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  • Cortex / Medium
  • Cortex / Medium
  • Cortex / Medium
  • Cortex / Medium
  • Cortex / Medium
  • Cortex / Medium
    show more
    • Cortex / Medium
    • Cortex / Medium
    • Cortex / Medium
    • Cortex / Medium
    • Cortex / Medium
    • Cortex / Medium

    Cortex / Medium


    This is an Ex Demo bike based at our store in Ilkley. For more info please call our Metrocentre Sonder bike expert on Tel: 0191 603 0939.

      Pre-order now for despatch from . We'll keep you up-to-date with your order progress and despatch as soon as it is available.

      • Free Delivery over £50

      • Free Returns

      V12 Interest Free Finance

      At a glance

      • Shimano Deore M6100 12-speed groupset
      • Rockshox Recon Silver RL fork
      • Rockshox Deluxe Select+ shock
      • Sonder Nova 29" Uk made wheelset

      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.

      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.


      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


      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)


      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: 2.73kg; M: 2.91kg; L: 3.05kg; XL: 3.11kg
      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
      ZS44/28.6| ZS56/40 headset (frame and rear shock does not come with headset)