Giant Reign SX Mountain Bike 2026 - Enduro Full Suspension MTB
The Reign SX is a gravity-focused enduro bike designed for hard riding on steep, rough terrain. With long-travel suspension, adjustable geometry and a mullet wheel setup, it delivers control and confidence when trails get fast and demanding.
Key Features:
- Frame: ALUXX SL aluminium frame with enduro geometry, flip chip and 165mm Maestro travel
- Fork: RockShox BoXXer fork with 190mm travel and Charger 3 RC damper
- Rear Shock: RockShox Vivid Base rear shock with 165mm of rear wheel travel
- Drivetrain: microSHIFT Advent X 1x10 drivetrain with wide-range cassette
- Brakes: TRP EVO DH-R hydraulic disc brakes with 220/200mm rotors
- Wheels: Mullet setup with 29” front and 27.5” rear Maxxis Assegai tyres
- Standout: Adjustable geometry and wheel size via Flip Chip Maestro 3 system
- Finance: Available with 0% APR finance
The Giant Reign SX is built for riders who prioritise descending performance and control on the roughest trails. The ALUXX SL aluminium frame uses Giant’s high-strength alloy and advanced welding techniques to deliver durability and stiffness where it matters, without unnecessary weight. Integrated downtube storage adds practicality for tools or spares on longer days out.
Maestro suspension provides 165mm of active rear travel, designed to stay sensitive under braking and stable when pushing hard through rough sections. The trunnion-mounted RockShox Vivid Base shock offers a longer stroke than previous versions, improving small-bump performance and consistency on repeated hits.
Up front, the RockShox BoXXer fork delivers 190mm of controlled travel, giving the Reign SX a confident front end for steep chutes, drops and high-speed impacts. The long-travel setup is balanced by a mixed wheel size configuration, with a 29” front wheel for rollover and stability, and a 27.5” rear wheel for quicker direction changes and easier movement through tight sections.
Flip Chip Maestro 3 adjustment lets you fine-tune the bike’s geometry to suit terrain and riding style. Riders can switch between settings to alter head angle, seat angle and bottom bracket height, helping adapt the bike for bike park laps, steep enduro stages or rough natural trails.
The microSHIFT Advent X drivetrain keeps things simple and robust, offering a wide 11–48T gear range that suits steep climbs without adding complexity. TRP EVO DH-R brakes provide strong, consistent braking with large rotors for control on long, sustained descents.
Finished with wide Giant TRA 2 rims and Maxxis Assegai tyres front and rear, the Reign SX is set up for grip, support and reliability. It’s a purpose-built enduro machine for riders who want confidence and composure when the trail points straight down.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | ALUXX SL-grade aluminum front and rear triangles, 165mm Maestro suspension, flip chip, 12x148mm thru-axle, 27.5-inch rear wheel compatible, flip chip - Maestro 3, integrated down tube storage |
| Fork | RockShox BoXXer, Charger 3 RC damper, 190mm, 20x110, custom tuned for Giant |
| Rear Shock | RockShox Vivid Base, lockout, 205/65 |
| Stem | TruVativ Descendant Direct Mount 35, 50mm |
| Bars | Giant Contact SL TR35, 800x35mm, 20mm rise |
| Front Brake | TRP EVO DH-R, hydraulic, TRP rotors [F]220mm, [R]200mm |
| Rear Brake | TRP EVO DH-R, hydraulic, TRP rotors [F]220mm, [R]200mm |
| Brake Lever | TRP EVO DH-R |
| Rear Mech | microSHIFT Advent X |
| Shifters | microSHIFT Trail Trigger Pro, 1x10 |
| Speed | 10 |
| Rims | Giant TRA 2 wheelset, 6061 alloy, hookless, 30mm inner width, 40mm outer width, 21mm height, Wide Guard Technology |
| Front Hub | [F] Giant MTB alloy, six-bolt, [R] Giant MTB alloy, 72 POE (Points of Engagement), six-bolt, HG driver body |
| Rear Hub | [F] Giant MTB alloy, six-bolt, [R] Giant MTB alloy, 72 POE (Points of Engagement), six-bolt, HG driver body |
| Spokes | Sapim, 28, J-bend |
| Front Tyre | [F] Maxxis Assegai 29x2.5 WT, 3C MaxxTerra, EXO+, TR [R] Maxxis Assegai 27.5x2.5 WT, 3C MaxxGrip, DD, TR tubeless |
| Rear Tyre | [F] Maxxis Assegai 29x2.5 WT, 3C MaxxTerra, EXO+, TR [R] Maxxis Assegai 27.5x2.5 WT, 3C MaxxGrip, DD, TR tubeless |
| Seat Post | Giant Contact, 30.9mm, 400mm |
| Saddle | Giant Romero |
| Chainset | Praxis Cadet HD M24, 32t, 165mm, 55mm chainline |
| Bottom Bracket | Praxis, press fit |
| Chain | KMC X-10 |
| Cassette | microSHIFT Advent X, 11-48 |
Mountain Bike Size Chart
|
Height
|
Bike Size
|
Mountain Bike Size
|
|
4’8” – 5’1”
143 – 155 cm
|
XXS
|
13” (33 cm)
|
|
5’1” – 5’4”
155 – 163 cm
|
XS
|
15” (38 cm)
|
|
5’4” – 5’7”
163 – 170 cm
|
S
|
16” (41 cm)
|
|
5’7” – 5’10”
170 – 178 cm
|
M
|
18” (46cm)
|
|
5’10” – 6’0”
178 – 183 cm
|
L
|
19” (48cm)
|
|
6’0” – 6’3”
183 – 191 cm
|
XL
|
20” (51 cm)
|
|
6’3” – 6’5”
191 – 196 cm
|
XXL
|
21” (53 cm)
|
|
6’5” – 6’9”
196 – 205 cm
|
XXXL
|
22” (56 cm)
|
* Mountain bikes are sized differently to road bikes. Typically, they are sized in inches as the first MTBs were produced in the USA. European brands like Lapierre and Haibike like to use centimetres for all their bikes. The measurements of their mountain bikes doesn’t match their road bikes but are like a simple conversion from the inches measurement. This is why we have included cm measurements in brackets for the Mountain bike column.
Read our bike size guide for more information on sizing.
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Giant Reign SX Mountain Bike 2026 - Enduro Full Suspension MTB
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