Zipp Service Course stem

The Service Course stem delivers all you look for in a stem: strength, stiffness, reliability, a precise fit and distinctive look

The Service Course stem offers a faceplate and body design for greater stiffness and easier installation. It’s high performance and high value. The Service Course Stem’s shape and 3D-forged construction results in an improved stiffness-to-weight-ratio. The stem design, along with distinctive graphics, also complement the aesthetics of modern frames. Made from 6061 aluminum, the stem resists flexing during sprints and accelerations.

Features

• Faceplate and body geometry designed for greater stiffness and easier installation.
• Resists flexing during sprints and accelerations.
• 3D-forged construction for an improved stiffness-to-weight-ratio.
• Clean new graphics which will become a complement for the aesthetics of modern frames.
• Handlebar clamp diameter: 31.8mm
• Steerer clamp diameter: 1"1/8.
• Material: Al-6061.
• Stem angle/rise: 84º/6°.
• Real weight: 164 g (110mm).

Technology

Torx Bolts
Zipp chooses Torx®-head bolts for its stems and aero bars - why?
It’s simply a better bolt:

• Won’t easily strip.
• Provide more accurate torque readers.
• Are durable.

It comes down to the way the tool head interacts with the bolt. Common hex tools tend to strip the bolt head if the bolt is over torqued. This is especially true with lightweight bolts. Zipp wanted to be able to use a lightweight bolt with reliable performance. Bolts on stems and aero bars are critical to safety – having a reliable bolt is crucial.

Zipp had choosen a bolt size – T25 – for that was best suited for the stems. The standard Torx tool head for an M5 bolt is a T25, although sometimes a T20 or T27 is used. The T25 is becoming a go-to bolt in the bicycle industry. It’s been used on disc brakes for years and also is in use on chainring bolts, derailleurs and shifters. What’s more, the T25 tool is a common in bike shops or hardware stores and is readily available alone or in multi-tool sets.

Find out more on the packaging of this item.