Bird picture it simply arsenic "an all-mountain instrumentality with a bias towards gravity racing." That mightiness beryllium putting it mildly, though, due to the fact that the motorcycle pumps retired 160 mm of rear instrumentality question successful modular signifier but tin make 180 mm with an optional linkage, tin accommodate 160-180 mm forks and boasts adjustable geometry that tin get beauteous wild.

Cables tin beryllium tally wrong oregon extracurricular the tubes, but alas, not done the headset.

Frame Details

The Aeris 9 framework whitethorn look akin to Bird's 150mm-travel AM9, but it's an all-new aluminum conduit acceptable designed to header with the stresses of 180 mm forks. Among different differences, the Aeris 9 takes vantage of SRAM's Universal Derailleur Hanger.

One diagnostic that's casual to miss is simply a flip spot successful the chainstay (Horst) pivot which simultaneously changes the chainstay length, BB tallness and framework angles.

The top-tube mounted daze tin acceptable a ample vessel adjacent with a piggyback reservoir. An optional daze nexus increases the question from 160 mm to 180 mm portion utilizing the aforesaid 65 mm changeable shock. There's small accusation astir the kinematics astatine this point, but it's offered with some coil and aerial shocks.

Geometry

Bird person gone large connected sizing. With sizes going from Medium to XL, the Aeris 9 is aimed astatine riders connected the taller portion of the spectrum; support successful caput that Bird besides connection 27.5"-wheeled bikes with Small sizes included. The Medium is recommended for riders astir 168 cm (5'6"), portion the XL is for those astir the 194 cm (6'4") mark. With a 544 mm reach, the XL size mightiness beryllium champion suited to those pushing 2 meters.

The supra illustration is for the motorcycle with the abbreviated chainstay flip-chip mounting and a 160 mm fork. In the alternate flip-chip setting, the chainstay magnitude is 6 mm longer, the BB is 7 mm little and the framework angles are 0.5-degrees slacker. Fitting a 180 mm fork volition instrumentality astir a further 0.8-degrees disconnected the angles. In the abbreviated chainstay setting, the caput space goes from 64 degrees with a 160 mm fork to 63.2-degrees with 180 mm, but this could spell to 62.7-degrees with the little flip-chip setting. Simple, right?

In summation to each that complexity, the effectual spot space changes by size, from 77° successful the Medium to 78.5° successful the XL - that's successful the steepest configuration of fork question and chainstay setting.

Specs and Pricing

Bird instrumentality vantage of their direct-sales exemplary to connection implicit customisation of the parts and setup utilizing their online configurator. Supply problems notwithstanding, you person a prime of astir each the components. The thought is you tin get the motorcycle you privation from time one, without wasting clip and wealth swapping parts to your tastes.

You tin prime parts from RockShox, Fox, SRAM, Shimano, RaceFace, MRP, Hope, DT Swiss and Formula. You get a prime of Maxxis tires too.

Want an XT shifter with your Deore drivetrain? No problem. Need to lucifer the colors of your headset and hubs? We’ve got you covered. Need your bars chopped to 764.2mm? Sure - we’ll bash that for you.—Bird

By today's standards, the pricing is comparatively cheep ... I mean cheap. The Aeris 9 frameset starts astatine £1,430 and the entry-level physique starts astatine £2,870. Bird recommends aiming a small higher up the pecking order, though, suggesting a physique with a SRAM GX Eagle drivetrain, SRAM G2R Brakes, RockShox Lyrik Ultimate fork and Super Deluxe Ultimate Coil shock, Bird Factory wheels, Maxxis Assegai tires and Bird & RaceFace finishing kit - for astir £3,875.

Bikes are disposable to bid internationally present astatine www.bird.bike. Demos tin beryllium arranged successful the UK astatine Bike Bothy’s stores successful Pitfichie and Laggan, Glencoe Mountain and Bird's showroom successful Eversley, Hampshire.