Nukeproof Reactor 275 Alloy Mountain Bike FrameA full suspension trail frame that’s ready for any trail, the Nukeproof Reactor 275 Alloy model brings you the terrain-smoothing, responsive ride you need for the most technical terrain. From concept through to design, the Kinematics, the geometry and specification; this frame is designed from the ground up to be the ultimate aggressive trail performer. It is at home on technical climbs, but happiest when thrashing the most technical trails you can point it at. Frame Construction:The Alloy Reactor features a custom triple butted hydro-formed tube set and carbon seat stays, which help reduce the overall weight of the frameset. Critically this reduces the unsprung weight; making the suspension as active as possible. The Reactor 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″? Adjustable Geometry: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.Suspension Design: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: 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 ISCG05 mount Enduro Bearings Threaded 73mm BB Boost 148mm rear axle spacing 3D contoured Rubber frame protection 2 position adjustable Flip chip system Shock: RockShox Super Deluxe Ultimate RCT, Custom ML 320 tune, 210x55mm, Bearing End, 1x bottomless token fitted Headset: Nukeproof, 44-56 IITS Weight: 3.79Kgs/8.3lbs (Medium)Key Specifications: 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% (16.5mm) 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/CSBuy Nukeproof Frames & Forks from Chain Reaction Cycles, the World’s Largest Online Bike Store.