Sonder Cortex GX Eagle

Sonder Cortex GX Eagle

Short travel 29er full suspension mountian bike

£2,499.00

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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All Sonder bikes can be customised.
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

  • Finishing kit

    Stem
    31.8mm / 35mm
    Handlebars
    Love Mud Aspect Riser 780mm
    Saddle
    Love Mud Abode Black
    Stem
    Love Mud Piskie Stem 31.8mm / 35mm

    Configure your Finishing kit

    Stem

    • Love Mud Piskie Stem 31.8mm / 45mm

      +£0.00

    • Love Mud Piskie Stem [OEM]
    • Love Mud Piskie Stem 31.8mm / 55mm

      +£0.00

    • Love Mud Piskie Stem [OEM]

    Handlebars

    • Love Mud Aspect Riser 780mm

    • Love Mud Aspect Riser [OEM]
    • Love Mud Confucius 760mm

      +£14.99

    • Love Mud 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 offroad 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. Need some bar tape? Add a couple of rolls of Love Mud Reels for better comfort and grip.

      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.

    • 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 Black

    • Love Mud Abode [OEM]
    • Love Mud Kura Black

      +£33.99

    • 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.

    Stem

    • Love Mud Piskie Stem 31.8mm / 35mm

    • Love Mud Piskie Stem [OEM]
    • Love Mud Piskie Stem 31.8mm / 45mm

    • Love Mud Piskie Stem [OEM]
    • Love Mud Piskie Stem 31.8mm / 55mm

    • Love Mud Piskie Stem [OEM]
  • Accessories

    Bottle cages
    No Bottle Cages
    Pedals
    No Pedals

    Configure your Accessories

    Bottle cages

    • No Bottle Cages

    • No Bottle Cages
    • Love Mud Buzz Wire Black

      +£3.99

    • Love Mud Buzz Wire

      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!

    Pedals

    • No Pedals

    • No Pedals
    • Love Mud Torque Black

      +£25.99

    • Love Mud 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.

    • Love Mud Jekyll Black

      +£44.99

    • Love Mud Jekyll

      Jekyll is two faced; SPD's and flats all in one, multi-purpose mtb touring pedals.

      Jekyll gives you the freedom to ride with normal shoes or with cleats. Jekyll combines a single sided SPD mechanism with a flat pedal body with grip pins on the other. They are ideal for riders who switch frequently from the daily commute to nipping down to the local shop for a pint of milk in their loafers.

      The flat side has 8 replaceable grip pins, 4 mm long, they provide grip in all conditions. When you are ready to get your power on the cleats are just a half rotation away - no swapping your pedals out.

      Jekyll also comes provided with Love Mud 'SH-51 style' cleats.

  • Suspension

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

    Configure your Suspension

    Fork

    • RockShox Pike Ultimate RCT3 29er / 130mm

    • RockShox Pike Ultimate RCT3
    • Cane Creek Helm-Air 29er / 130mm / Gunmetal Grey

      +£149.00

    • Cane Creek Helm-Air

    Shock

    • Rockshox Deluxe Select+ / 190x45

    • Rockshox Deluxe Select+ / 190x45
    • Cane Creek DBair IL 190 / 45

      +£149.99

    • Cane Creek DBair IL
Initial Price
£2,499.00
Extras
£0.00
Grand Price
£2,499.00
Go to Checkout
Description

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

Hand-welded from 6061 double butted aluminium frame for epic days over mixed terrain.

  • 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.

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 GX Eagle Revelation
Frameset
Frame: Sonder Cortex Frame
Fork: RockShox Pike Ultimate RCT3 / 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 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 / 45mm
Seatpost: X-Fusion Manic Drop Seatpost and Lever / 31.8mm / 125mm
Saddle: Love Mud Abode / Black
Tape/Grips: Love Mud Clutch / Black
Handlebar: Love Mud Aspect Riser
Wheelset
Wheels: Love Mud Hobo 29er Wheelset / 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: TBC; M: TBC; L: TBC; XL: TBC
Built: S: TBC; M: TBC; L: TBC; XL: TBC
Pedals not included with full builds
FAQs
TBC
Frame Spec
Alloy 29er short travel full suspension trail bike
Weight (kg): S: 2.73; M: 2.91; L: 3.05; XL: 3.11
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.