Mega Alloy 297 / 290
Mega 290 Alloy Pro MEA01Bs(XL)
- S
297 - M
297 - L
297 - XL
290 - XXL
290
About Mega Alloy 297 / 290
The Nukeproof Mega is an enduro bike built on the tenets of balance, predictability, and absolute speed. Originally conceived as the downhiller’s trail bike, it was purpose-built to conquer the legendary MEGAVALANCHE race in France and spawned a new category of bike that would be known as Enduro forever more .
Over the past decade, the Mega has earned its reputation as a race-winning machine — with multiple Enduro World Series stage wins and four overall EWS titles to its name. It’s the evolution of relentless development and refinement, shaped by the feedback of world-class racers and dedicated riders alike.
Now in its fourth generation, every detail of the Mega has been optimised for speed, control, and efficiency — built to go flat-out, wherever the trail leads.

Optimized Geometry and Suspension Kinematics
The Nukeproof Mega’s geometry and suspension have been refined to balance stability, predictability and outright speed. Built around Nukeproof’s latest Horst link system, the kinematics are tuned to be supple off the top for small bump sensitivity, with strong mid stroke support for cornering and pumping, and a progressive end stroke that maintains control on big impacts. Optimized anti squat keeps pedalling efficient on climbs while preserving a lively, planted feel on descents. Complementing this is Nukeproof’s Long, Low, Slack and Steep geometry philosophy. Each size uses a dynamic saddle offset and size specific seat tube angles to place the rider in an efficient and comfortable pedalling position. The result is a chassis that climbs with precision, descends with confidence and remains balanced at race pace, ready to perform between the tape and beyond.
Design Features
The Nukeproof Mega is engineered from the ground up to make every ride and every maintenance task straightforward. Practical details prioritise real world use, with room for a full size 750 ml water bottle inside the front triangle and an accessory mount under the top tube for tools or spares so essentials stay close at hand. The frame provides mud clearance for tyres up to 2.6 inches, allowing consistent speed in harsh conditions. Built to last, the Mega uses MAX bearings throughout for durability and smooth performance in all weather. Accessible hardware, sensible Allen key sizes and laser etched torque markings make servicing clear and repeatable. To keep everything protected and quiet, the frame features 3D contoured rubber guards on the down tube, seatstays and chainstays. Every feature serves a bike that is fast, functional and tough enough for the world’s hardest trails.
Aluminium Frame Construction
The latest Nukeproof Mega is built around a 6061 T6 aluminium chassis engineered to achieve the ideal balance of strength, stiffness and durability. Every element of the frame, including all forged parts, has been designed with precision to deliver the planted and predictable feel expected from a race ready enduro bike. The use of hydroformed tubing and advanced welding techniques ensures exceptional reliability without adding unnecessary weight. The result is a frame made to handle the toughest trails in the world while remaining easy to maintain and service, making it the perfect choice for privateers and racers who demand both performance and longevity.
Specifications
Frame
Nukeproof Mega V4 290 Alloy, 160mm Travel, custom triple butted hydro-formed tube set, internal cable routing, ISCG 05 mount, Enduro Bearings, Threaded 73mm BB, Boost 148mm rear axle spacing, 3D contoured Rubber frame protection.Fork
RockShox Zeb Select +, Charger 3.1 RC2, 29" Boost 15x110mm Maxle Stealth, Debonair, 170mm, Gloss Black, 44mm OffsetRear Shock
RockShox Vivid Select+ Air, 230x62.5mm, Bearing End, Custom Tuned with 1 Token, Rebound 25, Compression 30, 4x Lockout. Externally Adjustable Bottom OutWheelset
Nukeproof Neutron V2. F: 29", 15x110mm Boost, R:29", HG Freehub, 148x12mm BoostTyres
F: Schwalbe Magic Mary Evo, Super Gravity, TLE, 62-622 / 29x 2.4" Ultra Soft, R: Schwalbe Tacky Chan Evo, Super Gravity, TLE, 62-622 / 29x 2.4" SoftCrankset
SRAM Eagle 90, 12-Speed, DUB, 165mm, 30T T-Type, 55mm CLShifter
SRAM Eagle 90, 12-Speed MMXRear Derailleur
Sram Eagle 90Chain
SRAM GX T-Type, 12-Speed Eagle, Flattop, PowerLock, 116 LinksCassette
SRAM CS1270 T-Type, 12-Speed, 10-52TChain Guide
Nukeproof guide with Bash, 28-36T, ISCG-05, 55mm CL, BlackFront Brake
SRAM Maven Bronze, Organic padsRear Brake
SRAM Maven Bronze, Organic padsRotors
F: SRAM Centerline 2.0 200mm Rounded, R: SRAM Centerline 2.0 200mm RoundedHandlebar
Nukeproof Neutron V2 25mm Rise, Width - S780mm, M780mm, L800mmStem
Nukeproof Horizon, 45mm, BlackSaddle
Nukeproof Horizon Enduro, Crn/Ti RailsSeatpost
Tranz-X YS108 Internal with SRAM Remote lever, S:150mm drop; M:170mm drop; L:200mm drop; XL/XXL:230mm dropHeadset
Nukeproof, 44-56 IITSGrips
Nukeproof Neutron Single Lock On, Diameter - NP1 - 29.6mm, NP2 & NP3 - 31.8mmPedals
Not included **Bike Weight
16.6kg/36.5lbs (Tubeless)
Geometry
What is my size?| SMALL - 297 | MEDIUM - 297 | LARGE - 297 | X-LARGE - 290 | XX-LARGE - 290 | ||
|---|---|---|---|---|---|---|
| A | Reach | 430 | 455 | 475 | 495 | 515 |
| B | Stack | 621.16 | 621.16 | 639.22 | 648.24 | 657.27 |
| C | Effective top tube | 567.7 | 592.71 | 610.87 | 632.79 | 654.71 |
| D | Seattube length | 380 | 410 | 440 | 470 | 500 |
| E | Effective seattube angle | 77.5° | 77.5° | 78° | 78° | 78° |
| F | Actual seattube angle | 71° | 71° | 71.5° | 71.5° | 71.5° |
| G | Saddle height for saddle offset | 650 | 700 | 750 | 800 | 850 |
| H | Saddle offset at saddle height | 142.22 | 158.59 | 166.66 | 181.58 | 196.49 |
| I | Headtube length | 100 | 100 | 120 | 130 | 140 |
| J | Headtube angle | 64° | 64° | 64° | 64° | 64° |
| K | Chainstay length | 435 | 435 | 435 | 440 | 440 |
| L | Front centre | 758.5 | 783.5 | 812.11 | 836.42 | 860.72 |
| M | Wheelbase | 1192.5 | 1217;5 | 1246.1 | 1275.39 | 1299.7 |
| N | Bottom bracket drop | 30 / 10 | 30 / 10 | 30 / 10 | 30 | 30 |
| O | Bottom bracket height | 345 | 345 | 345 | 345 | 345 |
| P | Stand over height | 721.75 | 720.28 | 721.3 | 720.73 / 730.78 | 726.77 / 736.07 |
| Q | Fork travel | 170 | 170 | 170 | 170 | 170 |
| R | Trail | 132.33 | 132.33 | 132.33 | 132.33 | 132.33 |
| S | Fork offset | 42 | 42 | 42 | 42 | 42 |
| T | Axl te crown | 582 | 582 | 582 | 582 | 582 |
| U | Maximum seatpost insert | 216 | 245 | 270 | 301 | 330 |
Reviews
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Help & support
How can we help?
Download document here.
Download 2021 Mega MX Fitting Guide here
Download Fast Shock Recommended Base Settings here
Download Push Shock Recommended Base Settings here
Download EXT Shock Recommended Base Settings here
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