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Reign SX

3919 Original price 4899

Available sizes: XL
In store only


Dial in the frame geometry for your riding style and terrain, then let it rip. This new shapeshifter enduro bike delivers confidence and control on the rowdiest terrain. Its mixed wheel size, 29-inch front and 27.5 rear, blends stability and speed with agility that pops.

Key Performance Factors

Race-bred suspension

The Maestro rear suspension eats up enduro terrain with 165mm of smooth, active rear travel matched with a 190mm travel fork. The trunnion mount rear shock has a longer stroke (65mm over 60mm on the previous generation) while the Advanced Forged Composite upper rocker arm adds stiffness and lowers overall frame weight.

Adjustable enduro geometry

New flip chip feature lets you adjust frame geometry depending on the terrain. You can select a 63.1 or 63.5-degree head angle and corresponding 77.9 or 78.3-degree seat tube angle, resulting in a 25 or 19mm bottom bracket drop (size medium) to fine-tune handling for varying trail conditions and riding style.

Mixed wheel size

A 29-inch front wheel provides speed, stability and front-end control on rough, technical trails. A 27.5-inch rear wheel adds agility and maneuverability to help riders rail corners, pop over features and show off their style.


This gravity-focused enduro machine features a lightweight, stiff and super-strong ALUXX SL frameset paired with our latest Maestro rear suspension. The frameset is optimized for its mixed wheel setup, with a 27.5-inch rear and 29-inch front. A plush suspension system with 165mm in the rear and a 190mm triple crown fork up front gives you the ability to send it on the roughest descents. You can also adjust frame geometry with a flip chip that lets you switch the head tube and seat tube angles, along with bottom bracket drop, to dial in the handling for your riding style and terrain. And a new integrated down tube storage feature provides convenient carrying capacity for on-trail essentials.

Reign SX with interactive tooltips

Techs & Features

ALUXX SL Aluminum Technology
Advanced Forged Composite Technology
Maestro Suspension Technology
Tubeless System
Flip Chip - Maestro 3

Sizing Guide and Geometry

Sizing to be used as a reference only. Please check with a local authorized dealer to determine the correct size.
Available sizes may vary from country to country.

Selection of a button will change the units measurement displayed throughout the entire sizing guide section.
  • M
      171 cm5’7”  to 180 cm5’11”
  • L
      179 cm5’10”  to 188 cm6’2”
  • XL
      187 cm6’2”  to 196 cm6’5”
bike diagram with measurements referenced in table that follows
Selection of a button will change the units measurement displayed throughout the entire sizing guide section.
ASeat Tube Length (mm) (inch)42516.745017.747518.7
BSeat Tube Angle (degrees) 77.9° | 78.3° 77.0° | 77.3° 77.0° | 77.3°
CTop Tube Length (mm) (inch) 5880 | 5870 6210 | 6200 6530 | 6520
DHead Tube Length (mm) (inch)1054.11154.51204.7
EHead Tube Angle (degrees) 63.1° | 63.5° 63.1° | 63.5° 63.1° | 63.5°
FFork Rake (mm) (inch)562.2562.2562.2
GTrail (mm) (inch) 1300 | 1270 1300 | 1270 1300 | 1270
HWheelbase (mm) (inch) 12280 | 12270 12830 | 12820 13160 | 13150
IChain Stay Length (mm) (inch) 4430 | 4420 4430 | 4420 4430 | 4420
JBottom Bracket Drop (mm) (inch) 250 | 190 250 | 190 250 | 190
KStack (mm) (inch) 6350 | 6320 6440 | 6410 6480 | 6450
LReach (mm) (inch) 4520 | 4560 4720 | 4760 5030 | 5070
MStand Over Height (mm) (inch) 7370 | 7420 7500 | 7550 7660 | 7710
OStem Length (mm) (inch)502502502
PCrank Length (mm) (inch)1656.51656.51656.5
QWheel Size F29/R27,5F29/R27,5F29/R27,5
  • Sizes
    M, L, XL
  • Colours
    Purple/Petra Clay
  • 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 downtube storage
  • Fork
    Fox 40 Performance, GRIP damper, 190mm, 20x110, custom tuned for Giant
  • Shock
    Fox DHX2 Performance Elite, 205/65, custom tuned for Giant S:400#, M:400#, L:450#, XL:500#
  • Handlebar
    Giant Contact SL TR35, 800x35mm, 20mm rise
  • Grips
    Giant Tactal Pro Single S:120mm, M:120mm, L:130mm, XL:130mm
  • Stem
    TruVativ Descendant Direct Mount 35, 50mm
  • Seatpost
    Giant Contact, 30.9mm, 400mm
  • Saddle
    Giant Romero
  • Shifters
    Shimano Deore SL-M4100, 1x10
  • Front Derailleur
  • Rear Derailleur
    Shimano Deore RD-M5120
  • Brakes
    SRAM Code R, hydraulic, CenterLine rotors [F]220mm, [R]200mm
  • Brake Levers
    SRAM Code R
  • Cassette
    Shimano Deore M4100, 11x46
  • Chain
    KMC X10
  • Crankset
    Praxis Cadet HD M24, 32t, 165mm, 55mm chainline
  • Bottom Bracket
    Praxis, press fit
  • Rims
    Giant AM, alloy
  • Hubs
    Giant Boost, sealed
  • Spokes
  • Tires
    [F] Maxxis Assegai 29x2.5 WT, 3C MaxxTerra, EXO+, TR [R] Maxxis Minion DHR II 27.5x2.5 WT, 3C MaxxTerra, DD, TR tubeless
  • Extras
    tubeless prepared, 2.5" max tire size, 36t max chainring size, MRP AMG CS chain guide
  • Weight
    The most accurate way to determine any bike’s weight is to have your local dealer weigh it for you. Many brands strive to list the lowest possible weight, but in reality weight can vary based on size, finish, hardware and accessories. All our bikes are designed for best-in-class weight and ride quality.

All prices and specifications are subject to change without notice.

All prices and specifications are subject to change without notice.