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    • Buy Now

    Cortex XT

    Short travel 29er

    £2,999

    or from £52 /month V12 logo

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    2

    Customize

    3

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    Reset

    Fast and agile short travel full suspension 29er mountain bike with Shimano XT 1x12 groupset, Rockshox Pike Ultimate fork and Deluxe Select+ rear shock
    Buy Now. Deliveries from 23 February.

    1

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    • 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 scope handlebars
    Sonder Scope Handlebar 760mm

    +£39.99 +£32.49

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

    +£99.99 +£79.99

    Saddle

    Sonder Abode [OEM]
    Sonder Abode Black / 138

    +£0.00

    Sonder Zone [OEM]
    Sonder Zone 152 / Black

    +£34.99 +£29.99

    Sonder Kura [OEM]
    Sonder Kura

    +£47.99 +£39.99

    Seatpost

    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 / 125mm Drop / 31.6 x 390mm
    RockShox Reverb / 125mm Drop / 31.6 x 390mm 1

    +£0.00

    RockShox Reverb / 150mm Drop / 31.6 x 440mm
    RockShox Reverb / 150mm Drop / 31.6 x 440mm 1

    +£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

    +£44.99 +£39.99

    sonder talo bike stem
    Sonder Talo 45mm

    +£44.99 +£39.99

    Forks

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

    +£0.00

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

    +£149.99

    Shock

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

    +£0.00

    Cane Creek DBair IL
    Cane Creek DBair IL 190 / 45

    +£119.99

    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

    +£44.99

      3

      Select Accessories

      Edit

      Bottle Cages

      No Bottle Cages
      No Bottle Cages (none)

      +£0.00

      Sonder Buzz Wire
      Sonder Buzz Wire Single

      +£5.49 +£4.99

      Sonder Buzz Wire
      Sonder Buzz Wire Pair

      +£10.99 +£8.99

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

      +£6.99 +£5.99

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

      +£9.99 +£7.99

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

      +£6.99 +£5.99

      Sonder Blade
      Sonder Blade Black

      +£17.99 +£14.99

      Sonder Blade
      Sonder Blade Black / Pair

      +£29.99 +£24.99

      Ti Wire Bottle Cage
      Ti Wire Bottle Cage Single

      +£44.99 +£39.99

      Ti Wire Bottle Cage
      Ti Wire Bottle Cage Pair

      +£79.99 +£64.99

      Lights

      No Lights
      No Lights (none)

      +£0.00

      Tau
      Tau Front

      +£16.99 +£14.99

      Phase 550
      Phase 550

      +£24.99 +£19.99

      Phase 850
      Phase 850

      +£34.99 +£29.99

      Ariel
      Ariel

      +£44.99 +£39.99

      Lights Accessories

      No Bike Light Accessories
      No Bike Light Accessories (none)

      +£0.00

      alpkit helmet mount bike light gps
      Helmet Mount Black

      +£7.99 +£6.99

      alpkit cockpit bike light gps mount
      Garmin Outfront Mount / Black

      +£24.99 +£19.99

      Mudguards

      No Mudguards
      No Mudguards (none)

      +£0.00

      sonder fender
      Sonder Fender Front MTB

      +£6.99 +£5.99

      Pedals

      No Pedals
      No Pedals (none)

      +£0.00

      Sonder Torque
      Sonder Torque Black

      +£39.99 +£34.99

      reko clipless bike pedal
      Sonder Reko

      +£59.99 +£49.99

      distortion flat mountain bike pedal
      Sonder Distortion

      +£69.99 +£59.99

      sonder slingshot clipless pedal
      Sonder Slingshot Black

      +£79.99 +£64.99

        Initial Price

        Cortex XT / Select a frame...
        £2,999.00

        Extras

        £0.00

        Total Price

        £2,999.00
        Buy Now. Deliveries from 23 February.

        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 XT M8100 12-speed groupset
        • Rockshox Pike Ultimate fork
        • Rockshox Deluxe Select+ shock
        • Sonder Alpha 29" 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 XT?

        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.

        Build Spec
        Frameset
        Frame:Cortex Frame | 6061 aluminium
        Fork:RockShox Pike Ultimate | 130mm (travel)
        Shock:RockShox Deluxe Select+ | 190 x 45
        Headset:FSA Orbit C-40-ACB
        Groupset
        Shifters:Shimano XT M8100 | 1x | 12-speed
        Brakes:Shimano XT M8120 | Hydraulic | Post mount
        Rotors:Shimano RT66 | 180mm (front), 160mm (rear) | 6-bolt
        Rear derailleur:Shimano XT M8100 | Long cage | 12-speed
        Chainset:Shimano XT M8100 | 170mm | 32t
        Cassette:Shimano XT M8100 | 10-51t | 12-speed
        Chain:Shimano SLX | 12-speed
        Bottom bracket:Shimano MT800 | BSA
        Wheelset
        Wheels:Sonder Alpha 29" UK Made
        Front tyre:Goodyear Newton MTF Trail Tubeless | 29 x 2.5" | Black
        Rear tyre:Goodyear Newton MTR Trail Tubeless | 29 x 2.4" | Black
        Tubes:WTB | 29 x 2.4-2.8"
        Finishing kit
        Handlebars:Sonder Aspect Riser | 780mm
        Stem:Sonder Piskie
        Seatpost:X-Fusion Manic | 31.6mm
        Saddle:Sonder Abode
        Grips:Sonder Clutch | Black
        Weight
        Frame:S: 2.8; M: 2.9; L: 3; XL: 3.1;
        Build:S: TBC M: TBC L: TBC XL: TBC
        Pedals not included with full builds
        Specifications are subject to change without notice
        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 (157-170cm)
        Medium: Riders between 5ft 6in and 5ft 10in (167-177cm)
        Large: Riders between 5ft 9in and 6ft 2in (175-187cm)
        X-Large: Riders of 6ft 2in + (187cm)

        Transmitter

        Size Small Medium Large X-Large
        ST - Seat tube 405 425 465 485
        TT - Top tube 575.6 597.3 625.6 649
        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 445 445 445 445
        BB - BB drop 52 52 52 52
        FO - Fork offset 46 46 46 46
        WB - Wheelbase 1169.1 1191.2 1220.2 1244.3
        SO - Stand over 749.7 768.4 782.6 796.6
        RE - Reach 420 440 465 485
        SK - Stack 601.7 606.3 615.4 624.6
        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 in khaki gx axs pike
        • sonder cortex in battleship grey gx axs pike
        • brown
        • crayon
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