A touring organ donation campaign - 'Heart to Heart' - will visit towns and villages across Wales to raise awareness of changes to the system of organ donation.
The campaign encourages people to have open and honest conversations about organ donation and to make their wishes known to family and friends.
During the roadshow there will be an opportunity to find out more information about the process and how to sign up as a donor.
Under the proposals people would still be able to register as a donor, or they can register a wish not to be a donor. However, if they do neither, it will be presumed that they have given consent.
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More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.
A yellow 'be aware' warning has been issued by the Met Office for much of Wales.