line is the hub-service complement to Unior's bottom-bracket and cassette tools; cup-and-cone hubs are increasingly rare on new bikes (most modern hubs use cartridge bearings), but the bench inventory still calls for them when servicing the older wheels customers bring in.

Pro tip from our mechanics

Most cup-and-cone hub services start with the wrong cone wrench. The cone-nut size is often invisible from the outside until you remove the dust cap or seal; and the size can be different on the drive side and the non-drive side of the same hub. Pull the seal, measure or read the cone size, then reach for the right two wrenches. The five-second size check at the start of the job is the difference between a clean preload set and a stripped cone face.

For the broader picture on tool inventory for a complete workshop, including the cone wrenches alongside the rest of the kit: What bike tools do I need? →.