Just as cyclists optimize performance by being as light but as powerful as possible, the SL Sprint Stem is an ideal balance of the stiffness and lightweight to be responsive without wasting a single watt. The stem weighs in at just 1.8g per newton meter of stiffness. Howd we do that? The SL Sprint was designed using SRAMs Exogram technology, the same used in the ultra light and strong SRAM RED cranks.

The SL Sprint was designed with feedback from top pros to meet the unrelenting demands of Grand Tour sprinters. Zipp also tapped into expertise gained from its pioneering carbon stems and exhaustively researched the marketplace to create the SL Sprint Stem.

The SL Sprint comes with its own stem cap thats designed to be aerodynamically efficient by blending into the stem body. Available in six sizes ranging from 90 to 140mm to meet any riders fit needs. Includes stiff aluminum faceplate and steel Torx T25 bolts for precise torque readings and ease of adjustment. Black with white Zipp logo.

• Weight (100mm) 165g
• Sizes 90, 100, 110, 120, 130, 140
• Material Unidirectional carbon
• Hardware Stainless steel with Torx T25 heads
• Clamp Diameter 31.8mm
• Angle -12
• Steer tube diameter 11/8 in
• Stack height 41.0mm
• Clamp width 50mm
• Clamp torque - max 6Nm

Zipp chooses Torx-head bolts for its stems and aero bars - why? Its simply a better bolt:
Wont 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.
The Torx head is more robust that hex-head bolts and will not easily strip. Torx fasteners also were designed for use with a torque-limiting wrench (torque wrench), which is needed to achieve the precise torque reading for proper installation.

We chose a bolt size  T25  for that was best suited for our 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. Its been used on disc brakes for years and also is in use on chainring bolts, derailleurs and shifters. Whats more, the T25 tool is a common in bike shops or hardware stores and is readily available alone or in multi-tool sets. For your convenience, Zipp includes a T25 wrench with all stems and aero bars.