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Picture of Nukeproof Reactor 290 Carbon Mountain Bike Frame (2020)

Nukeproof Reactor 290 Carbon Mountain Bike Frame (2020) - £2499.99

Top Features:

  • Frame: Ultra Strong T700/800 Monocoque Carbon Fibre (including rear stays)
  • Rear Shock: RockShox Super Deluxe Ultimate RCT
  • Custom tuned rear shock configuration
  • Internal cable routing
  • Enduro Bearings
  • Threaded 73mm BB
  • Boost 148mm rear axle spacing
  • 3D contoured frame protection
  • 2 position adjustable Flip chip system
  • 2 colour options; Concrete Grey or Bottle Blue

Product Data

  • Model Year: 2020
  • Steerer: Tapered
  • Bottle Cage Mounts: Single
  • Wheel Size: 29" (622)
  • MTB: Yes
Named after its 1996 original model, Nukeproof's all-new full carbon fibre Reactor 29er frame is ready to attack the trails. Built around a trail-focused platform and even boasting adjustable geometry, the trail riding game has changed.


This frame is the perfect platform from which to build up your dream aggressive high-performance trail bike. Built around a full UD woven carbon fibre frameset, it’s as at home on the most technical trails as it is on technical descents, and will guide you down the most challenging routes with ease. These capabilities are thanks to the frame’s hydro-formed tube set and carbon seat stays, which help to ensure consistent handling with a low unsprung weight. This low weight also makes the suspension as active as possible, smoothing out the roughest routes so you can maintain speed and control.

4 Bar Horst Linkage Rear Suspension

In addition to a low overall frame weight, the Reactor 290 frame has a 4 bar horst linkage back end. This gives increased anti-squat for when you’re riding in the climbing gears to attack a climb and lower anti-squat for putting the power down. This means your custom rig will not only climb efficiently, it will become a trail hooligan on the way down! Plus, the combination of low anti-squat and progressive rate provides outstanding small bump compliance to remove trail chatter, great mid-stroke support for cornering/pumping and end stroke progression for aggressive riding. Nukeproof’s extensive testing has found that this frame's anti-rise figures allow it some squat when braking hard, maintaining your riding position and giving the ideal amount of pressure through the tyre, to ensure traction.

Adjustable Frame Geometry

To give you the edge on the most challenging trails, you can also adjust the geometry of this frame to suit your riding style and the trails your ride. This is as the Reactor features “flip-chip” adjustment on the rear linkage. The “Trail” mode, as the name suggests, is best for trail riding, giving you the perfect balance of a steeper head and seat angle for maximum pedalling efficiency and still ideal position for descending at pace. The “Rail” setting turns your ride into a real corner shredder, by dropping the bottom bracket by 6mm and the head angle by half a degree, maximising this frame's descending capabilities.

Additional information:

Fork Travel: 140mm
Axle to Crown: 554mm
Fork Offset: 51mm
Shock Travel: 130mm
Wheels Size: 29"
Max Tyre Size: 2.6"
Shock Size: 210x50mm
Shock Hardware F: 25x8mm
Shock Hardware R: 30x8mm
Sizing: M/L/XL
Headtube: 44-56mm Tapered Semi-Integrated
Headset: ZS44-28.6 - T2 / ZS56/40 - B8
Bearings Required: 2x NP-5 (6902 2RS), 4x NP-7 (6800 2RS), 4x NP-106 (6901 2RS)
Seatpost: 31.6mm (Internal Routing for Dropper Seatpost)
Seat Clamp: 36.4mm
BB: Threaded 73mm BSA
Rear Hub: Boost 148x12mm
Rear Axle: SRAM Maxle Stealth M12x1.75 180mm
Chain Guide: ISCG05
Brake Mount: 180mm Direct Post
Protection: 3D Contoured Rubber Frame Protection for DT/SS/CS

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