Giant Reign E+ 3 Mountain E-Bike

The best descending E-MTB ever. Everything about the new Reign E+ Advanced—from its ultra plush suspension and strong, stiff composite frame to its new E+ System motor and electronics—has been designed for one purpose: to make it the best descending E-MTB ever. From ripping laps at the bike park to big days conquering high alpine peaks, it’s everything you need to push your limits and have more fun on technical off-road terrain.

Key Performance Factors

Dominant on Descents
A the heart of this brawny trail machine is a Maestro rear suspension system with smooth, active performance and a bottomless feel. Using every bit of its 170mm of travel, and paired with a plush 180mm fork, it’s the most advanced suspension setup ever on a Giant E-MTB. It’s engineered and tuned for unprecedented control and confidence on a wide range of terrain—from high-speed stutter bumps to chunky rock gardens, jumps and blind drops.

Lightweight yet Powerful
When you’re climbing to get to the next descent, you want a high level of peak power to make quick work of the steepest, most challenging sections. You also want a long-lasting battery for big days in the backcountry. And you want lightweight agility for optimal handling on technical terrain, uphill or downhill.

Premium Protection
Built to shred hard and take a beating, the Reign Advanced E+ features key innovations to protect your investment. The frame has an integrated dual-density battery cover on the underside of the down tube. In addition to safeguarding the battery and frame against rocks and other debris, it protects the bike when it’s loaded on chairlift mounts, trailer carriers, or pickup truck beds.

Energypak Battery
Powering a new 48-volt system that’s purpose-built for the needs of E-MTB riding, this integrated 560Wh battery produces more power with less stress on its cells. It’s exceptionally durable, giving you up to 2300 full charge cycles—more than any other E-bike battery. And it recharges rapidly, reaching 80% battery capacity in as little as two hours.

Syncdrive Pro 3 Motor
Our latest SyncDrive Pro motor has been upgraded from a 36-volt system to 48-volt, delivering more support—up to 800 watts of peak power. The new system also runs at 30% lower amperages, which reduces heat and motor stress for greater efficiency. The result: more peak power for longer. The motor is also highly tunable, letting you adjust torque and support levels to match your ride. Go full power for steep climbs, or dial it back to save energy on long rides.

Ridecontrol ERGO 4
Yhe new RideControl Ergo 4 builds on the previous generation Ergo 3 with a sleek, grip-integrated 3-button remote control unit. It blends seamlessly with your handlebar and grips and has a larger, more concave shape and improved tactile feedback. The buttons are designed to make it easy to switch power modes, even in rough riding conditions or when you’re wearing thick gloves. You can install it on the left or right side—or both for ultimate control. And the RideControl App lets you configure it to your own personal preferences.

Ridecontrol Go Lux
Beautifully integrated into the top tube of the Reign Advanced E+, RideControl Go Lux features a new larger 2.4-inch, high-resolution color screen that clearly displays key ride data including speed, time, distance, and cadence—along with battery status, remaining range and front and rear tire pressure. A single intuitive button lets you easily power the bike on or off, accompanied by clear audio cues. It has a robust waterproof rating and internal cable routing, allowing for a sleek, uncluttered cockpit setup.

Aegis Tyre Checker
Managing tire pressure is critical to off-road performance, and this new feature makes it easier than ever. When you power on your E-bike, front and rear tire pressures are displayed on the RideControl Go Lux display. It also shows real-time pressures as you ride and instantly alerts you if pressures reach a set limit or drop rapidly.

Aegis E-Lock System
The E-Lock disables motor support and digitally locks the bike via app, remote, or PIN. If moved without authorization, an audible alarm sounds instantly, ensuring peace of mind and real protection every time you stop.

Aegis Find My
Enhanced security and anti-theft feature using Apple Find My function lets you set up separation alerts, locate your E-bike remotely and receive notifications if its location changes. Privacy protections ensure that your location information is encrypted on Apple servers and retained for only 24 hours.

Maestro Suspension
Our adaptable rear suspension system for select Giant mountain bikes and E-MTBs delivers a smooth, active suspension platform with proven performance on a variety of terrain.

Flipchip Maestro 3
This technology lets you quickly adjust the frame geometry to three different positions (low, mid, high) to suit your riding style and terrain.

Flipchip Headset
This new three-position flip chip at the headset lets riders quickly fine-tune cockpit dimensions and geometry for their riding style and terrain.

Advanced Composite
Mainframe and rear swingarm crafted with high-performance grade raw carbon fiber and custom resin that’s custom made in Giant’s own composite factory. Handcrafted monocoque construction makes it extremely lightweight, stiff and compliant.

Specifications

Frame: ALUXX SL-grade aluminium, Advanced Forged Composite upper rocker, 160 mm Maestro suspension system, Boost 12 x 148 mm, Universal Derailleur Hanger
Motor: SyncDrive Pro, 85 Nm, powered by Yamaha
Sensor / Controller: RideControl GO integrated in top tube, RideControl Ergo 3
Display: Wireless display compatible
Battery: EnergyPak Smart 800, EnergyPak Plus range extender compatible, excluding size S
Fork: RockShox Domain R 29er, 170 mm travel, 15 x 110 mm Boost, Maxle Stealth, e-bike approved
Rear Shock: Fox Float DPS Performance, EVOL Large Volume sleeve, 2-position lever, 205 x 62.5 mm trunnion mount, custom tuned
Shifters: Shimano Deore or MicroShift XLE Xpress
Front Derailleur: N/A
Rear Derailleur: Shimano Deore 12-speed or MicroShift XLE
Crankset: Praxis Wave 36T cold forged 4130 premium steel chainring with Praxis e-Cadet+ custom forged crankarms, S/M: 160 mm, L/XL: 165 mm
Bottom Bracket: Motor-integrated e-bike system
Cassette: Shimano Deore CS-M6100-12, 10-51T, 12-speed
Chain: Not specified; supplier list repeats cassette specification
Chain Guide: MRP 1X HD2 custom co-moulded chain guide
Brakes: Shimano Deore BR-M420, 4-piston hydraulic disc
Brake Levers: Shimano Deore, I-Spec EV
Rotors: 203 mm front and rear
Front Rim: Giant AM 29 inch, tubeless ready, 30 mm inner width
Rear Rim: Giant AM 27.5 inch, tubeless ready, 30 mm inner width
Front Hub: Shimano MT410 Boost, Center-Lock, 110 x 15 mm thru-axle
Rear Hub: Shimano MT410 Boost, Center-Lock, 148 x 12 mm Micro-Spline drive body thru-axle
Spokes: Sapim Race front, Sapim E-Lite rear, e-bike optimised
Front Tyre: Maxxis Minion DHF, 29 x 2.6 inch, foldable, tubeless, EXO+, 3C MaxxTerra
Rear Tyre: Maxxis High Roller II, 27.5 x 2.5 inch, foldable, tubeless, DoubleDown, 3C MaxxTerra compound
Wheel Size: Mixed wheel setup, 29 inch front and 27.5 inch rear
Handlebar: Giant Contact Trail, 35 x 800 mm
Stem: Giant Contact SL 35
Grips: Giant Tactal Pro-E, single lock-on
Seatpost: Giant Contact Switch dropper, 30.9 mm, S: 125 mm, M: 150 mm, L/XL: 170 mm
Saddle: Giant Romero Trail
Pedals: Flat pedals