About 14,000 cyclists are expected to take part in the British Heart Foundation’s (BHF) London to Brighton Bike Ride.
The event on Sunday sees cyclists travel 54 miles from Clapham Common to Brighton seafront to raise money for the charity.
Charity partners including Mind, Children with Cancer, Breast Cancer Now are also taking part in the ride to help to raise funds.
Cyclists will start the journey between 06:00 BST and 09:00.
The BHF is running transport services from Brighton to Ardingly Showground and London before the event, between 04:30 and 06:30, and afterwards from noon until 20:00 for participants that have booked a ticket.
About £1m was raised through the ride in 2024.
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