The eighth-generation Giant Reign SX takes the brand’s proven enduro platform and pushes it firmly into freeride and bike park territory. Introduced for the 2023 model year, this aluminum chassis is built around a mixed-wheel setup and a dual-crown fork, signaling a clear departure from the all-mountain versatility of the standard Reign. Giant pairs a 190mm front end with 165mm of rear-wheel travel, driven by the dual-link Maestro suspension system.
Beyond the bump in travel and gravity-focused stance, this generation introduces practical updates to the alloy frame, including a tool-free integrated downtube storage compartment. A two-position flip chip at the upper rocker link allows riders to tune the geometry for different tracks. The Reign SX is designed for riders who prioritize downhill composure and uplift-assisted laps over pedaling efficiency, offering a heavy-duty platform that bridges the gap between long-travel enduro rigs and dedicated downhill race bikes.
| Stack | 635mm |
| Reach | 452mm |
| Top tube | 588mm |
| Headtube length | 105mm |
| Standover height | 737mm |
| Seat tube length | 425mm |
The Reign SX geometry blends downhill stability with enduro-derived seating proportions. A two-position flip chip alters the head tube angle between a slack 63.1 degrees and a slightly steeper 63.5 degrees, while simultaneously adjusting the bottom bracket drop. This allows riders to prioritize either maximum high-speed stability or a bit more ground clearance and agility.
When standing on the pedals, the reach provides a spacious, centralized riding position that keeps the rider's weight evenly distributed between the wheels. This neutral stance helps maintain front-wheel traction without requiring excessive body English. However, the steep seat tube angle—hovering around 77 to 78 degrees depending on the size and flip-chip setting—creates a compact cockpit when seated.
The mixed-wheel setup plays a crucial role in the bike's handling dynamics. The smaller rear wheel allows for shorter chainstays, which helps the bike corner sharply and makes it easier to lean into turns compared to a full 29-inch downhill bike.
Frameset
Frame
ALUXX SL-grade aluminum front and rear triangles, 165mm Maestro suspension, flip chip (Maestro 3), 12x148mm thru-axle, 27.5-inch rear wheel compatible, 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
Groupset
Shift levers
microSHIFT Trail Trigger Pro, 1x10
Rear derailleur
microSHIFT Advent X
Cassette
microSHIFT Advent X, 10-speed, 11-48T
Chain
KMC X-10
Crankset
Praxis Cadet HD M24, 32T, 165mm, 55mm chainline
Bottom bracket
Praxis, press fit
Front brake
TRP EVO DH-R, hydraulic
Rear brake
TRP EVO DH-R, hydraulic
Front rotor
220mm
Rear rotor
200mm
Wheelset
Front wheel
Giant TRA 2 wheelset, 6061 alloy, hookless, 30mm internal width, 40mm external width, 21mm height, Wide Guard Technology
Rear wheel
Giant TRA 2 wheelset, 6061 alloy, hookless, 30mm internal width, 40mm external width, 21mm height, Wide Guard Technology
Front tire
Maxxis Assegai, 29x2.5 WT, 3C MaxxTerra, EXO+, TR
Rear tire
Maxxis Assegai, 27.5x2.5 WT, 3C MaxxGrip, DD, TR
Cockpit
Stem
TruVativ Descendant Direct Mount 35, 50mm
Handlebars
Giant Contact SL TR35, 800mm width, 35mm clamp, 20mm rise
Saddle
Giant Romero
Seatpost
Giant Contact, 30.9mm, 400mm
Grips
Giant Tactal Pro Single
Giant offers the Reign SX in a single, gravity-focused build that prioritizes suspension performance and durability over climbing utility. The current specification features a 190mm RockShox BoXXer fork paired with a RockShox Vivid Base rear shock, providing a highly capable damping package for severe impacts and sustained descents.
The component selection clearly reflects the bike's intended use in the park rather than on long trail rides. It relies on a 10-speed microSHIFT Advent X drivetrain with an 11-48T cassette, offering a narrower gear range than typical modern enduro bikes. Braking is handled by heavy-duty TRP EVO DH-R hydraulic brakes paired with massive rotors to manage the bike's weight and speed.
Rolling stock consists of Giant's alloy TRA 2 wheelset wrapped in aggressive Maxxis Assegai tires. Notably, the build omits a dropper post in favor of a fixed rigid seatpost, reinforcing that this model is meant for shuttle runs and chairlifts. While the frame is fully routed for a dropper, riders looking to pedal to the top of their descents will need to add one aftermarket.
(2025)
Price TBD
Critics consistently view the Reign SX as a highly capable park bike that excels on steep, rough terrain. Testers found that the Maestro suspension isolates the rider from harsh impacts while maintaining traction, creating a "bump-hungry gravity sled" (BikeRadar) that remains composed at speed. A key highlight is the suspension's behavior under heavy braking, where the rear end remains active and "free to move" (BikeRadar) rather than stiffening up and skipping over braking bumps.
Handling is heavily influenced by the mixed-wheel configuration, which helps the bike initiate turns easily and prevents it from feeling overly sluggish in tight sections. At high speeds, the chassis remains "pleasantly balanced" (Bike-test), offering a ride character that is easier to manage than a full-blown downhill race bike.
The primary criticisms center on the bike's limited versatility outside the bike park. Because the frame retains its enduro-derived steep seat tube, testers noted a "particularly short-feeling front end when seated" (BikeRadar). Combined with the lack of a dropper post and a narrow-range drivetrain, reviewers agreed the bike is a chore to pedal to the trailhead, functioning best when shuttled or ridden on chairlift-accessed terrain.
