Cockpit parts for the Giant Reign 29 2 (2021)

Parts menu — 7 parts

• Zipp Service Course bar tape

  Bar tape

  fits · confidence: verified

  Universal part: zero fit requirements, nothing to be wrong about.

  Universal — no fit requirement

  • Search AmazonSearch results · confirm model and availability.
  • Zipp official siteModel page · confirm variant, availability and delivery.

• Race Face Aeffect R 35 riser handlebar, 780 mm

  Handlebar

  unknown · confidence: single-source

  Why? The facts we compared (1 dimension compared)

  • Stem bar-clamp diameter (fitted stem) (safety-critical): bike 35 mm (single-source) · part 35 mm — match

  Downgraded to "unknown": every fact matches, but a safety-critical one is confirmed by a single source only — we say "fits" on a safety dimension only with two independent sources

  Sources:

  • Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
  • Race Face — Aeffect R 35 Handlebar (tier 1, read 2026-08-21)

  View specifications →

• Thomson Elite X4 stem, 31.8 mm bar / 1-1/8" steerer

  Stem

  unknown — safety-critical · confidence: single-source We can't answer this yet, and this is one where a guess could hurt you.

  Why? The facts we compared (2 dimensions compared)

  • Handlebar clamp diameter (fitted bar) (safety-critical): bike 35 mm (single-source) · part 31.8 mm — mismatch
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

  Sources:

  • Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
  • Thomson — Elite 31.8mm X4 Stems (tier 1, read 2026-08-21)

  View specifications →

• Zipp Service Course SL stem

  Stem

  unknown — safety-critical · confidence: single-source We can't answer this yet, and this is one where a guess could hurt you.

  Why? The facts we compared (2 dimensions compared)

  • Handlebar clamp diameter (fitted bar) (safety-critical): bike 35 mm (single-source) · part 31.8 mm — mismatch
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

  Sources:

  • Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
  • Zipp (SRAM) — Service Course SL Stem — ST-SC-SL-B2 (tier 1, read 2026-08-21)

  View specifications →

• Zipp Service Course stem

  Stem

  unknown — safety-critical · confidence: single-source We can't answer this yet, and this is one where a guess could hurt you.

  Why? The facts we compared (2 dimensions compared)

  • Handlebar clamp diameter (fitted bar) (safety-critical): bike 35 mm (single-source) · part 31.8 mm — mismatch
  • Steerer clamp (stem) (safety-critical): bike nothing on file · part 1-1/8" (28.6 mm) — not on file

  Sources:

  • Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
  • Zipp (SRAM) — Service Course Stem — ST-SC-B2 (tier 1, read 2026-08-21)

  View specifications →

• Salsa Cowchipper flared drop handlebar

  Handlebar

  does not fit · confidence: single-source

  Why? The facts we compared (1 dimension compared)

  • Stem bar-clamp diameter (fitted stem) (safety-critical): bike 35 mm (single-source) · part 31.8 mm — mismatch

  Sources:

  • Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
  • Salsa Cycles — Cowchipper handlebar (tier 1, read 2026-08-21)

  View specifications →

• Zipp Service Course SL-70 drop handlebar

  Handlebar

  does not fit · confidence: single-source

  Why? The facts we compared (1 dimension compared)

  • Stem bar-clamp diameter (fitted stem) (safety-critical): bike 35 mm (single-source) · part 31.8 mm — mismatch

  Sources:

  • Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
  • Zipp (SRAM) — Service Course SL-70 Handlebar — HB-DBSC-SL70-B2 (tier 1, read 2026-08-21)

  View specifications →