Drivetrain parts for the Giant Reign 29 2 (2021)

We have not verified this bike yet

8 of the 16 measurements are on file; 0 confirmed by two independent sources. Without enough evidence, fit stays “unknown.”

Only universal parts (lube, tools, bar tape) are offered for this bike until verification.

Giant Reign 29 2 (2021)

The drivetrain of the Giant Reign 29 2 (2021): 5 slots — Bottom bracket, Chain guide, Front derailleur, Chain and Chain lube. 1 fit fact on file for this region. The parts menu below lists every catalogued part that belongs here with its computed verdict — fits, fits with adapter, does not fit or unknown — and why.

"Drivetrain" here is the residual region: chain, front derailleur, bottom bracket, chain guide and chain lube. The cassette, rear derailleur and crankset each have their own region.

Chain standard	12-speed HG+ / Eagle (5.25 mm) (single-source)

What does "unknown" mean on this page?: That we do not have, on file, the bike measurement this part needs. It is not a quiet "yes": until the measurement is on file, we do not sell the part for this bike.

Slots in this region

Bottom bracket
Chain guide
Front derailleur
Chain
Chain lube

KMC e12 e-bike chain, 12-speed
Chain
fits · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Chain standard: bike 12-speed HG+ / Eagle (5.25 mm) (single-source) · part 12-speed HG+ / Eagle (5.25 mm) — match
Sources:
- Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
- KMC Chain — e12 — 12-speed e-bike chain (tier 1, read 2026-08-21)
View specifications
KMC X12 chain, 12-speed (Eagle / Campagnolo)
Chain
fits · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Chain standard: bike 12-speed HG+ / Eagle (5.25 mm) (single-source) · part 12-speed HG+ / Eagle (5.25 mm) — match
Sources:
- Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
- KMC Chain — X12 — 12-speed bicycle chain (tier 1, read 2026-08-21)
View specifications
Muc-Off C3 Dry Weather Ceramic chain lube, 120 ml
Chain lube
fits · confidence: verified
Universal part: zero fit requirements, nothing to be wrong about.
Universal — no fit requirement
- Search AmazonSearch results · confirm model and availability.
- Muc-Off official siteModel page · confirm variant, availability and delivery.
SRAM GX Eagle chain, 12-speed
Chain
fits · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Chain standard: bike 12-speed HG+ / Eagle (5.25 mm) (single-source) · part 12-speed HG+ / Eagle (5.25 mm) — match
Sources:
- Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
- SRAM — GX Eagle Chain — CN-EAGL-GX-A1 (tier 1, read 2026-08-21)
View specifications
OneUp Components Chain Guide ISCG05 V2
Chain guide
unknown · confidence: single-source
Why? The facts we compared (1 dimension compared)
- ISCG chain-guide tabs: bike nothing on file · part ISCG 05 — not on file
Sources:
- OneUp Components — Chain Guide - ISCG05 - V2 (tier 1, read 2026-08-21)
View specifications
SRAM DUB BB30 bottom bracket
Bottom bracket
unknown · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Bottom bracket shell: bike nothing on file · part BB30 (42 mm bore, 68 mm) or BB30, 73 mm or BBright (Cervélo, 46 mm bore, 79 mm) — not on file
Sources:
- SRAM — DUB BB30 Bottom Bracket — BB-DUB-BB30-A1 (tier 1, read 2026-08-21)
View specifications
SRAM DUB BSA bottom bracket, 68/73 mm
Bottom bracket
unknown · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Bottom bracket shell: bike nothing on file · part BSA / English threaded, 68 mm or BSA / English threaded, 73 mm — not on file
Sources:
- SRAM — DUB BSA Bottom Bracket — BB-DUB-BSA-A1 (tier 1, read 2026-08-21)
View specifications
SRAM DUB BSA bottom bracket, 83 mm (DH)
Bottom bracket
unknown · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Bottom bracket shell: bike nothing on file · part BSA / English threaded, 83 mm — not on file
Sources:
- SRAM — DUB BSA Bottom Bracket — BB-DUB-BSA-A1 (tier 1, read 2026-08-21)
View specifications
SRAM DUB PressFit bottom bracket, PF86.5/89.5/92
Bottom bracket
unknown · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Bottom bracket shell: bike nothing on file · part Press-fit BB86 (41 mm bore, 86.5 mm) or Press-fit BB92 (41 mm bore, 91.5 mm) — not on file
Sources:
- SRAM — DUB PressFit Bottom Bracket — BB-DUB-PF-A1 (tier 1, read 2026-08-21)
View specifications
SRAM DUB PressFit30 bottom bracket
Bottom bracket
unknown · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Bottom bracket shell: bike nothing on file · part Press-fit PF30 (46 mm bore, 68 mm) or Press-fit PF30, 73 mm or BB386EVO (46 mm bore, 86.5 mm) or BBright (Cervélo, 46 mm bore, 79 mm) — not on file
Sources:
- SRAM — DUB PressFit30 Bottom Bracket — BB-DUB-PF30-A1 (tier 1, read 2026-08-21)
View specifications
Wheels Manufacturing Threaded Road ABEC-3 BB for 24 mm cranks (BSA 68)
Bottom bracket
unknown · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Bottom bracket shell: bike nothing on file · part BSA / English threaded, 68 mm — not on file
Sources:
- Wheels Manufacturing — Threaded Road ABEC-3 BB for 24mm Cranks (Shimano) — BB-ROAD-13 (tier 1, read 2026-08-21)
View specifications
KMC X10 chain, 10-speed
Chain
does not fit · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Chain standard: bike 12-speed HG+ / Eagle (5.25 mm) (single-source) · part 10-speed (6.0 mm) — mismatch
Sources:
- Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
- KMC Chain — X10 — 10-speed bicycle chain (tier 1, read 2026-08-21)
View specifications
KMC X11 chain, 11-speed
Chain
does not fit · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Chain standard: bike 12-speed HG+ / Eagle (5.25 mm) (single-source) · part 11-speed (5.5 mm) — mismatch
Sources:
- Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
- KMC Chain — X11 — 11-speed bicycle chain (tier 1, read 2026-08-21)
View specifications
KMC X9 chain, 9-speed
Chain
does not fit · confidence: single-source
Why? The facts we compared (1 dimension compared)
- Chain standard: bike 12-speed HG+ / Eagle (5.25 mm) (single-source) · part 9-speed (6.6 mm) — mismatch
Sources:
- Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)
- KMC Chain — X9 — 9-speed bicycle chain (tier 1, read 2026-08-21)
View specifications

Sources

Giant Bicycles — Reign 29 2 (2021) — specifications (tier 1, read 2026-08-21)

Slots in this region

Parts menu — 14 parts

Sources