What is the NYCHTHEMERON?
NYCHTHEMERON takes its name from the ancient Greek word meaning ‘a complete day and night’.
This is not a race, it is a personal effort against time, terrain and fatigue, ridden on carefully designed gravel routes across the UK and beyond.
There are 34 routes to select from all over the UK and even a couple of routes in Italy.
Complete the challenge and win prizes.
The challenge structure is simple:
- Choose a GRVL‑approved NYCHTHEMERON route (12hr or 24hr).
- Share the challenge with 2 friends using hashtag #NYCHTHEMERON
- Complete the route within a continuous 12‑hour or 24‑hour window.
- Submit your Strava or Komoot activity to hello@grvl.com for verification.
Each route has been meticulously planned to be completed in 12 or 24 hours
THE REWARD
Complete a 24-hour route and receive:
- 50% OFF NYCHTHEMERON jersey.
- 30% OFF a future GRVL order
- A unique NYCHTHEMERON woven patch, designed to be stitched onto a rucksack, jacket or garment as a physical marker of the effort you put in.
- A prize bundle including discounts and special offers from partner brands including Veloforte, VANGO, Sportive.com and Tailfin!
Complete a 12-hour route and receive:
- 25% OFF NYCHTHEMERON jersey.
- 20% OFF a future GRVL order
- A prize bundle including discounts and special offers from partner brands including Veloforte, VANGO, Sportive.com and Tailfin!
UP TO 50% OFF THE NYCHTHEMERON JERSEY
Designed specifically for this challenge, the NYCHTHEMERON Jersey reflects the psychological edge of endurance riding. The psychedelic graphic nods to the altered mental state often triggered by sleep deprivation, fatigue and long hours in the saddle, when reality blurs and focus narrows.
Technically built for the effort, it features a tailored aero fit, ventilated back panel, three rear pockets and laser-cut hems with silicone grip. Constructed from sustainable OEKO-TEX recycled and biodegradable fabric, it is fast-wicking, breathable and UV resistant.
Complete a 24-hour route to receive 50% OFF a NYCHTHEMERON Jersey or complete a 12-hour route to receive 25% OFF.
Normal Jersey Price £135
BRAND PARTNERS & PRIZES
We’re working with like‑minded brands to offer prizes and rewards for those who complete our challenge!
Complete either challenge and unlock prizes and discounts from GRVL and our partners.
TAILFIN - 15% OFF
VANGO - £400 OFF a Project Hydrogen Bikepacking Tent
VELOFORTE - 24% OFF orders over £20
SPORTIVE.COM - 30% OFF Membership
THE ROUTES
NYCHTHEMERON routes are devised by GRVL and our Ambassadors, selected for terrain quality, character and challenge.
Routes span the length of the UK, including the Chilterns, Cornwall, North Scotland, Northern Ireland, the Peak District, Yorkshire, South Wales, Kent and beyond, as well as ambassador‑led routes in Norfolk, Swindon, North Wales, Salisbury, wider Scotland and even Italy.
A full route table with direct links to both 12‑hour and 24‑hour versions can be found below.
Simply select the route and time you want to complete and then download the GPX file.
THE ROUTES
| ROUTE NO. | LOCATION | 24HR | 12HR |
|---|---|---|---|
| 1 | North Scotland | HERE | HERE |
| 2 | East Scotland | HERE | HERE |
| 3 | West Scotland | HERE | HERE |
| 4 | Yorkshire | HERE | HERE |
| 5 | Peak District | HERE | HERE |
| 6 | North Wales | HERE | HERE |
| 7 | South Wales | HERE | HERE |
| 8 | Chilterns | HERE | HERE |
| 9 | Norfolk | HERE | HERE |
| 10 | Swindon | HERE | HERE |
| 11 | Salisbury #1 | HERE | HERE |
| 12 | Salisbury #2 | HERE | HERE |
| 13 | Cornwall | HERE | HERE |
| 14 | Kent | HERE | HERE |
| 15 | Northern Ireland | HERE | HERE |
| 16 | Ireland | HERE | HERE |
| Not Shown | Italy | HERE | HERE |
Disclaimer: The NYCHTHEMERON Challenge is a self-guided endurance activity. Riders participate entirely at their own risk.
GRVL, its ambassadors, partners, or representatives do not supervise, manage, or provide support for individual rides. You are solely responsible for your safety, decision-making, and judgment while riding, including equipment, navigation, weather conditions, and terrain.
Helmets, lights and appropriate safety gear are strongly recommended.
Riders must be considerate to other trail users. Upon seeing other users, such as horse riders and walkers, riders are required to slow down and pass with care.
Note that small parts of the route may require you to walk due to restrictions. Please check the route before you start the challenge so you are aware of these sections.
By participating, you acknowledge that GRVL bears no liability for any injury, loss, damage, or other consequences arising from your ride.
