Bikers will tomorrow be tackling The Buttress – a steep 350-metre incline from the town centre towards Heptonstall – in a new time trial.
The Buttress, a one in three gradient in parts, is part of national cycle network route 68.
Not for the unfit or faint hearted, the hardest and steepest climb has already attracted lots of interest between different cycling groups and the challenge has been set.
Who will be the fastest: mountain bikers, roadies or cyclocross?
Prizes have been donated for the winner.
The challenge has been organised by expert bikers and is part of the South Pennines Walk and Ride Festival.
Katie Kinsella, principal officer for tourism in Calderdale, said: “This provides a fantastic opportunity for Calderdale to be showcased as an area for outdoor activities.
“Working with the enthusiasts to arrange these events has been a great experience.
“Their local knowledge and expertise is invaluable. We hope that the Festival will grow year on year and improve the cycling opportunities in Calderdale for visitors and local people.”
For more information on registering for “Up the Buttress” go to www.singletrackworld.com
For more details on the festival which runs from September 10 to 25, visit www.walkandridefestival.co.uk.