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Cortex / X-Large
**Lead image represents the bike for sale, please see store pics for the actual bike.
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.
Geometry and Sizing
Sizing
| Size | Small | Medium | Large | X-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 tube | 400 | 410 | 440 | 460 |
| ETT - Estimated top tube | 576 | 597 | 625 | 647 |
| HT - Head tube | 100 | 105 | 115 | 125 |
| HA - Head angle | 65 | 65 | 65 | 65 |
| AC - Axle to crown | 550 | 550 | 550 | 550 |
| SA - Seat angle | 75.6 | 75.6 | 75.6 | 75.6 |
| CS - Chainstay | 440 | 440 | 445 | 445 |
| BB - BB drop | 40 | 40 | 40 | 40 |
| FO - Fork offset | 44 | 44 | 44 | 44 |
| WB - Wheelbase | 1173 | 1195 | 1229 | 1253 |
| RE - Reach | 420 | 440 | 465 | 485 |
| SK - Stack | 608 | 614 | 624 | 633 |
Frame Spec
| Weight: S: TBCkg; M: TBCkg; L: TBCkg; XL: TBCkg (plus shock 0.4kg) |
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| 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 |
Delivery is free over $99.
All duties and import charges are covered by Alpkit on products of UK origin. This includes the 10% universal import duty and
reciprocal tariffs, announced on the 11th April 2025. Customers who wish to proceed with a purchase can contact us directly via email at support@alpkit.com
to obtain a delivered price, inclusive of all applicable tariffs.