MountainPartial spec

2021 Giant Reign SX 29

Lists today at $4,550 (2026-09)

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What a used one is worth

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New

$2,542

$1,642 to $3,063

Like new

$2,415

$1,560 to $2,910

Excellent

$2,288

$1,478 to $2,757

Good

$1,907

$1,231 to $2,297

Fair

$1,398

$903 to $1,685

For parts

$763

$493 to $919

From the launch price, aged to 2026 and adjusted for condition. Guidance from our catalog, not an appraisal.

Overview

Brand: Giant
Model family: Reign
Model year: 2021
Category: Mountain · enduro
Frame material: aluminum
Sizes: S, M, L, XL
Wheel size: 29
Current list price: $4,550 (as of 2026-09)

Drivetrain

Speeds: 12
Groupset: SRAM NX Eagle
Electronic: false

Build

Fork: Fox 38 Performance Elite, GRIP2, 170mm, Boost 110x15 Kabolt, 44mm offset, custom tuned for Giant
Stem: Giant Contact SL 35
Tires: [F] Maxxis Assegai, tubeless, 29x2.5 WT, MaxxTerra, EXO+, TR [R] Maxxis Minion DHR II, tubeless, 29x2.4 WT, MaxxTerra , EXO+, TR
Brakes: Shimano SLX hydraulic 4-piston, 203mm
Saddle: Giant Romero
Wheels: Giant AM 29 wheelset, alloy, 30mm inner
Cassette: SRAM NX Eagle, 12-speed, 11x50
Crankset: Truvativ Descendent 6k Eagle DUB, 32t, MRP alloy guide
Seatpost: Giant Contact Switch dropper post with remote, 30.9
Shifters: SRAM NX Eagle
Handlebar: Giant Contact SL Trail, 35
Rear shock: Fox DHX2 Performance Elite, 205/60, custom tuned for Giant
Travel rear mm: 146
Rear derailleur: SRAM NX Eagle
Travel front mm: 170

Geometry

L: Reach mm: 488; Stack mm: 631; Chainstay mm: 439; Wheelbase mm: 1262; Head angle deg: 64.6; Seat angle deg: 76.4
M: Reach mm: 451; Stack mm: 622; Chainstay mm: 439; Wheelbase mm: 1220; Head angle deg: 64.6; Seat angle deg: 76.4
S: Reach mm: 423; Stack mm: 622; Chainstay mm: 439; Wheelbase mm: 1191; Head angle deg: 64.6; Seat angle deg: 76.4
XL: Reach mm: 511; Stack mm: 640; Chainstay mm: 439; Wheelbase mm: 1289; Head angle deg: 64.6; Seat angle deg: 76.4

Last Giant US MSRP shown on the archived model-year page, observed 2026-09-21; not the launch MSRP (Giant changed this model year's price after launch). Price labels fixed 2026-09-27: moved $4,550 from msrp_usd to list_price_usd (as of 2026-09) and set msrp_usd to null per the Giant model-year price audit.

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