Overview
The 2025 Giant Reign SX is the gravity-oriented big brother in Giant’s Reign family, packing 165mm of Maestro rear travel with a massive 190mm RockShox Boxxer Charger 3 RC fork. Built on an ALUXX SL aluminum frame with a fixed mullet wheel setup (29″ front / 27.5″ rear), the Reign SX bridges the gap between enduro racing and bike park riding. At $4,000, it’s one of the most affordable ways to get a serious long-travel enduro bike.
New to bike geometry? Our complete guide to mountain bike geometry explains every measurement and what it means for your riding. You can also learn how to read a geometry chart to compare this bike against other models.
Available in three sizes (M, L, XL — no Small), the Reign SX runs a budget-friendly but capable spec: microSHIFT 1×10 drivetrain, TRP EVO DH-R brakes with 220/200mm rotors, and a RockShox Vivid Base shock with lockout. A two-position flip chip adjusts the head angle between 63.1° and 63.5°. The 56mm fork offset (vs 44mm on the Reign Advanced) is spec’d for the longer-travel Boxxer fork and contributes to composed, stable handling at speed.
Geometry Diagram
Geometry Table
| Measurement | M | L | XL |
|---|---|---|---|
| Seat Tube Length | 425mm | 450mm | 475mm |
| Seat Tube Angle (Low/High) | 77.9° / 78.3° | 77.0° / 77.3° | 77.0° / 77.3° |
| Top Tube Length (Low) | 588mm | 621mm | 653mm |
| Head Tube Length | 105mm | 115mm | 120mm |
| Head Tube Angle (Low/High) | 63.1° / 63.5° | 63.1° / 63.5° | 63.1° / 63.5° |
| Fork Rake | 56mm | 56mm | 56mm |
| Wheelbase (Low) | 1228mm | 1283mm | 1316mm |
| Chainstay Length (Low) | 443mm | 443mm | 443mm |
| BB Drop (Low/High) | 25mm / 19mm | 25mm / 19mm | 25mm / 19mm |
| Stack (Low) | 635mm | 644mm | 648mm |
| Reach (Low) | 452mm | 472mm | 503mm |
| Standover Height (Low) | 737mm | 750mm | 766mm |
| Wheel Size | 29″ F / 27.5″ R | 29″ F / 27.5″ R | 29″ F / 27.5″ R |
Geometry Analysis
The Reign SX’s geometry is aggressive but not as radical as the Boxxer fork might suggest. The 63.1° head angle (low position) is slightly steeper than the Reign Advanced’s 62.7° — likely because the longer-offset 56mm Boxxer fork increases trail and stability enough that a slightly steeper angle balances handling. The 77.0° seat tube angle (77.9° on M) is steep for climbing efficiency. Reach numbers are generous: 472mm on Large provides a stable platform for high-speed descending. The 443mm chainstays are just 1mm longer than the Reign Advanced’s, keeping the rear end responsive despite the longer fork. BB drop of 25mm in low position is moderate — higher than the Reign Advanced’s 29mm, giving extra pedal clearance on rough terrain. The longer 1283mm wheelbase (L) provides DH-level stability at speed.
Ride Characteristics
The Reign SX is a gravity sled that can still pedal home. The 190mm Boxxer fork and 165mm rear travel eat up everything you point the bike at — bike park jumps, rock gardens, steep chutes, drops. The aluminum frame is durable and forgiving of the inevitable impacts that come with this style of riding. The RockShox Vivid shock with lockout means you can firm up the rear end for climbs, though no one is buying a Reign SX for its climbing prowess. Descending is absolute confidence — the long wheelbase, slack geometry, and massive travel let you carry speed through rough terrain that would overwhelm shorter-travel bikes. The mullet setup keeps the rear end agile for pumping and cornering. The microSHIFT drivetrain is an honest budget pick — it shifts cleanly and reliably. At $4,000, the Reign SX delivers an incredible amount of capability for riders who prioritize descending.
Key Specs
Frame: ALUXX SL aluminum, Maestro 4-pivot, 165mm travel. Wheel Size: 29″ front / 27.5″ rear (mullet). Fork: RockShox Boxxer Charger 3 RC, 190mm. Shock: RockShox Vivid Base with lockout, 205/65mm. Sizes: M, L, XL. Drivetrain: microSHIFT 1×10, 11-48t, 32t crank. Brakes: TRP EVO DH-R hydraulic, 220mm (F) / 200mm (R). Price: $4,000.
What’s New vs Previous Generation
The 2025 Reign SX brings the Reign platform to a more accessible price point with an aluminum frame and value-oriented spec. The ALUXX SL aluminum frame shares the same Maestro 4-pivot suspension kinematics as the carbon Reign Advanced. Key features include the two-position flip chip for geometry adjustment, RockShox Boxxer Charger 3 RC fork (a serious DH-rated fork), and TRP brakes. The microSHIFT drivetrain keeps the price down while maintaining reliable shifting performance.
Who Should Consider This Bike
The Reign SX is perfect for gravity-focused riders on a budget. If you spend most of your time in bike parks, on shuttle runs, or riding the steepest trails in your area, and you want maximum descending capability without spending over $4,000, the Reign SX delivers. It’s also an excellent choice as a dedicated park bike for riders who have a separate trail bike. Riders wanting carbon frame weight savings and more refined spec should look at the Reign Advanced. Those wanting full DH capability should consider the Glory Advanced.
Comparable Models
The Reign SX competes with the Commencal Meta AM, YT Capra, Canyon Torque AL, Nukeproof Giga, and Norco Shore. At $4,000, the Reign SX is competitively priced for an aluminum long-travel enduro bike with a Boxxer fork. The 190mm fork travel exceeds most enduro competitors, putting it in a unique space between traditional enduro and DH bikes. The Commencal Meta AM is the most direct competitor with similar aggressive geometry and aluminum frame.
Related Geometry
More Giant geometry: 2023 Giant Anthem Geometry, 2023 Giant Glory Geometry, 2023 Giant Reign E+ Geometry, 2023 Giant Reign Geometry, 2023 Giant Reign SX Geometry.
Compare enduro bikes: 2023 Norco Range Geometry, 2023 Norco Shore Geometry, 2023 Trek Slash Geometry.
Frequently Asked Questions
What is the travel on the 2025 Giant Reign SX?
The Reign SX has 165mm of Maestro rear suspension paired with a 190mm RockShox Boxxer Charger 3 RC fork — significantly more travel than most enduro bikes.
What sizes does the Giant Reign SX come in?
The 2025 Reign SX is available in three sizes: M, L, and XL. There is no Small size offered.
Is the Giant Reign SX good for bike parks?
Yes. With 190mm of fork travel, 165mm rear, and aggressive geometry, the Reign SX is excellent for bike park riding. The durable aluminum frame and DH-rated Boxxer fork can handle jumps, drops, and rough terrain.
What frame material is the Giant Reign SX?
The Reign SX uses Giant’s ALUXX SL aluminum frame, which is lighter and stiffer than standard aluminum. The Reign Advanced uses a carbon composite frame.
How much does the Giant Reign SX cost?
The 2025 Giant Reign SX retails for $4,000 USD — one of the most affordable long-travel enduro bikes with a premium DH fork.