Loading event…
We use only the cookies needed to keep you signed in and remember your language and theme. Optional categories stay off until you choose. Read our privacy & cookies policy.
A last-man-standing road cycling endurance challenge
20 June 2026 · Miercurea Ciuc, Harghita
Spartan attrition on the road around Miercurea Ciuc: ride the same 48.59 km / +309 m loop again and again. A new loop launches every two hours — 10:00, 12:00, 14:00, 16:00 — with an 18:00–19:00 lights break. Miss a start, you're out. The last rider standing wins.
Date
20 June 2026
Where
Miercurea Ciuc, Harghita
Discipline
Ciclism de șosea — anduranță cu eliminare (last-man-standing)
The loop
1
The challenge
Leonidas Challenge is an elimination endurance event by Randonneurs Miercurea Ciuc. There is one course — a 48.59 km loop with 309 m of climbing — and you ride it over and over. A fresh loop sets off every two hours: 10:00, 12:00, 14:00 and 16:00, with the 18:00–19:00 hour reserved for fitting lights before riding into the dark.
The rules are brutally simple. Be on the start line when the next loop launches, complete the lap, recover, repeat. Riders drop out as legs and resolve give way, until a single rider is left turning the pedals. No stages, no shortcuts — just the loop, the clock, and how long you can hold on.
The loop
Every two hours you take on the same circuit again. The distance below is the per-lap loop — your total depends on how many loops you survive.
48.59km
Practical info
Details
Leonidas Challenge 2026 este o competiție de anduranță cu eliminare, în bucle succesive de 48.59 km / 309 m+ elevație. Start la fiecare 2h (10:00, 12:00, 14:00, 16:00), cu pauză între 18:00-19:00 pentru lumini. Organizat de Randonneurs Miercurea Ciuc.
On the day
A new loop launches every two hours at 10:00, 12:00, 14:00 and 16:00 — be on the line or you're out.
Miss a start and you're eliminated. Riders are whittled down loop by loop until one remains.
The gap between starts is your window to refuel, fix lights in the 18:00–19:00 break, and reset for the next lap.
A small field of endurance riders sharing the same 48.59 km circuit — pure attrition, shared respect at the line.
Schedule
Odihnă și montarea luminilor pentru tura de noapte
Location
Start, finish and every loop run from Miercurea Ciuc in Harghita — the heart of the Székely Land, ringed by the road climbs that make up the circuit.
Good to know
In and around Miercurea Ciuc, Harghita county — the start point and every loop run from there, organised by Randonneurs Miercurea Ciuc.
There is one loop. A new loop starts every two hours (10:00, 12:00, 14:00, 16:00), with an 18:00–19:00 lights break. Be on the start line for each loop or you're eliminated — riders drop out until a single rider remains.
Each loop is 48.59 km with 309 m of climbing. You ride the same circuit repeatedly; your total distance grows with every loop you survive.
Entries are handled on the official registration form; use the Register button on this page. Entry is by on-site donation.
Subscribe for reminders as the loop times and details are confirmed, or sign up now on the official form.