• sonder cortex six in khaki
  • Cortex SLX
  • Cortex SLX
  • Cortex SLX

    • SALE

    Cortex SLX

    Short travel 29er

    $2,749 $3,199

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    Fast and agile short travel full suspension 29er mountain bike with Shimano SLX 1x12 groupset, RockShox Revelation RC fork and Deluxe Select+ rear shock
    Buy Now. Be Riding in 10 days.

    1

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    Edit

    • Size
    • Colour

    • Size:

    • Colour:

    2

    Customize

    Edit

    Every Sonder bike is built to order so tell us exactly how you want it. Make any changes you want from the standard build and when you're done, just hit “Add to Bag” at the bottom of the page.

    Handlebar

    Sonder Aspect Riser [OEM]
    Sonder Aspect Riser 780mm

    +$0.00

    Sonder Aspect Riser [OEM]
    Sonder Aspect Riser 780mm

    +$0.00

    sonder aspect carbon flat handlebar flatbar
    Sonder Aspect Carbon Riser 780mm

    +$129.99 +$99.99

    sonder scope handlebars
    Sonder Scope Handlebar 760mm

    +$54.99 +$42.49

    Saddle

    Sonder Abode [OEM]
    Sonder Abode Black / 138

    +$0.00

    Sonder Abode [OEM]
    Sonder Abode Black / 158

    +$0.00

    Sonder Kura [OEM]
    Sonder Kura

    +$49.99

    Sonder Zone [OEM]
    Sonder Zone 133 / Black

    +$49.99 +$37.49

    Sonder Zone [OEM]
    Sonder Zone 152 / Black

    +$49.99 +$37.49

    Brooks B17 Saddle
    Brooks B17 Saddle Standard / Black

    +$179.99 +$137.49

    Brooks B17 Saddle
    Brooks B17 Saddle Standard / Black

    +$0.00

    Brooks Cambium C17 Saddle [OEM] / All Weather / Black
    Brooks Cambium C17 Saddle / All Weather / Black

    +$149.99 +$117.49

    Seatpost

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

    +$149.99

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

    +$149.99

    X-Fusion Manic Drop Seatpost and Lever
    X-Fusion Manic Drop Seatpost and Lever 31.6mm / 170mm

    +$149.99

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

    +$0.00

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

    +$0.00

    X-Fusion Manic Drop Seatpost and Lever
    X-Fusion Manic Drop Seatpost and Lever 31.6mm / 170mm

    +$0.00

    RockShox Reverb / 175mm Drop / 31.6 x 440mm
    RockShox Reverb / 175mm Drop / 31.6 x 440mm Default Title

    +$0.00

    RockShox Reverb / 150mm Drop / 31.6 x 440mm
    RockShox Reverb / 150mm Drop / 31.6 x 440mm Default Title

    +$0.00

    RockShox Reverb / 125mm Drop / 31.6 x 390mm
    RockShox Reverb / 125mm Drop / 31.6 x 390mm Default Title

    +$0.00

    Stem

    Sonder Piskie [OEM]
    Sonder Piskie 31.8mm / 35mm

    +$0.00

    Sonder Piskie [OEM]
    Sonder Piskie 31.8mm / 45mm

    +$0.00

    Sonder Piskie [OEM]
    Sonder Piskie 31.8mm / 55mm

    +$0.00

    sonder talo bike stem
    Sonder Talo 35

    +$59.99 +$47.49

    sonder talo bike stem
    Sonder Talo 45mm

    +$59.99 +$47.49

    Forks

    Rockshox Revelation RC / 29 / 130mm
    Rockshox Revelation RC / 29 / 130mm 29 / 130mm

    +$0.00

    Rockshox Revelation RC / 29 / 130mm
    Rockshox Revelation RC / 29 / 130mm 29 / 130mm

    +$0.00

    Rockshox Revelation RC / 29 / 130mm
    Rockshox Revelation RC / 29 / 130mm 27.5 / 150mm

    +$212.49

    Rockshox Revelation RC / 29 / 130mm
    Rockshox Revelation RC / 29 / 130mm 27.5 / 150mm

    +$0.00

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

    +$499.99

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

    +$749.00

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

    +$949.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 130mm / 29

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 130mm / 29

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 130mm / 29

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 150mm / 27.5

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 150mm / 27.5

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 150mm / 27.5

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 130mm / 29er

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 150mm / 27.5

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 130mm / 29er

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 150mm / 27.5

    +$0.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 29er / 130mm

    +$499.99

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 27.5 / 150mm

    +$269.99

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 29er / 130mm

    +$699.00

    RockShox Pike Ultimate RCT3
    RockShox Pike Ultimate RCT3 27.5 / 150mm

    +$487.49

    Shock

    Rockshox Deluxe Select+ / 190x45
    Rockshox Deluxe Select+ / 190x45

    +$0.00

    Cane Creek Kitsuma Air / 210 / 55
    Cane Creek Kitsuma Air / 210 / 55

    +$312.49

    Cane Creek DBair IL
    Cane Creek DBair IL 190 / 45

    +$149.99

    Cane Creek DBair IL
    Cane Creek DBair IL 210 / 55

    +$149.99

    Tubes

    WTB [OEM] Inner Tube / 29 / 2.4 - 2.8
    WTB Inner Tube / 29 / 2.4 - 2.8 Black

    +$0.00

    Tubeless Tyre Upgrade and Setup
    Tubeless Tyre Upgrade and Setup

    +$59.99 +$57.49

    Wheels

    Sonder Nova 29 [OEM] Wheelset / UK Build
    Sonder Nova 29 Wheelset / UK Build HG

    +$0.00

    Sonder Nova 29 [OEM] Wheelset / UK Build
    Sonder Nova 29 Wheelset / UK Build Microspline

    +$0.00

    Sonder Nova 29 [OEM] Wheelset / UK Build
    Sonder Nova 29 Wheelset / UK Build XD

    +$0.00

    Sonder Alpha 29 [OEM] Wheelset / UK Build
    Sonder Alpha 29 Wheelset / UK Build HG

    +$212.49

    Sonder Alpha 29 [OEM] Wheelset / UK Build
    Sonder Alpha 29 Wheelset / UK Build Microspline

    +$212.49

    Sonder Alpha 29 [OEM] Wheelset / UK Build
    Sonder Alpha 29 Wheelset / UK Build XD

    +$212.49

    Sonder Alpha 29 [OEM] Wheelset / UK Build
    Sonder Alpha 29 Wheelset / UK Build Microspline

    +$0.00

    Sonder Alpha 29 [OEM] Wheelset / UK Build
    Sonder Alpha 29 Wheelset / UK Build XD

    +$0.00

    Sonder Alpha 29 [OEM] Wheelset / UK Build
    Sonder Alpha 29 Wheelset / UK Build HG

    +$0.00

      3

      Select Accessories

      Edit

      Bottle Cages

      No Bottle Cages
      No Bottle Cages (none)

      +$0.00

      love mud side blade side loading bottle cage left
      Sonder Sideblade Black / Left Entry

      +$0.00

      love mud side blade side loading bottle cage left and right
      Sonder Sideblade Black / PAIR

      +$0.00

      love mud side blade side loading bottle cage right
      Sonder Sideblade Black / Right Entry

      +$0.00

      Sonder Buzz Wire
      Sonder Buzz Wire Single

      +$7.99 +$6.99

      Sonder Buzz Wire
      Sonder Buzz Wire Pair

      +$14.99 +$12.49

      Sonder Blade
      Sonder Blade Black

      +$24.99 +$19.99

      Sonder Blade
      Sonder Blade Black / Pair

      +$39.99 +$32.49

      Ti Wire Bottle Cage
      Ti Wire Bottle Cage Single

      +$59.99 +$47.49

      Ti Wire Bottle Cage
      Ti Wire Bottle Cage Pair

      +$109.99 +$84.99

      Lights

      No Lights
      No Lights (none)

      +$0.00

      Tau
      Tau Front

      +$22.49 +$19.99

      Phase 550
      Phase 550

      +$34.99 +$24.99

      Phase 850
      Phase 850

      +$49.99 +$37.49

      Lights Accessories

      No Bike Light Accessories
      No Bike Light Accessories (none)

      +$0.00

      alpkit helmet mount bike light gps
      Helmet Mount Black

      +$12.49 +$8.99

      alpkit cockpit bike light gps mount
      Garmin Outfront Mount / Black

      +$34.99 +$24.99

      Mudguards

      No Mudguards
      No Mudguards (none)

      +$0.00

      sonder defender mudguards pair
      Sonder Defender Mudguards 45mm

      +$0.00

      sonder defender mudguards pair
      Sonder Defender Mudguards 55mm

      +$0.00

      SKS Raceblade Pro XL
      SKS Raceblade Pro XL Black

      +$0.00

      sonder fender
      Sonder Fender Front MTB

      +$9.99 +$7.99

      SKS Commuter Mudguard Set
      SKS Commuter Mudguard Set 28 / 45mm / Black

      +$44.99 +$34.99

      Pedals

      No Pedals
      No Pedals (none)

      +$0.00

      Sonder Torque
      Sonder Torque Black

      +$54.99 +$42.49

      reko clipless bike pedal
      Sonder Reko

      +$69.99 +$49.99

      contact clipless road bike pedal
      Sonder Contact

      +$74.99 +$57.49

      distortion flat mountain bike pedal
      Sonder Distortion

      +$84.99 +$64.99

      sonder slingshot clipless pedal
      Sonder Slingshot Black

      +$109.99 +$84.99

      sonder Jekyll clipless and flat hybrid pedal
      Sonder Jekyll Black

      +$109.99 +$84.99

        Initial Price

        Cortex SLX / Select a frame...
        $2,749.00

        Extras

        $0.00

        Total Price

        $2,749.00
        Buy Now. Be Riding in 10 days.

        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.

        At a glance

        • Shimano SLX M7100 12-speed groupset
        • RockShox Revelation RC fork
        • Rockshox Deluxe Select+ shock
        • Sonder Nova 29" UK made wheelset

        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.

        Why SLX?

        Shimano drivetrains are designed, engineered and manufactured to work as complete drivetrain systems. Shimano's new microspline hub means that you can run a 10 tooth cassette for a huge gear range. The new EV shifters and brakes provide loads of adjustment to get the perfect position as well as a rock-solid feel on the bars. And the 4-pot brakes provide consistent and reliable stopping power.

        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.

        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: 2.8kg; M: 2.9kg; L: 3.0kg; XL: 3.08kg (without shock)
        Hydroformed and custom butted alloy frame tubing
        Internal cable routing
        Rear Shock: Rockshox Deluxe Select+ 190 x 45mm
        Horst link suspension layout
        120mm rear travel; 130mm fork travel
        Clearance for up to 29 x 2.6" wide tyres
        73mm BSA threaded bracket shell
        148 x 12mm rear thru-axle
        31.6mm seat tube, 34.9mm clamp
        Headset: IS42/28.6 | IS52/40

        • sonder cortex six in khaki
        • Cortex SLX
        • Cortex SLX
        • Cortex SLX