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Aluminum trumps carbon.

For years, Zipp dabbled exclusively in carbon fiber, not giving a second glance to aluminum as a material. It was only after the release of its Alloy 101 wheel set that it realized that a whole group of people actually like aluminum components when the design and performance dictate that they perform as well or better than carbon. The Service Course Alloy Stem, takes aluminum and gives it a compelling reason to be on your bike.

Zipp forged the Service Course Stem from 7075 aluminum alloy. They use a 3D process whereby the grain structure is aligned within the stem to imbue it with extra strength. As a result the final structure features a thin wall which then results in reduced weight. And for looks, Zipp gave it a sleek streamlined look that doesn't conflict with the sleak lines of today's carbon frames.

The Zipp Service Course Alloy Stem is offered in seven sizes from 70 to 130mm in 10mm increments. Each length is available in two angle options - the ±6° option is ubiquitous these days, but the ±17° models remind us of a bygone era where stems were dead flat and oh-so pro. It has a 31.8mm clamp diameter and is a perfect match for Zipp handlebars. The 1-1/8" steerer clamp has a stack height of 42mm.

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Here's what others have to say...

5 5

Worth every cent. Scoop em up now!!!

  • Familiarity: I've put it through the wringer

At this price you are getting an absolute bargain. And the construction and performance of these are second to none for the price. This is really top quality stuff. Zipp discontinued this model service course design and logos in favor of a newer design/logos so these will be gone shortly. Sad, because these are perfection IMO. Stock up now while it's cheap!!!

Do you stock replacement M5 bolts for this stem? Thank you.

Best Answer Responded on


We don't have those here. I would contact Zipp directly and they can likely send you out some replacements.

4 5

Worthy upgrade.

This is a great stem. Light, Stiff, Torx bolts, and Zipp quality you have come to love. A great upgrade from stock stems, and won't break the bank.

Have a slightly smaller handelbar than...

Have a slightly smaller handelbar than 31.8 is it possible too have the exact size i think is 1 inch , i need a stem 70mm long for my specialized m4 anybody cuold help me i dont want to change handlebars

Responded on

Hey Charles, I know this is late, but that won't work, you would need a 25.4 clamp stem.

5 5


  • Gender: Male
  • Familiarity: I've put it through the wringer

This stem is light and bomber at a stellar price. Can't beat it.