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Sonder Sonder Cortex
  • Cortex GX Transmission in Storm Blue
  • Cortex GX Eagle Transmission
  • Cortex SLX in Mint
    • Top Spec

    Sonder Cortex

    Cortex GX Eagle TransmissionMid travel 29er

    €3.449 €4.399

    Fast and agile mid travel full sus 29er mountain bike with Sram GX Eagle Transmission 1x12 wireless groupset, Rockshox Pike fork and Deluxe rear shock
    Built to Order. Be Riding Next Week

    1

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    • Size
      Please select an available size
    • Colour
      • Cortex Frame [V2]
      • Cortex Frame [V2]
      Please select an available colour
    • Size:

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    Fast and agile, Cortex is a mid-travel full suspension trail bike for big mountain epics on all terrain and flying round your local trail centre. It comes alive on long technical descents with 140mm travel up front and 135mm at the rear, big wheels and a stiff, responsive frame.



    With bang up to date geometry, Cortex inspires confidence 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 your grin.

    The tried and tested Horst link design keeps the suspension active when braking. We've fine tuned the leverage curve and worked with SRAM RockShox to produce a rear shock that's custom-tuned for the Cortex - maximum downhill performance while maintaining the all-day pedalling efficiency from its predecessor. Cortex is your do-it-all bike of choice for lakeland 30-milers and flat-out trail centre laps alike; with enough travel to carry speed over longer sections of rough ground and a lively, playful feel through the twisty bits.

    Cortex' frameset is hand-welded from 6061 double-butted aluminium for the perfect mix of weight, rigidity and durability; with a slim hydroformed top-tube and down-tube designed to improve stiffness with just enough compliance to get you out of trouble. Internal cable and stealth dropper routing means clean lines, dampened with foam liners for a quiet ride. Dialed-in geometry and 2.4” tyre clearance gives heaps of grip; a comfortable and efficient climbing position for big days in the saddle; and a stable, spirited platform for smashing down descents.

    Why GX Eagle Transmission

    GX Eagle Transmission is ready to go toe to toe with anything, perfect shifting that’s unapologetically robust. It’s simply the most dependable drivetrain we’ve ever created, built to hold its own on any trail and outlast the rest, even with the added power of a motor. GX Eagle Transmission is even rebuildable to keep working season after season. Forget the old excuses, this is the new people’s champion for all-in, all-day rides.

    Features

    Up to date trail bike geometry

    Trail bike agility with Enduro bike stability, the Cortex has a confidence inspiring, stable and responsive ride.

    Increased chainstay length for the Large and XL frames maintains consistent weight distribution for riders of all heights.

    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. We've worked with SRAM to produce a rear shock that's specifically tuned for the Cortex - and made sure those benefits are felt across a wider range of rider size and weight.

    140mm travel at the front and 135mm at the rear lets you carry higher speeds over rough ground without sacrificing pedalling efficiency.

    Horst link suspension design

    The tried and tested Horst Link suspension design allows the suspension to stay active when braking. We've fine-tuned the suspension leverage curve to maximise performance on the downhill while maintaining efficient uphill pedalling - so no need for climb switches.

    Internal cable routing

    Internal routing in the front triangle makes for clean lines and tidy cables, with dampened foam liners for a quiet ride.

    Universal Derailleur Hanger UDH

    Keeping up with industry standards, Cortex uses a UDH hanger. They're widely available so you can get rolling again sooner after any mid-ride mishaps!

    The UDH also makes Cortex compatible with the latest SRAM Transmission groupsets.

    Build Spec
    Frameset
    Frame:Cortex Frame | 6061-T6 Aluminium, Heat-Treated
    Fork:RockShox Pike | 140mm (travel)
    Shock:RockShox Deluxe Select | 210 x 50
    Headset:FSA Orbit N0.57E
    Groupset
    Shifters:SRAM AXS POD Shifter
    Brakes:SRAM Motive Bronze Brake | Hydraulic | Post Mount
    Rotors:SRAM Centerline | 180mm (front & rear) | 6-bolt
    Rear derailleur:SRAM GX Eagle Transmission | Rear Derailleur
    Chainset:SRAM GX Eagle T-Type Chainset | 1 Guard| 165mm | 32t
    Cassette:SRAM XS1275 Cassette| 10-52t
    Chain:SRAM GX Eagle Transmission Flat Top Chain | 12 Speed
    Bottom bracket:SRAM DUB Wide | BSA | 73mm
    Wheelset
    Wheels:Sonder Alpha 29" UK Made
    Tyres:Schwalbe Hans Dampf Super Trail Evo TLE | 29x2.35 | Black
    Tubes:Nutrak Inner Tube
    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: TBC M: TBC L: TBC XL: TBC
    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

    SizeSmallMediumLargeX-Large
    Rider Height

    5ft 2in - 5ft 7in 

    (158-173cm)

    5ft 6in - 5ft 10in

    (170-177cm)

    5ft 9in - 6ft 2in

    (175-187cm)

    6ft 2in + 

    (187cm +)

    ST - Seat tube400410440460
    ETT - Estimated top tube576597625647
    HT - Head tube100105115125
    HA - Head angle65656565
    AC - Axle to crown550550550550
    SA - Seat angle75.675.675.675.6
    CS - Chainstay440440445445
    BB - BB drop40404040
    FO - Fork offset44444444
    WB - Wheelbase1173119512291253
    RE - Reach420440465485
    SK - Stack608614624633
    Frame Spec
    Weight: S: TBCkg; M: TBCkg; L: TBCkg; XL: TBCkg (plus shock 0.4kg)
    Hydroformed and custom butted alloy frame tubing
    Internal cable routing
    Rear Shock: 210x50mm metric shock – Custom tuned for the frame
    Horst link suspension layout
    135mm rear travel; 140mm fork travel
    Frame clearance for up to 29 x 2.4" wide tyres
    BSA BB with ISCG-05 chain guide tabs
    UDH Boost 148 x 12mm rear thru-axle
    31.6mm seat tube, 34.9mm clamp
    Headset: ZS44/28.6 top, ZS56/40 bottom

    Your actual build date will depend on additional components you specify and from receipt of full payment. For any queries contact our Sonder team on +44 1773 417006.

    • Cortex GX Transmission in Storm Blue
    • Cortex GX Eagle Transmission
    • Cortex SLX in Mint