Cortex GX Eagle

Cortex GX Eagle
Cortex GX Eagle
Cortex GX Eagle
Photos for illustration purposes. Please check the bike spec for detailed component listings.
Sonder Cortex GX Eagle Revelation - Crayon_Crayon
Sonder Cortex GX Eagle Revelation - Brown_Brown
Sonder Cortex GX Eagle Revelation - Green_Green
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Cortex GX Eagle

Short travel 29er full suspension mountian bike

$3,149.00

Fast and agile short travel full sus 29er mountain bike with SRAM GX Eagle drivetrain, Rockshox Pike Ultimate fork and Deluxe rear shock

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This bike is covered by our 28 Day Ride Guarantee
Customise your bike on the next page.

Buy Now. Deliveries from 12 December.

Build your bike

Select your size and make any changes you want from the standard build. When you’re done, hit Add to Bag at the bottom of the page

  • Frame

    Size
    Please select your Size
    Colour
    Please select your Colour

    Configure your Frame

    size

    • Small

    • Medium

    • Large

    • X-Large

    colour

    • Crayon

    • Brown

    • Battleship

    • Khaki

  • 1. components

    Handlebar
    Sonder Aspect Riser 780mm
    Saddle
    Seatpost
    X-Fusion Manic Drop Seatpost and Lever 31.6mm / 125mm 31.6mm / 150mm

    Configure your 1. components

    Handlebar

    • Sonder Aspect Riser 780mm

      • Sonder Aspect Riser [OEM]

      In general riser bars tend to be wider than flat bars and may have slightly more flex to give a more forgiving ride. As you go into descents and your arms drop below your knees the additional height gained on your front end will help you take control of the steep descents.

      That said you can get all bar types in a range of widths and stiffnesses and front end height can be adjusted with spacers like our Sonder Rings, so sometimes you just have to ignore the mumbojumbo and make your call on style and personal preference and there is nothing wrong with that.

    • Sonder Confucius

      +$24.99

      • Sonder Confucius

      Confucius says that you don't have to sacrifice what you love about your traditional riser bars just to get the flexibility of a hooped bar.

      We have taken our Aspect risers and evolved them in to a bar designed primarily for bikepacking. You won't have to adapt to a new hand position so you are not going to lose any control off-road and you can still get out of your saddle and power up the hills like a hero.

      If you do want to move your hands a bit a reduce the fatigue of a long ride, the hoop extends out front giving a choice of further hand positions. The bars also have a slight 'back sweep' so you can sit more upright in the saddle

      The bars have a slight riser but feel free to experiment and rotate them to your suiting. Keep them horizontal, or twist them up slightly to give yourself a streamlined TT style riding position to help you battle across a windblown Tierra del Fuego.

      Strength is not compromised as the main load bearing section of the bar is a single piece. Got gadgets? Confucius loves gadgets, and with the out-front hoop you can free up the bar around the stem. Simply attach your Garmin, 3000 lumen torches or mascots to the hoop and they will still be well within reach, maybe at an even better viewing angle and sit above your handle bar luggage.

      Take your bikepacking into the mountains; Confucius is a bar that gives you more control than a tradional swept back bar on technical terrain.

    Saddle

    • Sonder Kura 138 / Black

      +$24.99

      • Sonder Kura

      Adventure cycling is diverse; in the course of a single trip you can find km's of asphalt, traverse rutted grasslands, weave through thickly forest singletrack, climb loose gravel track or descend steep rocky trails.

      It is unlikely you are going to find a single saddle position for all of this terrain. With this in mind Kura has a flat longitudinal profile with a gentle lateral curvature to give an extended saddle area, allowing you to position yourself around the saddle as you move between road, downhill, and climbing.

      The honeycomb base reduces weight whilst still providing structure and support that adapts and flexes with your motion.

      Titanium rails giving 50 mm of forward and back adjustment to help you find your sweet spot. Titanium is more forgiving than steel so provides a little more comfort.

      Slightly wider than our Adobe saddle, it may provide additional comfort for riders with wider sit bones.

    Seatpost

    • X-Fusion Manic Drop Seatpost and Lever 31.6mm / 125mm

      • X-Fusion Manic Drop Seatpost and Lever

      The X-Fusion Manic Dropper has been designed to work well across cross-country, trail, all mountain and enduro riding.

      It works on a simple design. Inside you’ll find a closed cartridge that is both sealed and designed to be easily removable from the rest of the post. Simple construction aside, the action of this post feels super-smooth and silky.

    • X-Fusion Manic Drop Seatpost and Lever 31.6mm / 150mm

      • X-Fusion Manic Drop Seatpost and Lever

      The X-Fusion Manic Dropper has been designed to work well across cross-country, trail, all mountain and enduro riding.

      It works on a simple design. Inside you’ll find a closed cartridge that is both sealed and designed to be easily removable from the rest of the post. Simple construction aside, the action of this post feels super-smooth and silky.

    • RockShox Reverb / 125mm Drop / 31.6 x 390mm

      +$209.99

      • RockShox Reverb / 125mm Drop / 31.6 x 390mm

      The RockShox Reverb provides effortless actuation and increased reliability featuring new Vent Valve Technology.

      With reduced overall post lengths and new travel options, riders of all shapes and sizes benefit from more travel than ever before. The Reverb Stealth is just really, really reliable at simply going up and down.

    • RockShox Reverb / 150mm Drop / 31.6 x 440mm

      +$209.99

      • RockShox Reverb / 150mm Drop / 31.6 x 440mm

      The RockShox Reverb provides effortless actuation and increased reliability featuring new Vent Valve Technology.

      With reduced overall post lengths and new travel options, riders of all shapes and sizes benefit from more travel than ever before. The Reverb Stealth is just really, really reliable at simply going up and down.

  • 2. suspension

    Forks
    RockShox Pike Ultimate RCT3 29er / 130mm
    Shock
    Rockshox Deluxe Select+ / 190x45

    Configure your 2. suspension

    Forks

    • RockShox Pike Ultimate RCT3 29er / 130mm

      • RockShox Pike Ultimate RCT3

    • Cane Creek Helm MK2 Air / 29 / 130mm 130mm

      +$0.00

      • Cane Creek Helm MK2 Air / 29 / 130mm

    • Cane Creek Helm MK2 Air / 29 / 130mm 130mm.

      +$0.00

      • Cane Creek Helm MK2 Air / 29 / 130mm

    Shock

    • Rockshox Deluxe Select+ / 190x45

      • Rockshox Deluxe Select+ / 190x45

    • Cane Creek DBair IL 190 / 45

      +$139.99

      • Cane Creek DBair IL

  • 3. wheels

    Tubes
    WTB Inner Tube 29 / 1.9-2.3

    Configure your 3. wheels

    Tubes

    • WTB Inner Tube 29 / 1.9-2.3

      • WTB [OEM] Inner Tube

      Never one to be stranded roadside; Prudence states that you should always have a spare at hand even for your faithful tubeless set up, and who are we to argue with Prudence.

    • Tubeless Tyre Upgrade and Setup

      +$54.99

      • Tubeless Tyre Upgrade and Setup

      Go tubeless

  • 4. pedals

    Pedals
    No Pedals

    Configure your 4. pedals

    Pedals

    • No Pedals (none)

      • No Pedals

    • Sonder Torque Black

      +$34.99

      • Sonder Torque

      Pedals: the humble yet essential afterthought that make all that time spent pondering over components worth the pain. Where would we be without them?

      Seriously grippy, reliable, and stable; Torque gives you the confidence to put down the power whatever the weather.

      A light and tough thermoplastic body combined with LSL sealed bearings around a CNC machined Cr-Mo makes Torque the kind of pedal you can depend on to withstand hours of use and abuse.

      Twelve 4 mm replaceable grip pins on each side of the pedal let you customise how much grip you’ll need and boost durability.

    • Sonder Slingshot Black

      +$49.99

      • Sonder Slingshot

      The wide platform Slingshot pedal is designed to provide the support, control and confidence you need for a variety of riding, whether on trail, gravel or road.

      • Wide 87x90 platform made from 6061 aluminium
      • Double-sided adjustable SPD clips
      • Chromoly axle with sealed bearings

      The Slingshot's wide foot platform provides plenty of support to the foot for more comfortable pedalling over long distances, reducing hot-spots. This additional foot support also gives you greater control of the rear end of the bike on tight turns or technical trail.

      If you're using the Slingshot for mountain biking, the pedal's wide surface gives you a platform to stand on unclipped, ready to bail out if needed, on heart rate-quickening sketchy sections.

      With double-sided SPD clips and a large pedal area, the Slingshot is easy to clip in and out of in a hurry. A clipless system provides greater pedalling efficiency when climbing and more control when descending.

    • Shimano M520 Pedal Black

      +$49.99

      • Shimano M520 Pedal

  • 5. accessories

    Bottle cages
    No Bottle Cages
    Lights
    No Lights
    Mudguards
    No Mudguards

    Configure your 5. accessories

    Bottle cages

    • No Bottle Cages (none)

      • No Bottle Cages

    • Sonder Buzz Wire Single

      +$4.99

      • Sonder Buzz Wire [OEM]

      The easiest and most convenient way to carry water on your bike, a classic cage design that holds your water bottle nice and snug.

      Buzz Wire is reassuringly durable, weighs just 65 grams and will carry your 500 or 750 ml water bottle with ease.

      If you are on expedition and looking for a way to pass a rest day make a bent wire loop and challenge someone to a game of Buzz Wire!

    • Sonder Buzz Wire Pair

      +$8.99

      • Sonder Buzz Wire [OEM]

      The easiest and most convenient way to carry water on your bike, a classic cage design that holds your water bottle nice and snug.

      Buzz Wire is reassuringly durable, weighs just 65 grams and will carry your 500 or 750 ml water bottle with ease.

      If you are on expedition and looking for a way to pass a rest day make a bent wire loop and challenge someone to a game of Buzz Wire!

    • Sonder Sideblade Left Entry / Black

      +$5.99

      • Sonder Sideblade

      The Sideblade bottle cage not only gives your water bottle a lovely, secure hug, but its side loading system makes it easier to access when you need a drink, making staying hydrated a joy even when you've got a load of frame bags to work around!

      The Side blade is geared at letting you get to your water when you've got a bike packed up with frame bags, this means that it's also ideal for compact and full-sus frames where a standard loading bottle cage system just won't fit, you can choose which side you'd like to access your bottle by with a twist of the cage in the mount before your ride.

      Made of polycarbonate, the Sideblade is also super light and super duper tough - hooray!

    • Sonder Sideblade PAIR / Black

      +$0.00

      • Sonder Sideblade

      The Sideblade bottle cage not only gives your water bottle a lovely, secure hug, but its side loading system makes it easier to access when you need a drink, making staying hydrated a joy even when you've got a load of frame bags to work around!

      The Side blade is geared at letting you get to your water when you've got a bike packed up with frame bags, this means that it's also ideal for compact and full-sus frames where a standard loading bottle cage system just won't fit, you can choose which side you'd like to access your bottle by with a twist of the cage in the mount before your ride.

      Made of polycarbonate, the Sideblade is also super light and super duper tough - hooray!

    • Sonder Sideblade Right Entry / Black

      +$0.00

      • Sonder Sideblade

      The Sideblade bottle cage not only gives your water bottle a lovely, secure hug, but its side loading system makes it easier to access when you need a drink, making staying hydrated a joy even when you've got a load of frame bags to work around!

      The Side blade is geared at letting you get to your water when you've got a bike packed up with frame bags, this means that it's also ideal for compact and full-sus frames where a standard loading bottle cage system just won't fit, you can choose which side you'd like to access your bottle by with a twist of the cage in the mount before your ride.

      Made of polycarbonate, the Sideblade is also super light and super duper tough - hooray!

    Lights

    • No Lights

      • No Lights
      -

    • Tau Rear

      +$19.99

      • Tau

      Bright enough to blind you when you turn it on so you can be sure that other road users will also see you.

      Tau+ front safety light offers 65 lumens of 270° ultra wide lighting with 10 m beam distance.

      Tau- rear safety light will shed out 20 lumens of 270° ultra wide lighting from the red COB LED strip

      Tau is visible from up to 100 m and is water resistant so they will happily brighten your way even on the gloomiest of days and is impact resistant from 1 m.

      Switch protection prevents any unwanted battery usage and battery capacity indicator will let you know when the juice is running low.

      Only 22g including the USB rechargeable battery and LED lights that never need replacing will keep you light and bright for years to come!

      Each Tau light comes with a bigger and a smaller strap to fit with most bars/seat posts and if you need it even bigger, just lace the bands together to make a larger loop.

    • Exposure Trace Pack Exposure Trace Pack

      +$109.99

      • Exposure Trace Pack

      The Trace MK2 + TraceR DayBright is a lightweight front and rear rechargeable light set for staying safe and visible when commuting and road cycling at night.

      Manufactured in the UK, they both come in an aluminium body with three different brightness settings, six lighting modes, side illumination and seat post and handlebar mounts compatible with multiple different mounts. The Trace MK2 has a 10% power increase on the old model and a traffic light Fuel Gauge so you don’t get caught out.

      The DayBright pulse pattern is specially designed to be more visible in daylight than a regular light pulse, and is visible from over a kilometre away - even in the brightest part of the day.

      The TraceR MK1 DayBright comes with Exposure's Optimised Mode Selector. This allows you to choose a light pattern and brightness that fits your ride type and length, whether it's a quick dash across town or an all-night adventure.

    Mudguards

    • No Mudguards (none)

      • No Mudguards

    • Sonder Fender Front MTB

      +$0.00

      • Sonder Fender

      The Sonder Front Fender protects you from excessive mud splatter on wet, mucky trails. These lightweight plastic mudguards don’t require any special fixings on your bike and can be strapped straight onto your forks with 4 cable ties (supplied).

      Made from durable polypropylene, if the Fender does meet its end, it can be easily recycled by most councils or at your local recycling centres.

Initial Price
$3,149.00
Extras
$0.00
Grand Price
$3,149.00
Go to Checkout
Description

Fast and agile, Cortex is a trail riding, down-country, all terrain mountain bike for seriously epic days out. It comes alive on long technical descents with 120 mm rear travel, big wheels and a stiff responsive frame.

With bang up to date geometry, Cortex is confidence inspiring with a playful character. Stand up and mash on the pedals out of turns, manual sections of trail and pop off tree stumps, rocks and roots. Smash out short and loose technical climbs, flat out descents and tight techy singletrack sections. The harder you push the bigger you grin.

..Read more
  • Fast and agile short travel full sus 29er; perfect for mixed terrain and day long epics
  • Frame: Sonder Cortex 120 mm travel, hand-welded 6061 double butted aluminium
  • Fork: RockShox Pike Ultimate RCT3 / 29 / 130mm
  • Rockshox Deluxe Select+ / 190x45
  • Groupset: SRAM GX Eagle, 1x12, 10-50
  • Brakes: SRAM Guide R
  • Seat Post: X-Fusion Manic Drop Seatpost and Lever / 31.8mm / 125mm
  • Wheelset: Love Mud Hobo 29er Wheelset / XD
  • Up to date geometry for trail bike agility and enduro bike stability

Cortex frameset is hand-welded from 6061 double butted aluminium with a tapered ovalised top-tube and large section down-tube for a stiff chassis with just enough compliance to get you out of trouble. 66 head angle, 74.5 seat tube angle, 40 mm bottom bracket drop and a 465 mm reach (size large). Cortex’s dialed in geometry and 2.6" tyre clearance offers a comfortable and efficient climbing position for big miles and a stable, spirited platform for smashing up descents.

Read less
Features

Up to Date Trail Bike Geometry

Trail bike Agility with Enduro bike stability, the Cortex has a confidence inspiring, stable and forgiving ride.

Metric Shock Standard

Designed around metric shock sizing standard, with lengthened shocks and shorter strokes that increase bushing overlap for more smooth, supple, sensitive and reactive suspension action.​

Horst link suspension design

The tried and tested Horst link suspension design allows the suspension to stay active when braking.​

Tyre Clearance

​Clearance for up to 29 x 2.6in tyres.

Internal Cable Routing

​Internal routing in the front triangle for clean lines.

Build Spec
BuildCortex GX Eagle
Frameset
Frame:Sonder Cortex Frame
Fork:Cane Creek Helm MK2 Air / 29 / 130mm
Shock:Rockshox Deluxe Select+ / 190x45
Headset:Love Mud Rumour / ZS44-ZS56
Seat Clamp:Love Mud Gromit / 34.9mm
Group Set
Brake Front:SRAM Guide R / 950mm
Brake Rear:SRAM Guide R / 1800mm
Rotor Front:Avid Centreline Rotor / 180mm
Rotor Rear:Avid Centreline Rotor / 160mm
Rear Mech:SRAM GX Eagle Rear Derailleur / 12 / Long
Rear Shifter:SRAM GX Eagle Trigger Shifter
Chainset:SRAM GX Eagle Crankset DUB / 170mm / 32
Bottom Bracket:SRAM Bottom Bracket / DUB
Chain:SRAM GX Eagle Chain / 120 Links
Cassette:SRAM XG1275 Eagle Cassette / 12 / 10-50
Finishing Kit
Stem:Love Mud Piskie Stem / 31.8mm / 35mm
Seatpost:X-Fusion Manic Drop Seatpost and Lever / 31.6mm / 125mm
Saddle:Sonder Abode / Black
Tape/Grips:Sonder Clutch / Black
Handlebar:Sonder Aspect Riser
Wheelset
Wheels:Sonder Alpha 29 / XD
Front Tyre:WTB Vigilante / Light High Grip / 29 / 2.5
Rear Tyre:WTB Trail Boss / Tough Fast Rolling / 29 / 2.4
Tubes:WTB Inner Tube / 29 / 1.9-2.3
Weight
Frame:S: 1.97 kg; M: 2.0 kg; L: 2.1 kg; XL: 2.14 kg
Built:S: 12.4 kg; M: 12.65 kg; L: 13.8 kg; XL: 13.9 kg
Pedals not included with full builds
Geometry and Sizing

Sizing

It is important to get the right size bike, if the bike fits it will be faster, more comfortable, and easier to handle. You can also take into consideration the standover height to ensure you pick a bike that will be a good fit. If you measure your inside leg and ensure there is a minimum of an inch from the toptube to your crotch this will give you enough seatpost adjustment to find your optimum saddle height. Generally we recommend:
Small
Riders between 5ft 2in and 5ft 7in
Medium
Riders between 5ft 6in and 5ft 10in
Large
Riders between 5ft 9in and 6ft 2in
X-Large
Riders of 6ft 2in +

Cortex

Size Small Medium Large X-Large
ST - Seat tube 400 425 465 485
TT - Top tube 587 608 636 658
HT - Head tube 100 105 115 125
HA - Head angle 66 66 66 66
SA - Seat angle 74.5 74.5 74.5 74.5
CS - Chainstay 442 445 447 450
BB - BB drop 40 40 40 40
FO - Fork offset 51 51 51 51
WB - Wheelbase 1169 1191 1220 1244
SO - Stand over TBC TBC TBC TBC
RE - Reach 420 440 465 485
SK - Stack 602 606 615 625
Tyre Diameter 755 755 755 755
Fork Axle to Crown 540 540 540 540
Frame Spec
Alloy 29er short travel full suspension trail bike
Weight: S: 2.73kg; M: 2.91kg; L: 3.05kg; XL: 3.11kg
Hydroformed and custom butted alloy frame tubing
Internal cable routing
Rear Shock: Rockshox Deluxe Select+ 190 x 45 mm
Horst link suspension layout
120 mm rear travel; 130 mm fork travel
Clearance for up to 29” x 2.6 in wide tyres
73 mm BSA threaded bracket shell
148 x 12 mm rear thru-axle
31.6mm seat tube, 34.9mm clamp
ZS44/28.6| ZS56/40 headset (frame and rear shock does not come with headset)
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