Speed Pedal Wrench 8mm

The hex pedal wrench for MTB and traditional clipless

The 8 mm hex socket is the traditional pedal-spindle interface that dominated MTB clipless and road clipless designs for the two decades before 6 mm took over premium road. Shimano SPD MTB pedals, most clipless platforms with a steel spindle, and the broader installed base of pedals on the road today use 8 mm hex. If a pedal does not have 15 mm wrench flats and was made before about 2018, the inboard hex is almost certainly 8 mm.

The Speed Pedal Wrench is built for the install and removal extremes of that interface. The swivel handle locks at 90 degrees when the 35–40 Nm install torque needs every centimetre of lever arm, and locks at 0 degrees when the pedal is threading through its travel and the mechanic wants to spin it fast.

Why an 8 mm hex pedal needs a different wrench than a regular Allen key

A standard 8 mm L-shaped Allen key reaches the hex from behind the crank arm, but it has to clear the frame to swing through. On most bikes the long arm hits the chainstay; the mechanic flips to the short arm and loses two-thirds of the leverage at the install-torque extreme.

The swivel handle removes the geometry problem. The handle rotates to clear the frame, then locks rigid for the high-torque moment. The lock takes the install spec without giving back any of the lever arm a standard wrench gives up at the frame.

Compatibility

Fits any pedal with an 8 mm hex socket at the inboard end of the spindle. This is the volume standard for MTB clipless (most Shimano SPD), traditional road clipless designs, and the broader installed base of hex-engagement pedals. Newer premium road clipless pedals use 6 mm hex; see the Speed Pedal Wrench 6mm variant. Pedals with 15 mm wrench flats are best served by the Pro Pedal Wrench or home Pedal Wrench.

Specs

• Engagement: 8 mm hex bit
• Handle: Swivel handle, 0° / 90° lockable positions
• Material: Premium flex chrome-vanadium steel, drop-forged body, hardened and tempered
• Finish: Chrome plated per ISO 1456:2009
• Standard: Manufactured per ISO 3315
• Grip: Ergonomic two-component handle
• SKU: 1613S-1BI (8 mm variant)

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 8 mm hex bit sees the most cyclic stress on this wrench. Hardened-and-tempered chrome-vanadium drop-forged from the Zreče works gives the bit the wear resistance to hold its profile across thousands of install cycles; a stamped bit at this size rounds out long before a forged one does.

Pro tip from our mechanics

Service rigs and home shops that work on MTB volume need an 8 mm hex pedal wrench within reach. Once the threads are clean and anti-seized, the swivel handle is the difference between a pedal swap that takes two minutes and one that takes ten. Our pedal guide covers the install procedure, the removal sequence, and how to spot a stripped thread before the wrench finds it: How to install and remove bike pedals →