Reason Air 2025

The Megamo Reason Air 2025 is the Spanish brand's lightweight trail eMTB and the trail-focused sibling of the longer-travel Reason. It is built around the DJI Avinox M1 motor (105 Nm, 250 W rated, 1,000 W peak, 2.52 kg) with the removable 800 Wh Avinox FP800 battery. Travel is 140 mm front and rear via a Horst Link layout, head angle 64.5°, claimed weight 21.0 kg, and UK base price is £6,999. The Reason platform has built a strong reputation through 2025 — @Toomanybikesnotenoughlegs says the 160 mm Reason "suits all-use riding from single track/forest roads to Lake District and bike parks without feeling under-suspended", and the same Megamo engineering carries into the lighter-travel Air.

Drive system and range. The DJI Avinox M1 is the first-generation Avinox motor — 105 Nm of torque and 1,000 W peak, with a boost mode up to 120 Nm. It is lighter than the newer M2 and M2S (2.52 kg vs 2.65 kg), and remains plenty of motor for trail-focused use. Pairing the M1 with the full 800 Wh FP800 battery gives this bike notably more range than rivals running smaller packs — expect 1,300-1,800 m of climbing on a single charge in trail conditions, helped by the efficient 140 mm Horst Link kinematics. The DJI app provides ride data, mode customisation and OTA firmware updates. Megamo confirms the 2027 Reason AL05 will move to the M2S, suggesting M1-equipped 2025 stock will become discounted as inventory transitions.

Geometry and handling. A 64.5° head angle is squarely modern-trail. Reach progresses S 453 mm, M 481 mm, L 511 mm — properly long sizing that runs roughly half a size longer than typical, which @garethld confirms: "I'm usually a Large but gone Med on based on the long reach geo". Chainstay length scales with size: S 449 mm, M 453 mm, L 457 mm — Megamo follows the growing trend of size-specific rears. Wheelbase opens 1,223-1,307 mm. Riders should size down compared to other brands.

Build and value. The £6,999 base trim is loaded for the price: Fox 36 SL Performance fork (140 mm), Fox Float DPS Performance shock with 3-position adjustment, Shimano XT BR-M8220 four-piston hydraulic brakes with 203 mm rotors front and rear, and a SRAM Eagle 90 T-Type Transmission. Carbon frame, full Avinox M1 motor and 800 Wh battery for under £7,000 is genuinely competitive against equivalent Trek Fuel EXe and Specialized Levo SL builds.

Community-verified strengths. @Lawsoc rates the Megamo Reason Air alongside Orbea Rise and Unno Mith as having "low standover heights suitable for shorter riders". Rob Rides EMTB describes the 160 mm Reason platform as "a rocket on my first ride" with "super slim" frame integration. @deertrackdoctor reports a strengthening Megamo dealer presence in the UK with "3 megamo dealers within a 1hr 30 mins drive of my house" including the well-regarded Pedals in Dunfermline.

Caveats and known gripes. Rob Rides EMTB documents several stock-spec criticisms on the wider Reason platform: "stock EXO casing tyres too light, 35 mm stem too twitchy (50 mm recommended), headset cable routing adds maintenance, non-removable battery on alloy variants, mild flip chip geo change, 20 mm bar rise too short for larger sizes, size Large runs more like XL". Aftermarket stem, bars and tyres are recommended early upgrades. The DJI Avinox M1 is the older first-generation motor — riders chasing maximum torque should consider a later model with M2S (150 Nm). @simonali19 notes the 21 kg weight is "significantly more than comparable human-powered FS bike", which complicates vehicle loading.

Verdict. The Megamo Reason Air is for the rider who wants Avinox M1 power, a carbon Horst Link platform with 140 mm balanced travel, and 800 Wh of real range at a sharp £6,999. It suits trail-focused riders willing to invest in stem, bar and tyre upgrades to dial in the bike. It is not for buyers needing the latest M2S motor, those put off by headset cable routing, or anyone outside the long-reach sizing window. Production status is current with the 2027 platform moving to Avinox M2S — making 2025 Reason Air stock a likely value play in coming months.