The Aeris AM9 is the enduro bike you have been waiting for. Be prepared to conquer the roughest trails and smash your personal bests.


Ben, Founder

This is the bike that changed my mind about 29 inch wheels!  Quite simply the fastest bike available for fast, steep and rough enduro courses.

The new Aeris AM9 features:

  • 29 Inch Wheels
  • 150mm front and rear travel
  • 6066 tube-set, designed to give the best stiffness to weight ratio
  • 2.5″ tyre clearance
  • Self locking mini-collet axle system
  • One piece hollow section yoke
  • 148 Boost rear end for maximum tyre clearance and stiffness
  • One piece brake/axle assembly for maximum precision and minimum squeal
  • Metric shock sizing
  • 1x specific rear end for maximum stiffness
  • ISCG05 mount
  • Bottle cage mounts
  • SRAM Maxle rear axle
  • Fantastic pedalling performance combined with a progressive shock curve
  • External cable routing, because we live in the UK
  • Threaded bottom bracket
  • Tapered ZS44/ZS56 headset
  • Reverb stealth routing
  • Max complement sealed cartridge bearings on all pivots
  • A stonkingly good price
  • 4 sizes, 3 colours and complete configuration control on all models

Geometry

We take pride in our in house developed frame geometry.  Where others follow, Bird leads.  If you don’t own a Bird then it is highly likely that your frame is too small for you. It isn’t your fault, or the fault of the manufacturer, but traditional mountain bike sizing is small. Our bikes are long and roomy without feeling stretched out. When you ride a Bird your body weight is perfectly distributed between the wheel axles, resulting in supreme stability and confidence.  Our long front ends keep the front wheel planted to the ground on steep climbs while giving you extra breathing room. Nice.

A word on chainstay lengths; some like it short, some like it long.  We like it balanced.  While super short chainstays can make a bike feel playful and easy to wheelie, they also shift your weight towards the rear axle, meaning you have to work harder to load up the front wheel during corners.  Really long chainstays provide stabilty at speed but also suck a lot of the fun out of riding and can make a bike handle like an oil tanker.  The Aeris AM9, like the 145, strikes a balance between stabilty at speed and sharp handling in the tight and twisties.

Our bikes are class leading when it comes to downhill performance.  Slack head angle, low bottom bracket and sensational rear suspension. Yes, the Aeris AM9 is an “enduro” bike through and through. What does “enduro” mean though? Modern enduro racing is a multi stage race where the riders are timed on the fun parts. If you like to crank up a hill and then blast down again as fast as possible then I think that we’ll get along just fine.

Whoa, hang on, what about those wheels?

Well spotted. This is our first 29″ wheeled bike. We knew that it had to be special. We’ve been watching the rise of the twenty-niner for quite some time now, and have been testing those bigger wheels for quite a while too.  What we found was this:  Heavy 29″ wheels suck.  An acceptable wheel weight in 27.5″ format needs to be a lot lighter in 29″ flavour in order to preserve the acceleration and handling characteristics that we have grown to love in 27.5″ wheels. Without getting too technical, it’s all down to rotating mass. On a 29″ wheel the larger diameter results in higher rotational inertia for an identical weight wheelset.  You’ll notice that our base 29″ wheel option is roughly 200g lighter than our base 27.5″ wheel option. We feel that this is important to prevent our 29″ bikes from feeling sluggish. It’s simple but it works. We’ll be adding even lighter wheel options to our 29″ range during 2018 and beyond.

But what difference does it make?  It’s all down to something called angle of attack. But i’m not going to explain that, because it’s much easier to use a shopping trolley. You see, shopping trolleys have small wheels. Push them over rough ground and they are hard work.  Push a larger wheel over the same ground and you’ll use less effort to cover the same distance.  29″ wheels on a mountain bike improve the ability of a bike to deal with rough terrain. It’s as simple as that. Bigger wheels are faster over rough ground, but for a given weight they have higher rotational inertia and take more effort to get up to speed.  Bigger rims are also slightly weaker than smaller rims, which usually means for for a similar strength wheel you need to add weight into the rim.

In short, if you ride rough trails fast then a 29er may suit you better. If you ride a mix of terrain with lots of braking and accelerating then a 27.5″ bike may work better for you.

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  • Aeris AM9 Frameset

    From: £1,100.00

    The Aeris AM9 is the enduro bike you have been waiting for. Be prepared to conquer the roughest trails and smash your personal bests. [space height="20" ] [quote author="Ben" animation_delay="0" animate="" ]This is the bike that changed my mind about 29 inch wheels!  Quite simply the fastest bike available for fast, steep and rough enduro courses.…