Nukeproof Reactor 275 Alloy

Nukeproof Reactor 275 Alloy

From concept through to design, the Kinematics, the geometry and specification; the Reactor is designed from the ground up to be the ultimate aggressive trail bike. It is at home on technical climbs, but happiest when thrashing the most technical trails you can point it at.

To optimise the weight, strength and stiffness, the Reactor Carbon frame features a full UD woven carbon fibre frameset (Including chain and seat stays). It is available for 27.5” or 29” wheel sizes. These are two totally different, compromise free frames that were designed and developed at the same time.  Each frame is simply tailored around each wheel size.

Speed or play: which do you value more? The manoeuvrability of 27.5” or the raw speed of a 29”?

All Reactor frames feature a “flip chip” to adjust the geometry from “Trail” to “Rail mode”.

  • Trail – As the name suggests, this setting is best suited for trail riding. It is for riders who get as much enjoyment from the climb as the descents
  • Rail - The Rail setting turns the Reactor into a corner shredder, dropping the bottom bracket 6mm and slackening the head angle by half a degree. It is there to maximise the descending capabilities.

To ensure the bike could climb as well as it descends, we designed the 4 bar horst linkage to have higher levels of anti-squat for climbing gears but lower levels when you drop down the cassette. This means that the bike can behave itself on the climbs but when you get it up to speed, it turns into a trail hooligan. The combination of low anti-squat and progressive rate give ultimate small bump compliance (removes rough trail and root chatter) with good mid stroke support for cornering/pumping and end stroke progression for aggressive riding. Balanced anti-rise figures allow the Reactor some squat when braking hard, maintaining rider position and providing a good amount of pressure through the tyre to ensure traction. The Reactor is designed to reward the rider and ensure you get that stoke factor in on any ride.

 

Features

  • Aggressive Trail Bike
  • Hydro-formed 6061 Triple-Butted Aluminium Frame
  • 140mm Rear Travel
  • 2 Position Trail/Rail Flip Chip, Swinglink Driven 4 Bar Horst Link Suspension, with custom tuned shock.
  • 148mm Boost rear spacing
  • Sizes Available: Small, Medium, Large, Extra Large

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Nukeproof Reactor 275 Alloy
Nukeproof Reactor 275 Alloy
Nukeproof Reactor 275 Alloy
Nukeproof Reactor 275 Alloy
Nukeproof Reactor 275 Alloy

Full Specs

Comp Pro Frame Only 
Frame Nukeproof Reactor 275 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, internal cable routing, ISCG 05 mount, Enduro bearings, threaded 73mm BB, Boost 148mm rear axle spacing, 3D contoured rubber frame protection. Nukeproof Reactor 275 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, internal cable routing, ISCG 05 mount, Enduro bearings, threaded 73mm BB, Boost 148mm rear axle spacing, 3D contoured rubber frame protection. Nukeproof Reactor 275 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, internal cable routing, ISCG 05 mount, Enduro bearings, threaded 73mm BB, Boost 148mm rear axle spacing, 3D contoured rubber frame protection.
Fork Marzocchi Bomber Z2, 150mm, 44mm Offset, BOOST, RAIL Damper, Gloss Black (SHORT ID: D6S3) RockShox Pike Select + Charger 2 RC 150mm, 46mm Offset, BOOST, Debonair, Gloss Black  
Shock RockShox Super Deluxe Select R, Custom ML Tune, 210x55mm, Bearing End, 1x bottomless token fitted. RockShox Super Deluxe Select+ RT, Custom ML 320 tune, 210x55mm, Bearing End, 1x bottomless token fitted. RockShox Super Deluxe Ultimate RCT, Custom ML 320 tune, 210x55mm, Bearing End, 1x bottomless token fitted
Front Wheel Sun-Ringle Duroc 35 Comp 27.5", 15x110mm Nukeproof Neutron V2 27.5", Tubeless Ready, 32h, 110x15mm  
Rear Wheel Sun-Ringle Duroc 35 Comp 27.5", Shimano Microspline Driver, 148x12mm Nukeproof Neutron V2 27.5", Tubeless Ready, 32h, SRAM XD Driver with 36 points of engagement, 148x12mm  
Tyres Front: Maxxis Assegai 27.5”x2.5 WT 3C MaxxTerra/EXO+/TR, Rear: Maxxis Dissector 27.5”x2.4 WT 3C MaxxTerra/EXO+/TR Front: Maxxis Assegai 27.5”x2.5 WT 3C MaxxTerra/EXO+/TR, Rear: Maxxis Dissector 27.5”x2.4 WT 3C MaxxTerra/EXO+/TR  
Crankset Shimano Deore M6100 12 Speed Crank, 170mm, 32T, 52mm Chainline SRAM GX Eagle 12-Speed, 170mm, 32T, B148, DUB  
Shifter Shimano Deore M6100-IR, 12-speed Rapidfire Plus, I-Spec EV SRAM GX Eagle 12-Speed  
Rear Deraileur Shimano Deore M6100, SGS 12-Speed, Shadow Plus  SRAM GX Eagle 12-Speed  
Chain Shimano Deore M6100 12-Speed SRAM GX Eagle 12-Speed  
Cassette Shimano Deore M6100 12-Speed (HYPERGLIDE+), 10-51T SRAM GX Eagle 12-Speed, CS XG1275 EAGLE 10-52T  
Brakes Shimano SLX M7120, 4 Pot Brake, Metallic Pads with Fins SRAM Guide RE  
Front Rotor Shimano SM-RT66, 203mm SRAM Centreline, 200mm  
Rear Rotor Shimano SM-RT66, 180mm SRAM Centreline, 180mm  
Handlebars Nukeproof Neutron V2 25mm Rise, Width - M780mm, L800mm, XL800mm) Nukeproof Horizon V2 25mm Rise, Width - M780mm, L800mm, XL800mm)   
Stem Nukeproof Neutron AM, 45mm, black Nukeproof Neutron AM, 45mm, black  
Saddle Nukeproof Horizon SL, Black Nukeproof Horizon SL, Black  
Seatpost Brand X Ascend internal, 31.6mm, S: 125mm; M:150mm drop; L/XL: 170mm Drop Brand X Ascend internal, 31.6mm, S:125mm; M:150mm drop; L/XL: 170mm Drop   
Headset Nukeproof, 44-56 IITS Nukeproof, 44-56 IITS Nukeproof, 44-56 IITS
Grips Nukeproof Sam Hill Signature Nukeproof Sam Hill Signature  
Bearings Enduro Bearings Enduro Bearings Enduro Bearings
Weight:(Size Medium)  14.67kgs/32.3lbs (Tubeless) 14.1kgs/31lbs (Tubeless) 3.77Kgs/8.3lbs (Medium)

Geometry & Sizing

 

Small Medium Large X-Large
(A) Reach 425 454 482.5 516
(B) Stack 600 605 609 613.5
(C) Effective Top Tube Length 580 610 640 675
(D) Seattube Length 381 420 458 508
(E) Effective Seattube Angle 75.5°
(Low 75°)
75.5°
(Low 75°)
75.5°
(Low 75°)
75.5°
(Low 75°)
(F) Seattube Angle (Actual) 71°
(Low 70.5°)
71°
(Low 70.5°)
71°
(Low 70.5°)
71°
(Low 70.5°)
(G) Saddle Height at Saddle Offset 650 700 750 850
(H) Saddle Offset at Saddle Height 164.71 181.03 196.99 229.25
(I) Headtube Length 110 115 120 125
(J) Headtube Angle 66°
(Low 65.5)
66°
(Low 65.5)
66°
(Low 65.5)
66°
(Low 65.5)
(K) Chainstay Length 430 430 430 430
(L) Front Centre 728 759 790 825
(M) Wheelbase 1150 1181 1212 1247
(N) Bottom Bracket Drop -18
(Low -24)
-18
(Low -24)
-18
(Low -24)
-18
(Low -24)
(O) Bottom Bracket Height 336
(Low 330)
336
(Low 330)
336
(Low 330)
336
(Low 330)
(P) Stand Over Height 723/721 721/725 722/730 725/737
(Q) Fork Travel 150 150 150 150
(R) Trail 110.73 110.73 110.73 110.73
(S) Fork Offset 46 46 46 46
(T) Axle to Crown  545 545 545 545
(U) Maximum Seatpost Insert 175 215 250 300

Recommended Sizing

Help

  • FAQs
  • Frame Spec
  • Tech Docs
  • Where can I buy Nukeproof Bikes?
  • Nukeproof bikes, components and apparel is sold through an authorised dealer network. Check out our dealer locator for your local local stockist or preferred online store www.nukeproof.com/dealers. 
  • Do your bikes come with Warranty?
  • All Reactor frames come with a 5 year frame warranty (Please visit www.nukeproof.com/warranty for full info). On top of that we also offer an extended 2-year warranty on all components excluding wear and tear items such as bearings, brake pads, chains & cassettes etc. Our Warranty policy applies to the original owner and processed by our authorised retail partners. To see their warranty process check: www.nukeproof.com/warranty
  • Where can I demo a Nukeproof bike? 
  • We run numerous demo's through the year at major events and with our dealer network. Check out www.nukeproof.com/demo for when we may be near you. If this is unavailable to you, you can always request a demo through your local authorised stockist.  
  • What size bike do I need? 
  • All our products come with a size guide. This is designed as an indication of the size that may suit you. If you are still unsure speak with one of our dealers who will be happy to help you pick the right size and model for you. 
  • How does you bike range work? 
  • Our range is named based on specification level. Not every Bike Frame will have each specification level, but in order of price they run: Sport - Race - Comp - Pro - Elite- Factory/ST (Reactor Only) - RS   
Material: Hydroformed 6061 Triple-Butted Aluminium 
Fork Travel: 150mm (RS 160mm)
Axle to Crown: 545mm (RS 555mm)
Fork Offset: 46mm
Rear Travel: 140mm
Wheels Size: 27.5"
Max Tyre Size: 2.6"
Recommended Shock Sag (Measured seated): 30%
Shock Size: 210x55mm
Shock Hardware F: 25x8mm
Shock Hardware R: 30x8mm 
Sizing: S/M/L/XL
Headtube: 44-56mm Tapered Semi-Integrated
Headset: ZS44-28.6 - T2 / ZS56/40 - B8
Bearings Required: 2x (6902 2RS), 4x (6800 2RS), 4x (6901 2RS)
Seatpost: 31.6mm (Internal Routing for Dropper Seatpost)
Seat Clamp: 34.9mm
BB: Threaded 73mm BSA
Rear Hub: Boost 148x12mm
Rear Axle: Sram Maxle Stealth M12x1.75 180mm (Thread Length 20mm)
Chain Guide: ISCG05
Brake Mount: 180mm Direct Post
Protection: 3D Contoured Rubber Frame Protection for DT/SS/CS