Reactor 275 Alloy Pro
A 27.5″ aluminum frame full suspension trail bike with high-end components.
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Manufacturer Price
$4,299Weight | 32.0 lbs |
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Frame | Aluminum |
Suspension | Full, 140 / 160mm |
Fork | RockShox Lyrik Select+ |
Shock | RockShox Super Deluxe Select+ |
Wheels | 27.5″ Aluminum |
Drivetrain | 1 × 12 |
Groupset | GX Eagle |
Brakes | Hydraulic Disc |
Seatpost | Dropper |
For This Bike
Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.
Compare the full Reactor model range
View ComparisonMay 2022 · Tom Marvin
Riders looking to aim their front wheel down the steepest, roughest tracks will find the Reactor fits the bill
Smooth suspension paves the way for high-speed fun
Decent kit
Stout front end
Bit of a drag on the hills
Takes effort to generate speed on flatter terrain
Nov 2021 · Paul Burwell
If you’re a rider that’s focused on shredding singletrack rather than bike parks, the Nukeproof Reactor Pro 290 Alloy is a superb mid-travel trail bike
Superb balance, insanely fast singletrack shredder
A little lightweight for burlier riders
Dec 2020
Recently re-launched and now a full time member of the Nukeproof Reactor family, the Reactor 290 ST is a shorter travel version of the full suspension trail bike. With a lithe and resposive feel and top spec components, this bike – so long as you're happy to lock out the shock for climbing – makes a mean mile muncher. Merida One-Forty 600 review Vitus Mythique 29 VRS review The best ways to find new mountain bike trails As a 125mm full suspension trail bike, the Reactor 290 ST was designed for legendary downhill and enduro racer Sam Hill to ride in the off-season.
Oct 2020
We take a look at the 2021 Reactor trail bike offering from Nukeproof, including a new higher spec aluminium build and the Reactor ST.
Oct 2020 · Nukeproof
Designed as the ultimate hard-charging hooligan of a trail bike and conceived for those riders that are looking for ultimate speed and style out on the trails, the RS is slightly over-forked, featuring +10mm of travel up front over the rest of the range to excel when on the most technical and mini enduros and downhill trails. .
Mar 2020 · McCoy
Shredding trails since 1996
Mar 2020 · Iceman2058
Nukeproof's take on the short/mid-travel trail bike turns out to be very capable - and tons of fun to ride.
Jan 2020
The Reactor feels like a bike with classic, old school all-mountain intentions, constructed with the colloquialisms of the contemporary mountain bike.
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. BB Standard: BSA, 73mm, Threaded Colors: Turmeric Yellow; Rosso Red |
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Fork | RockShox Lyrik Select + Charger 2.1 RC 160mm, 46mm Offset, BOOST, Debonair, Gloss Black Travel: 160mm Spring Type: Air |
Shock | RockShox Super Deluxe Select+ RT, Custom Compression LIN, Rebound L 320 tune, 210x55mm, Bearing End, 1x bottomless token fitted. Travel: 140mm |
Bottom Bracket | BSA, 73mm, threaded |
Headset | Nukeproof, 44-56 IITS |
Stem | Nukeproof Neutron AM, 45mm, black |
Handlebar | Nukeproof Horizon V2 25mm Rise, Width - S780mm, M780mm, L800mm, XL800mm |
Saddle | Nukeproof |
Seatpost | Brand-X Ascend internal, 31.6mm, S:125mm drop; M:150mm drop; L: 170mm; XL:200mm drop Type: Dropper |
Grips | Nukeproof Sam Hill Signature |
Rear Derailleur | SRAM GX Eagle 12-Speed |
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Crank | SRAM GX Eagle 12-Speed, 170mm, 32T, B148, DUB |
Shifters | SRAM GX Eagle 12-Speed |
Cassette | SRAM GX Eagle 12-Speed, CS XG1275 EAGLE 10-52T |
Chain | SRAM GX Eagle 12-Speed |
Chain Guide | N/A |
Brakes | SRAM Guide RE Type: Hydraulic Disc |
Rims | Front: Nukeproof Neutron V2 27.5"", Tubeless Ready, 32h, 110x15mm, Rear: Nukeproof Neutron V2 27.5"", Tubeless Ready, 32h, SRAM XD Driver with 36 points of engagement, 148x12mm |
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Tires | Front: Maxxis Assegai 27.5”x2.5 WT 3C MaxxTerra/EXO+/TR, Rear: Maxxis Dissector 27.5”x2.4 WT 3C MaxxTerra/EXO+/TR |
Last updated July 6