Sonder Cortex Short-travel 29er full suspension mountain bike for epic days over mixed terrain
Fast and agile, Cortex is for epic days over mixed terrain. It comes alive on long technical descents with 120 mm travel, big wheels and a stiff responsive frame.
Sonder Cortex SX Eagle Recon
Fast and agile short travel full sus 29er mountain bike with SRAM SX Eagle, 1x12 groupset, Recon fork and Deluxe rear shock
Sonder Cortex NX Eagle Recon
Fast and agile short travel full sus 29er mountain bike with SRAM NX Eagle, 1x12 groupset, Recon fork and Deluxe rear shock
Sonder Cortex NX Eagle Revelation
Fast and agile short travel full sus 29er mountain bike with SRAM NX Eagle, 1x12 groupset, Revelation fork and Deluxe rear shock
Sonder Cortex GX Eagle Revelation
Fast and agile short travel full sus 29er mountain bike with SRAM GX Eagle drivetrain, Revelation fork and Deluxe rear shock
Sonder Cortex GX Eagle Pike
Fast and agile short travel full sus 29er mountain bike with SRAM GX Eagle drivetrain, Rockshox Pike fork and Deluxe rear shock
Sonder Cortex GX Eagle Cane Creek
Fast and agile short travel full sus 29er mountain bike with SRAM GX Eagle drivetrain and Cane Creek Helm fork and DBIL rear shock
Sonder Cortex Frame and RS Deluxe Shock
Fast and agile short travel full sus 29er mountain bike with Rockshox Deluxe rear shock
Sonder Cortex Frame and DBIL Shock
Fast and agile short travel full sus 29er mountain bike frame with Cane Creek DBair IL rear shock
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.
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.
Clearance for up to 29 x 2.6in tyres.
Internal Cable Routing
Internal routing in the front triangle for clean lines.
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)|
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:
- 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 +
|ST - Seat tube||400||425||465||485|
|TT - Top tube||587||608||636||658|
|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||442||445||447||450|
|BB - BB drop||40||40||40||40|
|FO - Fork offset||51||51||51||51|
|WB - Wheelbase||1169||1191||1220||1244|
|SO - Stand over||TBC||TBC||TBC||TBC|
|RE - Reach||420||440||465||485|
|SK - Stack||602||606||615||625|
|Fork Axle to Crown||540||540||540||540|
Swapouts and Upgrades
You can interchange Love Mud components on this build at no additional cost. So if you want a different length of stem, a particular saddle or bar then let us know in the notes section in the checkout and we'll get in touch. We also hold big stocks of SRAM, Rockshox, WTB and regular build with Shimano, Hope, Cane Creek. We'll build your Sonder with any part that suits your needs. Give us a call, with the same experienced mechanic helping throughout your build you know who to call if there's anything you want to know.
Alpine Bond Warranty
We offer a 10 year guarantee on both our handmade titanium and Reynolds steel frames. Our hand welded 6061-T6 alloy triple butted frames and carbon frames come with a 5 year manufacturing defect warranty. All our bikes are built, checked and signed off by Cytech trained mechanics before being despatched to you in a custom-made bike box.
Explore other content related to Sonder Bikes on our site.
Our summary of the 2020 edition of Strathpuffer
No Sleep Till Sunday
Throwback to Strathpuffer 2018
Testing New Frontiers
Join us for a spin in the Peak District
Second City Divide Part 1
Alpkiteer Steve Bate takes on the Second City Divide
Adventure Training at Alpkit
Proper training in the outdoors
Sonder Winter Gravel Series
Keep your legs moving over winter with Sonder
Sonder Storybook 2019 Comp Now Open
Release your inner Dervla Murphy
Body, Bike, Mind and Me: Part 2
Exploring mindfulness on the Highland Trail 550
Body, Bike, Mind and Me
Exploring mindfulness on the Highland Trail 550
Reccying The Dales Divide
The first one round the Dales Divide
Lisbon to Malaga: A Bikepacking Adventure
Bikepacking from Lisbon to Malaga
A custom Titanium Fat Bike care of Sonder Bikes