Sonder Cortex NX Eagle

Sonder Cortex NX Eagle

Short travel 29er full suspension mountian bike

£2,049.00

Fast and agile short travel full sus 29er mountain bike with SRAM NX Eagle, 1x12 groupset, Rockshox Revelation fork and Deluxe rear shock

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All Sonder bikes are built to order and can be customised. Our build time is currently 5 weeks.

You can make your selections on the next page.

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

    • Green

    • Brown

  • 1. components

    Handlebar
    Sonder Aspect Riser 780mm
    Saddle
    Love Mud Abode
    Seatpost
    X-Fusion Manic Drop Seatpost and Lever 31.8mm / 125mm 31.8mm / 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 Love Mud 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.

    • Love Mud Aspect Flat 720mm

      +£0.00

    • Love Mud Aspect Flat

      Flat bars help you keep the front end of your bike low, allowing you to get the weight over your front wheel when climbing and giving you more control in cornering.

      Our flats have a 5˚ rise so technically we should call them flatish, but if you really need them to be totally flat just rotate in the stem clamp!

    Saddle

    • Love Mud Abode

    • Love Mud Abode [OEM]

      High density foam padding over a plastic base provides comfort and longevity. A v-shaped split at the rear of the saddle allows flex as you are riding, increasing shock absorbancy and reducing pressure on the spot between your sit bones.

      Scooped up at the back with a slight rise towards the nose the longitudinal profile provides a cupped, craddled seating position, a timeless, proven design for distance on and off the road or climbing in the mountains.

      Stainless steel rails give 50 mm of forward and back adjustment to help you find your sweet spot.

      All our Sonder bikes come with Abode fitted as standard.

    • Love Mud Kura

      +£19.99

    • Love Mud 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 31.8mm / 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 31.8mm / 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 / 150mm Drop / 31.6 x 440mm

      +£174.99

    • 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.

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

      +£174.99

    • 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.

  • 2. forks

    Forks
    Rockshox Revelation RC 29 / 130mm

    Configure your 2. forks

    Forks

    • Rockshox Revelation RC 29 / 130mm

    • Rockshox Revelation RC
    • RockShox Pike Ultimate RCT3 29er / 130mm

      +£239.99

    • RockShox Pike Ultimate RCT3
  • 3. wheels

    Wheels
    Sonder Nova 29 Wheelset Shimano

    Configure your 3. wheels

    Wheels

    • Sonder Nova 29 Wheelset Shimano

    • Sonder Nova 29 [OEM] Wheelset

      Whether you're navigating rock gardens or tackling steep climbs, Novas will consistently give you a boost when the roads are rough and the terrain is tricky. Machine built for precision on Sonder’s sealed hubs.

      Boost: wider, stiffer, tougher

      Nova's boost hub is wider than a standard hub; extra width between the flanges promotes a shallower spoke bracing angle to create a stronger, stiffer wheel. A wider hub also means a shorter chainstay, more mud clearance, and better tyre clearance.

      Wider rims mean tyres work better

      26mm lightweight aluminium rims make this wheelset ideal for rock gardens and technical terrain – you can run 2.2" - 2.6" tyres, which will plump up really nicely to give a broad contact patch for maximum traction and confidence.

      Built to take abuse

      Novas have sealed bearings that are easily serviceable without the need for specialist tools. Plain-gauge spokes have been chosen to keep the wheels super-strong, whether you’re landing big drops or loading your bike with luggage. And a steel free-hub body will take years of abuse. You could go round the world on these wheels.

      Tubeless Compatible

      The Nova 29's tubeless-ready rims mean you’ll be able to run lower pressures, giving you even better traction and control. 

  • 4. pedals

    Pedals
    No Pedals

    Configure your 4. pedals

    Pedals

    • No Pedals (none)

    • No Pedals
    • Shimano M520 Pedal Black

      +£39.99

    • Shimano M520 Pedal
    • Shimano RS500SL Pedal Black

      +£39.99

    • Shimano RS500SL Pedal
    • Shimano A530 Pedal Black

      +£39.99

    • Shimano A530 Pedal
  • 5. accessories

    Bottle cages
    No Bottle Cages
    Mudguards
    No Mudguards

    Configure your 5. accessories

    Bottle cages

    • No Bottle Cages (none)

    • No Bottle Cages
    • Love Mud Sideblade Left Entry / Black

      +£4.99

    • Love Mud 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!
    • Love Mud Sideblade Right Entry / Black

      +£4.99

    • Love Mud 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!
    • Love Mud Sideblade Pair / Black

      +£8.99

    • Love Mud 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!

    Mudguards

    • No Mudguards (none)

    • No Mudguards
    • Love Mud Fender Reg / Set

      +£4.99

    • Love Mud Fender

      Smashing through puddles and over marshy ground can be great fun, but getting a face full of bog water certainly isn’t. 

      You can avoid a wet face with a Love Mud Front Fender. These lightweight plastic mudguards don’t require any special fixings on your bike and can be strapped straight onto your forks.

      Keep the dirt out your eyes so you can focus on the important things, having a great ride.

      If you don’t have the muddy equivalent of a duck's back then the Love Mud Rear Fender is the perfect product for you.

      If you love blasting down muddy trails but don’t like that wet mucky streak up your back quite as much, then the the Love Mud Rear Fender might be exactly the thing you’re after. This lightweight plastic mud guard keeps splashes and spray off your back and doesn’t need any special fixings to attach to your bike. Simply fitted to your seat post and with a couple of ties under the saddle. You can pop it on your bike with minimal fuss and you’re ready for even the wettest ground.

Initial Price
£2,049.00
Extras
£0.00
Grand Price
£2,049.00
Go to Checkout
Description

Fast and agile, Cortex is for epic days over mixed terrain. 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.

At a Glance
  • 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 Revelation RC / 29 / 130mm
  • Rear Shock: Rockshox Deluxe Select+ / 190x45
  • Groupset: SRAM NX Eagle, 1x12, 11-50
  • Brakes: SRAM Guide T
  • Seat Post: X-Fusion Manic Drop Seatpost and Lever / 31.8mm / 150mm
  • Wheelset: Sonder Nova 29 Wheelset / Shimano
  • 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.

Kudos
Bike Radar Reviews Sonder Cortex

Bike Radar have their eyes set on the new Sonder Cortex

"Sonder has added to its bicycle range with the Cortex trail bike — a 120mm travel full suspension 29er that starts at £1,500 and is designed, it seems, to do just about anything."

Read the full review here.

Guy Kesteven at Bike Perfect Reviews the Sonder Cortex

We handed the Cortex over to Guy Kesteven for some real trail testing.

Cortex is a light, well-shaped frame that balances instant familiarity with extra confidence on faster, rowdier trails. Add an easy to set up fork, decent stop, go and finishing kit rolling on sturdy wheels with a properly surefooted front tyre and you’ve got a great package for the price. 

Read the full review here.

Sonder Cortex: Singletrack First Ride Review

Andi at Singletrack gets an exclusive first ride review of the latest 120mm travel full-suspension bike from Sonder. Meet the 2020 Sonder Cortex.

"While riding the Sonder it felt just as fast as my big bike but sharper to corner, easier to hop and overall a hell of a lot of fun to ride, and I cannot wait to get on it again."

Read the full first ride review over on Singletrack.

Author: Andi Sykes
Reviews
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
Build Spec
Build Cortex NX Eagle Recon
Frameset
Frame: Sonder Cortex Frame
Fork: Rockshox Revelation RC / 29 / 130mm
Rear Shock: Rockshox Deluxe Select+ / 190x45
Headset: Love Mud Rumour / ZS44/ZS56
Seat Clamp: Love Mud Gromit / 34.9mm
Group Set
Brake Front: SRAM Guide T / 950mm
Brake Rear: SRAM Guide T / 1800mm
Rotor Front: Avid Centreline Rotor / 180mm
Rotor Rear: Avid Centreline Rotor / 160mm
Rear Mech: SRAM NX Eagle Rear Derailleur / 12 / Long
Rear Shifter: SRAM NX Eagle Trigger Shifter
Chainset: SRAM NX Eagle Crankset DUB / 170mm / 32
Bottom Bracket: SRAM Bottom Bracket / DUB
Chain: SRAM NX Eagle Chain / 118 Links
Finishing Kit
Stem: Love Mud Piskie Stem / 31.8mm / 45mm
Seatpost: X-Fusion Manic Drop Seatpost and Lever / 31.8mm / 150mm
Saddle: Love Mud Abode / Black
Tape/Grips: Love Mud Clutch / Black
Handlebar: Love Mud Aspect Riser
Wheelset
Wheels: Sonder Nova 29 Wheelset / Shimano
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: 2.73kg; M: 2.91kg; L: 3.05kg; XL: 3.11kg
Built: S: 13.9kg; M: 14.1kg; L: 14.3kg; XL: 14.5kg
Pedals not included with full builds
FAQs
TBC
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)
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.