Ex-Display Cortex NX Eagle - Large

Short travel 29er full suspension mountian bike


Ex-display fast and agile short travel full sus 29er mountain bike with SRAM NX Eagle, 1x12 groupset, Rockshox Revelation fork and Deluxe rear shock

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This Cortex is a lightly used ex-display bike with a scratch on the forks and a chip on the DS seatstay. See the photos.

Fast and agile, Cortex is for epic days over mixed terrain. 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

Fast and agile short travel full sus 29er; perfect for mixed terrain and day long epics
Frame: Sonder Cortex 120 mm travel, hand-welded 6061 double butted aluminium
Fork: Rockshox Revelation RC / 29 / 130mm
Rear Shock: Rockshox Deluxe Select+ / 190x45
Groupset: SRAM NX Eagle, 1x12, 11-50
Brakes: SRAM Guide T
Seat Post: Love Mud Membar
Wheelset: Love Mud Hobo 29er
Up to date geometry for trail bike agility and enduro bike stability

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.

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 top tube to your crotch this will give you enough seat post adjustment to find your optimum saddle height. Generally we recommend:
Riders between 5ft 2in and 5ft 7in
Riders between 5ft 6in and 5ft 10in
Riders between 5ft 9in and 6ft 2in
Riders of 6ft 2in +
Size Small Medium Large X-Large
ST - Seat tube 395 445 470 508
ETT - Effective Top tube 592 616 644 668
TT - Top tube 600 615 628 646
HT - Head tube 120 135 145 160
HA - Head angle 68 68 68 68
SA - Seat angle 73 73 73 73
CS - Chainstay 440 - 460 (adjustable) 440 - 460 (adjustable) 440 - 460 (adjustable) 440 - 460 (adjustable)
BB - BB drop 58 58 58 58
FO - Fork offset 50 50 50 50
WB - Wheelbase 1142 1154 1168 1190
SO - Stand over 736 767 782 808
RE - Reach 410 430 455 475
SK - Stack 595 609 618 632
Build Spec
BuildCortex NX Eagle Recon
Frame:Sonder Cortex Frame
Fork:Rockshox Revelation RC / 29 / 130mm
Rear Shock:Rockshox Deluxe Select+ / 190x45
Headset:Love Mud Rumour / ZS44/ZS56
Seat Clamp:Love Mud Gromit / 34.9mm
Group Set
Brake Front:SRAM Guide T / 950mm
Brake Rear:SRAM Guide T / 1800mm
Rotor Front:Avid Centreline Rotor / 180mm
Rotor Rear:Avid Centreline Rotor / 160mm
Rear Mech:SRAM NX Eagle Rear Derailleur / 12 / Long
Rear Shifter:SRAM NX Eagle Trigger Shifter
Chainset:SRAM NX Eagle Crankset DUB / 170mm / 32
Bottom Bracket:SRAM Bottom Bracket / DUB
Chain:SRAM NX Eagle Chain / 118 Links
Finishing Kit
Stem:Love Mud Piskie Stem / 31.8mm / 45mm
Seatpost:Love Mud Membar
Saddle:Love Mud Abode / Black
Tape/Grips:Love Mud Clutch / Black
Handlebar:Love Mud Aspect Riser
Wheels:Love Mud Hobo 29er
Front Tyre:WTB Vigilante / Light High Grip / 29 / 2.5
Rear Tyre:WTB Trail Boss / Tough Fast Rolling / 29 / 2.4
Tubes:WTB Inner Tube / 29 / 1.9-2.3
Frame:S: TBC; M: TBC; L: TBC; XL: TBC
Built:S: TBC; M: TBC; L: TBC; XL: TBC
Pedals not included with full builds
Frame Spec
Alloy 29er short travel full suspension trail bike
Weight (kg): S: 2.73; M: 2.91; L: 3.05; XL: 3.11
Hydroformed and custom butted alloy frame tubing
Internal cable routing
Rear Shock: Rockshox Deluxe Select+ 190 x 45 mm
Horst link suspension layout
120 mm rear travel; 130 mm fork travel
Clearance for up to 29” x 2.6 in wide tyres
73 mm BSA threaded bracket shell
148 x 12 mm 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)

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.

The Details

Ex-Display Cortex NX Eagle - Large in action