Muddymoles mountain biking in the Surrey Hills and Mole Valley

Bird Aether 9 AL specification and geometry

Posted by Matt | January 7, 2022 | 1 comment so far

Bird Aether 9 in Tungsten Grey
Bought in February 2021 but not out on the trails until March, this is the specification and geometry of my Bird Aether 9 full suspension mountain bike.

This bike has turned out to be a great purchase, which deserves review of its own. There are a couple of areas of the specification I might tweak but nothing – apart from deeper pockets – that stops it being an absolute pleasure to ride right out of the box.

If you want a Bird Aether 9 of your own, find it on the Bird Bikes website.

Bird Aether 9 AL specification

Colour Tungsten Grey
Frame Aether 9 6066-T6 aluminium frame
130mm travel, 12x148mm bolt thru rear axle, clearance for 29×2.6 tyres, ISCG05 chainguide mount, full continuous external cable routing
Fork RockShox Pike RCT3
140mm travel, 51mm offset, 29″, 15x110mm Boost, Thru axle, DebonAir air spring, Charger 2 damper cartridge, Low-speed compression adjustment to firm, Tapered steerer
Rear shock Rock Shox Deluxe Select + RT Debonair
Shifter Shimano Deore M6100
12 speed
Rear derailleur Shimano Deore M6100
12 speed, long cage
Cassette Shimano Deore M6100
12 speed, 10-51
Chain Shimano Deore M6100
Chainset Shimano Deore M6100
170mm, 32T chainring, 52mm chainline
Bottom Bracket Shimano Deore M6100
BSA, 73mm
Brakes Shimano SLX M675
2 piston, tooled reach adjust, steel-backed organic pad
Discs Hope Technology floating disc
FW: 203mm,
RW: 180mm
Headset Bird
ZS44;28.6 | ZS56;40
Stem Nukeproof Horizon
50mm, 35mm clamp, Purple
Handlebar Race Face Next 35 Carbon
760mm, 20mm rise, 8° backsweep, 35mm clamp
Grips Ergon
GA3 in Purple
Seatpost Bird Down Dropper V2.1
150mm, 31.6 internal
Seat clamp Nukeproof Horizon
34.8mm, Purple
Saddle SDG Bel Air 3
Lux-alloy rails, 260mm x 140mm
Rims Hunt Trail Wide
29″, 32H, 30mm internal, tubeless ready
Hubs Hunt
FW: 15x110mm Thru Axle,
RW: 12x148mm Thru Axle
Tyres Maxxis
FW: Minion DHF Maxx-Terra 3C WT 29×2.5,
RW: Ardent 29×2.4

Bird Aether 9 geometry chart (with 140mm fork)

Bird Aether 9 geometry chart

Sizes M ML L XL
Effective Toptube Size M605 mm Size ML630 mm Size L655 mm Size XL680 mm
Reach Size M461 mm Size ML484 mm Size L507 mm Size XL528 mm
Stack Size M625 mm Size ML634 mm Size L643 mm Size XL652 mm
Seattube Size M395 mm Size ML420 mm Size L445 mm Size XL470 mm
Chainstay Size M430 mm Size ML430 mm Size L430 mm Size XL430 mm
Head Angle static / sagged Size M65 / 64.8° Size ML65 / 64.8° Size L65 / 64.8° Size XL65 / 64.8°
Seat Angle Size M77° Size ML77° Size L77° Size XL77°
BB Drop static / sagged Size M40 / 81 mm Size ML40 / 81 mm Size L40 / 81 mm Size XL40 / 81 mm
BB Height static / sagged Size M330 / 289 mm Size ML330 / 289 mm Size L330 / 289 mm Size XL330 / 289 mm
Wheelbase Size M1208 mm Size ML1235 mm Size L1262 mm Size XL1289 mm
Headtube Size M110 mm Size ML120 mm Size L130 mm Size XL140 mm
Axle to Crown Size M551 mm Size ML551 mm Size L551 mm Size XL551 mm
Fork offset Size M42 mm Size ML42 mm Size L42 mm Size XL42 mm

Filed under Bikes in January 2022


About the author

Matt is one of the founding Molefathers of the Muddymoles, and is the designer and main administrator of the website.

Having ridden a 2007 Orange Five for many years then a 2016 YT Industries Jeffsy 29er, he now rocks a Bird Aether 9 and a Pace RC-627.

An early On-One Inbred still lurks in the back of the stable as a reminder of how things have moved on. You can even find him on road bikes - currently a 2019 Cannondale Topstone 105 SE, a much-used 2011 Specialized Secteur and very niche belt drive Trek District 1.

If you've ever wondered how we got into mountain biking and how the MuddyMoles started, well wonder no more.

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  1. Related: Bird Aether 9 review - Bikes, Reviews - Muddymoles - mountain biking in the Surrey Hills and Mole Valley

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