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Service Course SL Stem
Zipp Service Course racers Service Course

The ultimate in performance and technology

Your stem has to resist flexing during sprints and accelerations, clamp securely to the fork and handlebar, and support your weight over significant impacts. It’s a difficult job, but the Service Course® SL stem is still able to combine strength, stiffness and reliability at a weight of only 120 grams (100 mm).

The Service Course SL has high-strength, 3D-forged construction, 7075 series aluminum and titanium bolts to deliver an exceptional strength-to-weight ratio while allowing for smooth lines to complement the aesthetics of modern frames. 

We make our Service Course SL stems in eight lengths (70 mm to 140 mm in 10 mm increments in 6°) and (70 mm to 130 mm in 10 mm increments in 17°) to meet any rider’s fitting needs.

We replaced the stainless steel bolts with titanium ones and use TORX® heads on all bolts for precision torque readings and ease of adjustment. (See more information below.)

Every piece in the Service Course SL line is available in the standard gloss black with white logos, as well as a new Beyond Black color scheme with laser-etched black logos for a stealthy look.

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.

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 – M5 – 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. 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. For your convenience, Zipp includes a T25 wrench with all stems and aero bars.


$109 / €98

Weight (100mm) 120g
Sizes 70,80,90,100,110,120,130, 140
Clamp Diameter 31.8mm
Angle ±6°/ ±17°
Steer tube diameter 11/8in
Stack height 42mm
Clamp width 40mm
Clamp torque - max 4Nm
Service Course SL highlighted  January 2012 [pdf]

Spanish-language Triathlon magazine featured Zipp®'s Service Course® SL line of bars, stems and seatposts. The item describes Service Course SL as high quality compoments at affordable prices.

Service Course SL components featured  January 2012 [pdf]

Spain's Ciclismo a Fondo magazine on a page of product features highlights Zipp®'s Service Course® SL bars, stems and seatposts. The item describes Service Course SL as combining an elegant design, light weight and excellent rigidity.

Pezcyclingnews Father's Day Gift Guide  June 2011

Service Course SL featured on

Bike Radar 05/10/2011  May 2011

Bike Radar review