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If you’re researching the Megamo Reason, one of the first questions you’ll ask is simple:
How much does it actually weigh?
With an 800 Wh battery and DJI’s Avinox motor onboard, the numbers matter – especially if you’re comparing AL (alloy), CRB (carbon) and Reason Air builds.
Below, we break down the real-world weights across the range and explain what those numbers actually mean on UK trails.
Want the full ride breakdown too? Our main Megamo Reason review covers handling, sizing, motor feel and which build is the best buy.
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The short answer:
Most Megamo Reason models sit between 21 kg and 23 kg, depending on frame material and spec.
That’s light for:
Here’s a simple comparison.
| Model Type | Approx Weight (Size L) | Travel |
|---|---|---|
| Reason AL (Alloy) | ~22.5–23 kg | 160 mm |
| Reason CRB (Carbon) | ~21–21.5 kg | 160 mm |
| Reason Air | ~20–21.5 kg | Mid-travel |
Want the quick build-by-build view? Here’s how the main Reason variants stack up. (Weights vary slightly by size and spec, but these are good real-world guide numbers.)
| Build | Frame | Travel Class | Approx Weight |
|---|---|---|---|
| Reason AL 03 | Alloy | Full-power 160 mm | ~22.8–23.2 kg |
| Reason AL 05 | Alloy | Full-power 160 mm | ~22.6–23.0 kg |
| Reason AL 07 | Alloy | Full-power 160 mm | ~22.5–23.0 kg |
| Reason CRB 03 | Carbon | Full-power 160 mm | ~21.4–21.9 kg |
| Reason CRB 05 | Carbon | Full-power 160 mm | ~21.2–21.7 kg |
| Reason CRB 07 | Carbon | Full-power 160 mm | ~21.1–21.6 kg |
| Reason CRB 01 | Carbon | Full-power 160 mm | ~21.0–21.5 kg |
| Reason Air AL 04 | Alloy | Mid-travel “Air” | ~21.5–22.2 kg |
| Reason Air AL 15 | Alloy | Mid-travel “Air” | ~20.8–21.6 kg |
| Reason Air CRB 08 | Carbon | Mid-travel “Air” | ~20.3–21.1 kg |
| Reason Air CRB 10 | Carbon | Mid-travel “Air” | ~20.0–20.9 kg |
Note: Weight varies with size, tyres and spec changes. If you’re comparing two specific builds, we’re happy to sanity-check the real numbers for you.
The Reason AL 05 and its siblings use a hydroformed aluminium frame but keep the same Avinox motor and 800 Wh battery as the carbon bikes.
Expect:
For context, that’s competitive with most Bosch-powered 160 mm bikes – despite running a very large battery.
Who alloy suits:
You’re gaining cost savings, not sacrificing geometry or motor performance.
The carbon builds – including the Reason CRB 01 – drop weight through the frame and higher-end components.
Typical numbers:
Carbon doesn’t transform the bike – it refines it.
The Reason Air models use the same Avinox system but reduce travel and tweak spec.
Weight typically drops closer to:
The Air feels noticeably livelier and closer to a long-travel trail bike rather than a mini-enduro rig.
Best suited to:
Numbers are useful – but context matters.
The Reason carries:
Yet it weighs roughly the same as many 600–750 Wh competitors.
That’s why the bike feels lighter than expected once moving.
Weight distribution is central and low, so:
The difference between 21 kg and 23 kg is noticeable, but geometry and tyre choice often affect ride feel more than frame material alone.
Yes – but usually not by loads. A larger frame size can add a small amount of material, and longer dropper posts / wider bars can nudge the number up slightly too.
In most cases, tyres and wheels make the biggest real-world difference. Swapping to tougher casings for UK riding can add a few hundred grams, but often improves grip, puncture resistance and ride feel more than any frame-material saving.
On weight alone, the Reason sits in a strong place for a big-battery, full-power bike. Many comparable 160 mm e-MTBs land in the same ballpark – and plenty come in heavier once you factor in tougher tyres and pedals.
Rule of thumb: if you’re seeing a quoted weight on a showroom-fresh bike with lightweight tyres, it can jump once you set it up properly for UK conditions.
If weight is your priority:
All three share the same motor character and battery size.
The choice is refinement vs budget – not performance vs compromise.
For an 800 Wh, 120 Nm full-power e-MTB, the Megamo Reason is genuinely competitive on weight.
Carbon builds sit close to 21 kg. Alloy builds hover around 23 kg. The Air models dip lighter still.
What matters more is how it rides – and the Reason consistently feels lighter on the trail than the spec sheet suggests.
If you want to compare builds directly, browse the full Megamo Reason range or book a test ride from our Ribble Valley showroom to feel the difference for yourself.
Weight questions usually come up once riders start comparing builds side-by-side – especially when you’re deciding whether carbon is worth it, or whether the Air makes more sense for your riding. Here are the quick answers.
Approximately 21–21.5 kg in size L, depending on tyre and finishing kit.
No. At roughly 22.5–23 kg with an 800 Wh battery, it’s competitive with most full-power 160 mm e-MTBs.
Yes. The Air models reduce travel and spec weight, bringing most builds closer to 20–21.5 kg.
For a 160 mm bike with 800 Wh and 120 Nm torque, yes. Many comparable bikes weigh similar or more with smaller batteries.
