• sonder cortex in khaki gx axs pike
  • sonder cortex in battleship grey gx axs pike
  • Sonder Cortex SX Eagle Recon Full Suspension 29er Brown
  • Sonder Cortex SX Eagle Recon Full Suspension 29er Crayon

    • Last chance to buy

    Cortex SX Eagle

    Short travel 29er

    £1,449 (19% Off) £1,799

    or from £25 /month V12 logo

    1

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    2

    Customize

    3

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    Reset

    Fast and agile short travel full suspension 29er mountain bike with SRAM SX Eagle 1x12 groupset, Rockshox Recon Silver RL fork and Deluxe Select+ rear shock.
    Buy now. In stock for same day despatch.

    Need help choosing a bike or technical advice?

    • Open a Live Chat
    • Pop into a store 7 days a week
    • Call a Sonder Customer Hero on 01773 417006
    • Email us at support@alpkit.com
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    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

    +£79.99 +£49.99

    sonder scope handlebars
    Sonder Scope Handlebar 760mm

    +£39.99 +£32.49

    Saddle

    Sonder Abode [OEM]
    Sonder Abode Black / 138

    +£0.00

    Sonder Abode [OEM]
    Sonder Abode Black / 158

    +£0.00

    Sonder Zone [OEM]
    Sonder Zone 133 / Black

    +£34.99 +£29.99

    Sonder Zone [OEM]
    Sonder Zone 152 / Black

    +£34.99 +£29.99

    Sonder Kura [OEM]
    Sonder Kura

    +£47.99 +£39.99

    Brooks B17 Saddle [OEM] / Black
    Brooks B17 Saddle / Black Black

    +£134.99 +£109.99

    Seatpost

    Sonder Seatpost [OEM] 27.2
    Sonder Seatpost 27.2 400mm

    +£0.00

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

    +£119.99

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

    +£119.99

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

    +£119.99

    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 +£37.49

    sonder talo bike stem
    Sonder Talo 45mm

    +£44.99 +£37.49

    Forks

    Rockshox Recon RL Silver / 100mm / 29
    Rockshox Recon RL Silver / 100mm / 29 130mm / 29er

    +£0.00

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

    +£299.99

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

    +£549.99

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

    +£749.99

    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

    Wheels

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

    +£0.00

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

    +£329.99 +£169.99

      3

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      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 +£37.49

      Ti Wire Bottle Cage
      Ti Wire Bottle Cage Pair

      +£79.99 +£64.99

      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

      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 +£32.49

      reko clipless bike pedal
      Sonder Reko

      +£49.99 +£39.99

      distortion flat mountain bike pedal
      Sonder Distortion

      +£59.99 +£49.99

      sonder slingshot clipless pedal
      Sonder Slingshot Black

      +£79.99 +£64.99

        Initial Price

        Cortex SX Eagle / Select a frame...
        £1,449.00

        Extras

        £0.00

        Total Price

        £1,449.00
        Buy now. In stock for same day despatch.

        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

        • SRAM SX Eagle 12-speed groupset
        • Rockshox Recon Silver RL 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 SX?

        SRAM Eagle drivetrains are designed, engineered and manufactured to work as complete drivetrain systems. Its 1x drivetrain is a solution that is built to be lightweight, strong and intuitive, with the gear range to ride on any terrain. SX Eagle provides the same Eagle performance benefits as NX Eagle, but at a lower price point. The main differences stem from the choice of materials and finish options, but functionally SX is fully compatible with SRAMs Eagle groupset.

        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 Recon Silver RL | 130mm (travel)
        Shock:RockShox Deluxe Select+ | 190 x 45
        Headset:FSA Orbit C-40-ACB
        Groupset
        Shifters:SRAM SX Eagle Trigger | 1x | 12-speed
        Brakes:SRAM Level | Hydraulic | post mount
        Rotors:SRAM Centerline | 180mm (front), 160mm (rear) | 6-bolt
        Rear derailleur:SRAM SX Eagle | Long cage | 12-speed
        Chainset:SRAM SX Eagle | 170mm | 32t
        Cassette:SRAM PG1210 | 11-50t | 12-speed
        Chain:SRAM NX Eagle | 12-speed
        Bottom bracket:SRAM PowerSpline | 73mm | 118mm
        Wheelset
        Wheels:Sonder Nova 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:Sonder Seatpost | 31.6mm
        Saddle:Sonder Abode
        Grips:Sonder Clutch | Black
        Weight
        Frame:S: 2.8kg; M: 2.9kg; L: 3kg; XL: 3.1kg;
        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 40 40 40 40
        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
        • Sonder Cortex SX Eagle Recon Full Suspension 29er Brown
        • Sonder Cortex SX Eagle Recon Full Suspension 29er Crayon