GIANT REIGN SX FULL SUSPENSION MTB BIKE 2026 MOONSTONE

Big hits and all-out descents.

This trail-crushing enduro machine delivers confidence and control for the rowdiest terrain. Its mixed wheel size, with a 29-inch front and 27.5-inch rear, blends stability and speed with agility that pops.

Key Features

• Trail Ready: ALUXX SL-Grade Aluminium frame, a dropper seatpost and wide, grippy tires keep you planted and help you tackle technical trails.
• Balanced Agility: Obstacle-eating 29/27.5-inch wheels offer smooth handling and roll easily over small roots and rocks.
• Custom Tuned Suspension: The 160 mm of Maestro Suspension was developed and tested under the extreme conditions of Enduro World Series races.

Full Specification

• 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
• Shifters: microSHIFT Trail Trigger Pro, 1x10
• Crankset: Praxis Cadet HD M24, 32t, 165mm, 55mm chainline
• Cassette: microSHIFT Advent X, 11-48
• Chain: KMC X-10
• Front Derailleur: N/A
• Rear Derailleur: microSHIFT Advent X
• Bottom Bracket: Praxis, press fit
• Pedals: Not supplied
• Rims: Giant TRA 2 wheelset, 6061 alloy, hookless, 30mm inner width, 40mm outer width, 21mm height, Wide Guard Technology
• Front Hub: Giant MTB alloy, six-bolt
• Rear Hub: Giant MTB alloy, 72 POE, six-bolt, MicroSpline driver body
• Front Tyre: Maxxis Assegai 29x2.5 WT, 3C MaxxTerra, EXO+, TR 
• Rear Tyre: Maxxis Assegai 27.5x2.5 WT, 3C MaxxGrip, DD, TR tubeless
• Brakes: TRP EVO DH-R, hydraulic, TRP rotors [F]220mm, [R]200mm
• Brake Levers: TRP EVO DH-R
• Handlebars: Giant Contact SL TR35, 800x35mm, 20mm rise
• Handlebar Grips: N/A
• Stem: TruVativ Descendant Direct Mount 35, 50mm
• Saddle: Giant Romero
• Seatpost: Giant Contact, 30.9mm, 400mm
• Extras: Tubeless prepared, 2.5" max tyre size, 36t max chainring size, MRP AMG CS chain guide
• Weight: N/A

We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.

Bike and frame weights are based on pre-production painted frames at time of publication. Weights may vary in final production.

We offer several delivery options:

Store Collection: Pick up your order at our Salts Mill store, located at BD17 7EH.

Standard Delivery We partner with APC Euro-Tran for deliveries. Once your bike is dispatched, it typically arrives within 1 to 3 working days for Mainland UK. All bikes are fully built, checked, set up and then packed back down into a standard size bike box. Please note that electric bikes will be shipped in two boxes due to weight and size restrictions. We recommend our premium delivery service for electric bikes.

Premium Delivery We partner with DX's two-person delivery team. After dispatch, your bike usually arrives within 2 to 4 working days for Mainland UK. DX will contact you before delivery to schedule a convenient delivery date. All bikes come fully built, checked, set up and with both wheels attached. Trek bikes can only be sent via our premium delivery service.

Check out our video for more information on how your bike is assembled and packaged. 

At All Terrain Cycles, we want you to ride with confidence every time. To ensure your bike or e-bike stays in peak condition, here are some essential safety and maintenance tips.

Bicycle Safety 

Always wear a helmet – Safeguard against head injuries by using a properly fitted, safety-certified helmet.

Perform pre-ride checks – Before each ride, verify that brakes, tyres, and gears are in good working order.

Stay visible – Utilise lights and reflective gear when cycling in low-light conditions.

Follow road rules – Ride responsibly and remain aware of your surroundings.

Aftercare for Your New Bike Initial Check-Up (First 50-100 miles)

Gear Adjustment – New cables may stretch slightly; have a qualified mechanic check and adjust them.

Brake & Wheel Check – Inspect brakes for wear and ensure wheels are aligned properly.

Lubrication – Apply chain oil and check bolt tightness to maintain smooth performance.

Tyre Pressure – Regularly monitor to prevent flats and enhance efficiency.

Pedals - Ensure pedals are still tight and correctly fitted.

Routine Maintenance (Every Few Weeks)

Chain Care – Clean and lubricate your chain to minimise wear and prolong its life.

Brake Safety – Check brake pads and responsiveness before each ride.

Tyre Inspection – Look for punctures and ensure correct air pressure.

Handlebar & Stem Alignment – Confirm they are tight and secure to prevent instability.

Frame Safety Check – Look for any signs of damage or cracks.

Pedals - Ensure pedals are still tight and correctly fitted.

Professional Check-Ups

Have your bike serviced at least once a year, or more frequently if you ride often.

Aftercare for Your New Electric Bicycle (e-Bike) Initial Check-Up (First 50-100 miles)

Battery Care – Fully charge your battery (if required) before the first ride and store it in a dry, moderate-temperature environment.

Avoid Overcharging – Unplug the charger once fully charged to extend battery life.

Pedals - Ensure pedals are still tight and correctly fitted.

Routine e-Bike Maintenance (Every Few Weeks)

Motor Inspection – Listen for unusual noises and ensure smooth operation.

Battery & Connection Checks – Inspect cables and connectors for dirt, moisture, or damage.

Pedals - Ensure pedals are still tight and correctly fitted.

Seasonal e-Bike Maintenance

Check Electrical Components – Ensure wires and connections are clean and secure.

Professional Servicing – Have your e-bike inspected at least once a year or every 500-1000 miles for optimal performance.

By following these aftercare guidelines, you’ll help ensure that your bicycle runs smoothly, lasts longer, and remains a joy to ride. Stay safe and enjoy the ride!

Read our full advice

If you have any problems or concerns: Contact All Terrain Customer Services on 01274 588488 or email sales@allterraincycles.co.uk