Reactor Alloy 290
Reactor 290 Alloy Pro Eagle90 REA01As(XXL)
- S
- M
- L
- XL
- XXL
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About Reactor Alloy 290
From concept to kinematics, geometry to spec, the Nukeproof Reactor was built from the ground up to be the ultimate aggressive trail bike. It climbs with precision but truly comes alive when you’re charging technical trails.
Constructed from a hydroformed and butted 6061 T6 aluminium alloy, with carbon fibre seat stays to reduce unsprung mass and optimise lateral stiffness. The Reactor delivers the perfect blend of low weight, strength, and stiffness.
Made for long days in the saddle, it’s your go-anywhere trail weapon—ready for epic adventures where a 1,000m climb leads to a 1,000m descent. Whatever the trail throws at you, the Reactor 290 Alloy is built to take it on.
Specifications
Frame
Nukeproof Reactor V2 290 Alloy, 140mm Travel, custom triple butted hydro-formed tube set for front triangle and chain stays, UD woven carbon fibre Seat stays, internal cable routing, ISCG 05 mounts, Max Bearings, Threaded 73mm BB, Boost 148mm rear axFork
RockShox Lyrik Select +, Charger 3.1 RC2, 29" Boost 15x110mm Maxle Stealth, Debonair, 150mm, Gloss Black, 44mm OffsetRear Shock
RockShox Super Deluxe Select+ Air, 210x55mm, Bearing End, Custom Tuned with 1 Token, Rebound 55, Compression 30, 4x LockoutWheelset
DT Swiss M1900 Spline. F: 29", 15x110mm Boost, R:29", HG Freehub, 148x12mm BoostTyres
F: Schwalbe Magic Mary Evo, Super Trail, TLE, 62-622 / 29x 2.4" Ultra Soft, R: Schwalbe Nobby Nic Evo, Super Trail, TLE, 62-622 / 29x 2.4" SoftCrankset
SRAM Eagle 90, 12-Speed, DUB, 165mm, 32T 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 XS-1270 T-Type 10-52Front Brake
SRAM Maven Base, Organic padsRear Brake
SRAM Maven Base, Organic padsRotors
F: SRAM Centerline 2.0 180mm Rounded, R: SRAM Centerline 2.0 180mm RoundedHandlebar
Nukeproof Horizon V2 25mm Rise, Width - S/M780mm, L800mm, XL800mm, XXL800mmStem
Nukeproof Neutron AM, 45mm, blackSaddle
Nukeproof Horizon SLSeatpost
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 - S/M: 29.6mm, L/XL/XXL: 31.8mmPedals
Not included **Bike Weight
15.17kg/33.4lbs (Tubeless)
Geometry
What is my size?
| SMALL | MEDIUM | LARGE | X-LARGE | XX-LARGE | ||
|---|---|---|---|---|---|---|
| A | Reach | 435 | 460 | 480 | 500 | 520 |
| B | Stack | 620.24 | 629.26 | 638.29 | 647.31 | 656.34 |
| C | Effective Top Tube Length | 578.2 | 605.28 | 621.5 | 643.51 | 665.51 |
| D | Seattube Length | 380 | 410 | 440 | 470 | 500 |
| E | Effective Seattube Angle | Low 77° / High 77,5° | Low 77° / High 77,5° | Low 77° / High 78° | Low 77° / High 78° | Low 77° / High 78° |
| F | Seattube Angle (Actual) | Low 70.5° / High 71 | Low 70.5° / High 71 | Low 70.5° / High 71 | Low 70.5° / High 71 | Low 70.5° / High 71 |
| G | Saddle Height at Saddle Offset | 650 | 700 | 750 | 800 | 850 |
| H | Saddle Offset at Saddle Height | Low 146.4 High 146.6 | Low 164.4 High 163.4 | Low 174.2 High 172.9 | Low 191.8 High 189.5 | Low 209.4 High 206.2 |
| I | Headtube Length | 100 | 110 | 120 | 130 | 140 |
| J | Headtube Angle | Low 64.5° / High 65° | Low 64.5° / High 65° | Low 64.5° / High 65° | Low 64.5° / High 65° | Low 64.5° / High 65° |
| K | Chainstay Length | 440 | 440 | 445 | 445 | 445 |
| L | Front Centre | 758.8 | 788.07 | 812.38 | 836.68 | 860.99 |
| M | Wheelbase | 1198.8 | 1228.07 | 1257.38 | 1281.68 | 1305.99 |
| N | Bottom Bracket Drop (Front/Rear) | Low -39 / High -33 | Low -39 / High -33 | Low -39 / High -33 | Low -39 / High -33 | Low -39 / High -33 |
| O | Bottom Bracket Height | Low 330 / High 336 | Low 330 / High 336 | Low 330 / High 336 | Low 330 / High 336 | Low 330 / High 336 |
| P | Stand Over Height | 745 | 750 | 755 | 760 | 765 |
| Q | Fork Travel | 150 | 150 | 150 | 150 | 150 |
| R | Trail | 132 | 132 | 132 | 132 | 132 |
| S | Fork Offset | 42 | 42 | 42 | 42 | 42 |
| T | Axle to Crown | 561 | 561 | 561 | 561 | 561 |
| U | Maximum Seatpost Insert | 210 | 240 | 265 | 295 | 320 |
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