Nukeproof Mega AM 275 Pro – first ride review

Faster, smoother and more controlled than the 2013 model

Our rating 
4.5 out of 5 star rating 4.5
GBP £3,199.99 RRP | AUD $5,935.00 | USD $5,116.00

Our review

Combines serious downhill swagger and all-round enduro control with a top-value ready-to-race kitlist
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Nukeproof’s remodelled Mega AM was one of our favourite enduro bikes of last year. For 2014 it gets the season’s must-have mid-sized 650b wheels, with slightly altered geometry to suit.


The result is an even faster, smoother and more controlled version of the super surefooted, swaggeringly confident Mega we already loved.

Frame and equipment: nothing to hold you back

If you’re looking for smooth and subtle sculpting, the Mega isn’t for you. The squared-off tubes are joined with flanged keystone sections for maximum weld area at the dropouts, chainstay bridge and linkage mount, and the bottom bracket and lower pivot block is seam welded for maximum strength.

Instead of a conventional seatstay bridge there’s a big, curved cross tube in front of the seat tube that gives masses of mud clearance, despite the big wheels and high volume, high grip tyres.

A continuous-outer-cable gear line and hoses for the stealth-routed dropper post and rear brake are clamped to the top side of the down tube for protection, and the lower bolts can also take a water bottle. The result of all this is a serious chunk of metal with weight to match, but it’s strong and carves corners like a plough.

RockShox‘ Pike fork and Reverb seatpost are the ultimate enduro double act and there’s nothing in the rest of the kitlist to make you back off. The chain is kept on the downhill-strength Truvativ Descendant cranks with an MRP/SRAM X0 guide and a clutch-equipped rear mech. There’s plenty of power in the Avid brakes, and Nukeproof’s 650b Generator wheels seem as tough as their proven smaller siblings so far.

Ride and handling: what you see is what you get

The Mega AM’s intentions couldn’t be more obvious from the start. It pedals well considering the weight – especially if you flick on some compression damping via the lever on the RockShox shock – but the stubby stem, wide bar and slack-angled fork are all about descending with maximum confidence.

While the axle path might be a simple arc, the long-stroke piggyback shock operates at a lower ratio than most competitors. This gives it more oil movement to absorb each hit with and less explosive pressures for the twin-speed rebound to control.

The bigger wheels reduce the effective angle of tyre contact enough that the bike hangs up noticeably less on flat-faced hits than before, and the longer contact patch boosts grip.

The switch to 650b has lowered the bike’s centre of gravity too – more of its weight now sits below hub height, and this lets you take serious liberties with the chunky side knobs of the Maxxis rubber.


It’s properly rule-bending when it comes to how much speed and how low a lean angle you can take into a corner and still expect to come out rubber side down.

Product Specifications


Name Mega AM 275 Pro (14)
Brand Nukeproof

Brakes Avid Elixir Trail 9
Cranks Truvativ Descendant 36T
Fork RockShox Pike RCT3, 160mm (6.3in) travel
Frame Material Hydroformed, double-welded 6061-T6 alloy, 160mm (6.3mm) travel
Front Derailleur SRAM X0 Type 2
Handlebar Nukeproof Warhead 760mm
Rear Derailleur SRAM X0 Type 2
Rear Shock RockShox Monarch Plus RC3
Saddle Nukeproof Trail Mega
Seatpost RockShox Reverb Stealth
Shifters SRAM X9
Stem Nukeproof Warhead 50mm
Weight (kg) 14.38
Wheelset Nukeproof Generator (15mm front, 142x12mm rear)
Weight (lb) 31.7
Tyres Maxxis High Roller 27.5x2.3in