Zipp Service Course Stem – AL6061 – 31.8mm – ±25° – 105mm – Black

The Zipp Service Course stem is a strength-focused road stem designed for riders who need a wider range of fit adjustment without sacrificing stiffness or reliability. Built from AL6061 aluminum, it uses Zipp’s updated faceplate and body geometry to provide a secure clamp and straightforward installation.

The ±25° angle option makes this version especially useful for fit corrections, upright endurance setups, or riders dialing in bar height without changing spacers or handlebars. Compared to low-angle stems, this offers significantly more adjustment range while maintaining a solid front-end feel.

Key Features

• AL6061 aluminum construction for durability and stiffness

• Updated faceplate and body geometry for improved clamping and ease of install

• High-angle ±25° design for expanded fit adjustment

• Smooth, clean exterior lines to match modern road frames

• Approximate weight reference: 130g (100mm)

Compatibility & Use Notes

• Road bike application

• Fork steerer diameter: 1-1/8"

• Handlebar clamp diameter: 31.8mm

• Length: 105mm

• Angle: ±25°

• Stack height: 41mm

• Compatible with standard round 31.8mm handlebars

Service / Ownership Context
High-angle stems place different loads on the steerer and handlebar interface. Even bolt torque and correct orientation are important to avoid slippage or bar damage. Recheck torque after initial rides, especially if the stem is flipped to the high-rise position.

Fit & Use Signals

• Chosen when significant handlebar height or angle adjustment is needed

• Useful for endurance road bikes, comfort-focused builds, or fit corrections

• Works well when spacer limits prevent further bar height changes

• Not intended for MTB or oversized handlebar standards

• Common replacement when improving comfort without changing bars or fork spacers