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Zipp Service Course SL stem

Zipp stem. Needs from your bike: Handlebar clamp diameter (fitted bar) and Steerer clamp (stem). Provides: Stem bar-clamp diameter (fitted stem).

Find this part

Choose the right variant and check the fit for your bike.

The Zipp Service Course SL stem is a stem (component). It requires 2 things of a bike — Handlebar clamp diameter (fitted bar) and Steerer clamp (stem) — read from Zipp (SRAM). It provides Stem bar-clamp diameter (fitted stem) to the parts that mount on it. On every bike page its verdict is computed from those requirements against the bike's cited facts: when a fact is missing the answer is "unknown", never a guess.

Requires — Handlebar clamp diameter (fitted bar)31.8 mm
Requires — Steerer clamp (stem)1-1/8" (28.6 mm)
Provides — Stem bar-clamp diameter (fitted stem)31.8 mm

Mounting requirements to check: Handlebar clamp diameter (fitted bar) and Steerer clamp (stem). Compatibility requires bike measurements confirmed by two independent sources. Otherwise, the verdict shows "Fit checks required" with the specific checks to complete.

Does this part fit my bike?
Find your bike under "Fits these bikes" below, or open your bike's "Cockpit" region page. The verdict there is computed from this part's requirements against the bike's cited facts — with its confidence and sources.
What does "does not fit" mean here?
That a fact on file for the bike contradicts a requirement of this part — a confident no, with both values shown.

Standards

  • 31.8 mm
  • 1-1/8" (28.6 mm)

Needs from your bike: Handlebar clamp diameter (fitted bar): 31.8 mm · Steerer clamp (stem): 1-1/8" (28.6 mm)

Provides: Stem bar-clamp diameter (fitted stem): 31.8 mm

Stem

Fits these bikes

Canyon Grail CF SL 7Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Defy Advanced 2 (2025)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Escape 3 (2024)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Fathom 29 2 (2022)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Glory Advanced (2025)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Propel Advanced 2 (2027)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Reign 29 2 (2021)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Revolt Advanced 2 (2025)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Roam 2 Disc (2021)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Talon 2 (2025)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Talon E+ (2026)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant TCX Advanced Pro 2 (2023)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant Trance X 29 2 (2022)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Giant XTC Jr 24 (2015)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Kona SutraFit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Liv Flourish 2 (2017)Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

State Bicycle Co. Core-Line WulfFit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Surly Disc Trucker 700c (2nd generation (2020 platform))Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

Tern Quick Haul D8 Gen 1Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

woom GO 4Fit checks required · confidence: single-source Compatibility is not confirmed. Verify the listed mounting requirements before buying or installing this part.
  • Handlebar clamp diameter (fitted bar) : 31.8 mmCheck your installed setup or its technical sheet.
  • Steerer clamp (stem) : 1-1/8" (28.6 mm)Check your installed setup or its technical sheet.
Why? The facts we compared (2 dimensions compared)
  • Handlebar clamp diameter (fitted bar) (safety-critical): bike nothing on file · part 31.8 mm — not on file
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

Sources:

See all 21 bikes

Sources

The spec sheets we read. Every fact above cites one of them.

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