Zipp Service Course Stem 31.8mm 6°Since the introduction of Zipp's line of Service Course and Service Course SL components, they've had amazing success with pro level athletes in all disciplines. While the successes have reinforced the design decisions, they have also drawn from their feedback. They not only learned how and why athletes make their equipment choices, but how manufacturing methods and materials affect product performance. With new knowledge as well as new engineering
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