The Rasselbock 545

JUL

31

2027

Track endurance event at Horspath Athletics offering 6, 12, 24 and 48 hour races, with a £100 prize for the first to pass 545 laps under the event conditions.

Sat 31 Jul 2027

St Clement's, South East (England)

Website

12 Hour 24 Hour 48 Hour 6 Hour

Always double-check with the organizer's website! This page may contain affiliate links.

The Rasselbock 545

The Rasselbock 545 is a timed track event held at Horspath Athletics Track that offers endurance challenges over 6 hour, 12 hour, 24 hour and 48 hour formats. Participants complete repeated laps of a 400 metre track while aiming to cover as much distance as possible in their chosen time frame.

A previous record of 505 laps dates from the 2025 event. The cash prize target for this edition is 545 laps. The £100 cash prize is eligible for the first person to pass 545 laps within the 24 hour race or within the first half of the 48 hour race.

Organisers are investigating obtaining officiation with the International Association of Ultrarunners (IAU), but this is not guaranteed. Entry for the event is listed from £39.50. Visit the organization's website for the most recent information.

12 Hour

24 Hour

48 Hour

6 Hour