A Nukeproof Reactor vs Mega decision is not really about which bike is better. Both are serious, hard-riding machines built for riders who want to push on rough ground. The real question is where you ride most, how you like a bike to feel beneath you, and whether you would rather have extra forgiveness on the big days or more energy left for another lap.
The Reactor is the lively all-rounder: a bike that pedals efficiently, responds quickly and still has far more descending ability than its travel figure might suggest. The Mega is the enduro specialist: longer, more planted and happier when the trail turns steep, fast and properly rough. Get the choice right and the bike will encourage you to ride more. Get it wrong and you may spend every mellow ride wishing you had chosen something more appropriate.
Nukeproof Reactor vs Mega at a glance
The Reactor sits in the aggressive trail bike category, generally built around 140mm of rear travel with a 150mm fork. It is designed to cover ground, climb without fuss and attack technical descents with a playful, direct feel. It makes a strong case for riders whose regular rides mix woodland singletrack, natural trails, trail-centre loops and the occasional uplift or mountain trip.
The Mega is a full-fat enduro bike, typically using 160mm of rear travel and a 170mm fork. Its longer-travel platform, more composed geometry and tougher build intent are aimed at sustained descending, steeper terrain and repeated hits. It is the natural choice for riders who plan their weekends around demanding descents rather than simply fitting one into a long loop.
Those numbers matter, but not in isolation. A 20mm travel gap changes more than bottom-out resistance. It affects the way each bike sits in turns, carries speed through braking bumps, responds to rider input and feels after three hours of climbing.
The Reactor: fast, capable and fun on ordinary rides
The Reactor makes sense because most UK rides are not enduro stages from top to bottom. They involve pedalling to the descent, traversing undulating woodland, rolling through tight turns and dealing with short, sharp climbs that reward a bike which accelerates willingly. The Reactor feels built for that reality.
Its suspension gives useful grip and control without making the bike feel detached from the trail. On flatter or more flowing ground, it responds well to a rider who pumps rollers, unweights roots and actively picks lines. It is easier to throw into a turn or lift over a puddle than a bigger enduro bike, which keeps familiar local trails engaging rather than over-biked.
That does not mean the Reactor is delicate or limited. With sensible suspension setup, strong tyres and a confident rider, it will deal with steep chutes, wet roots, rocks and sizeable jumps. It is an aggressive trail bike, not a lightweight cross-country machine. The limit is less about whether it can descend hard and more about how much margin it leaves when speeds rise, landings get rough or fatigue starts to affect line choice.
For a rider who values one bike for big pedalling days, regular trail-centre riding and weekend trips, the Reactor is often the more rewarding ownership proposition. You will notice its efficiency and agility on every ride, not only on the biggest descent of the month.
Who should choose the Reactor?
Choose the Reactor if you enjoy covering distance as much as descending, regularly ride varied terrain, or prefer a bike that feels energetic rather than glued to the ground. It also suits riders moving up from a hardtail or shorter-travel trail bike who want a substantial increase in confidence without sacrificing the sense of involvement that makes mountain biking fun.
It can be the better option for lighter riders too, although rider weight alone should not decide the purchase. A well-set-up Mega can work brilliantly for a lighter rider, just as a hard-charging heavier rider can make excellent use of a Reactor. Riding style and terrain matter more.
The Mega: confidence when the trail gets serious
The Mega earns its reputation when a descent is long enough, rough enough or steep enough to expose the limits of a smaller bike. Its extra travel is only part of the story. The chassis is designed to remain calm when you are braking hard into blown-out corners, hitting square-edged rocks or landing into uneven ground.
On fast, rough trails, that stability saves energy. Instead of fighting to keep the bike on line, you can stay centred, look further ahead and let the suspension absorb more of the chaos. The Mega also offers greater room for error. A slightly late brake, an imperfect landing or a line that turns rougher than expected is less likely to unsettle the bike.
The trade-off appears on slower, flatter rides. A Mega can certainly be pedalled all day, and modern enduro geometry is far more efficient uphill than older long-travel bikes. But it asks more of the rider on awkward climbs, feels less urgent when accelerating and may feel like more bike than necessary on smooth, tight singletrack. That is not a fault. It is the price of having a bike that remains composed when the trail becomes genuinely demanding.
If your riding includes regular uplift days, bike-park laps, steep natural descents or trips where descending is the main event, the Mega’s extra capacity is useful rather than excessive. It is also the sensible call for riders who consistently push beyond trail-bike pace and do not want to hold back when the ground deteriorates.
Who should choose the Mega?
The Mega is for the rider who seeks out the hardest line, rides aggressively in all conditions and wants a bike that stays predictable at speed. It suits enduro racing, but you do not need a number board to justify one. If your favourite rides involve steep descents, rocks, roots, jumps and repeated hard laps, the Mega is built for exactly that work.
It is also worth considering if you are a confident rider who prefers the reassurance of a bigger platform. There is no prize for buying a smaller bike if it leaves you second-guessing every rough section. The right bike is the one that gives you confidence to ride well, not merely the one with the lowest weight or shortest travel.
Geometry and handling: playful versus planted
The practical difference between the Nukeproof Reactor and Mega becomes clearest in corners and on steep ground. The Reactor encourages an active style. It feels happier being pumped through compressions, flicked between lines and loaded into a berm. It rewards precision and puts the rider close to the trail.
The Mega is more settled and more composed. Its longer, slacker stance provides stability when the trail falls away or becomes choppy. It prefers decisive riding: commit to the line, stay balanced and allow the bike to carry speed. In tight, slow turns, it may require more body language to bring around, but at pace it offers a calmness the Reactor cannot quite match.
Wheel size and specification can alter that character, so compare the actual bikes in front of you rather than relying on category labels alone. Tyres, fork choice, brakes and wheel setup make a real difference. A Reactor fitted with robust tyres and powerful brakes can lean further into descending than a lightweight build suggests, while a Mega with a practical all-day build can be more versatile than many riders expect.
Think about your usual ride, not your dream ride
A common mistake is choosing solely for the biggest trip of the year. If you visit steep mountains or an uplift centre twice a season but spend the rest of the year riding local loops, the Reactor may be the bike you use to its full potential most often. Add durable tyres, keep the suspension properly serviced and ride it well, and it will still be a very capable travel companion.
Conversely, do not buy the Reactor simply because it appears more sensible if most of your rides are hard, steep and rough. If you routinely finish descents with tired arms, reach the limit of your current bike’s suspension or deliberately avoid lines because they feel too punishing, the Mega could make riding more enjoyable and safer.
Be honest about your local terrain, your fitness and the trails you actively choose. A bike should support the riding you actually do, while leaving enough headroom for the riding you are progressing towards.
Setup matters as much as the frame
Whichever model you choose, correct setup is what turns a good bike into your bike. Sag, rebound, tyre pressures, bar height and lever position all affect grip, confidence and fatigue. A poorly adjusted Mega can feel wallowy and slow. An over-firm Reactor can feel harsh and nervous when it should be composed.
This is where buying from a specialist shop pays off. A proper handover and practical setup advice give you a starting point that suits your weight, riding kit and intended terrain. As your riding develops, regular suspension care, brake servicing and wheel checks keep either bike performing as it should. At Nirvana Cycles, that workshop knowledge comes from looking after bikes that are actually ridden hard, not just displayed on a shop floor.
So, Reactor or Mega?
The Reactor is the choice for the rider who wants a lively, capable bike for almost every kind of mountain bike day. It climbs and covers ground with enthusiasm, then delivers plenty of confidence when the trail turns technical. The Mega is for riders who put descending performance first and need the stability, travel and durability to ride hard in serious terrain.
Before deciding, picture the ride you will do next Sunday, not only the one you are planning in six months. The bike that makes that regular ride more enjoyable is usually the bike that will take you furthest.