A group of enthusiasts are hoping that a Wales tree could win the European Tree of the Year competition.
They think that one great oak that lies in the picturesque Ceiriog Valley near Chirk has a history that gives it one of the best stories to be found between Cardiff and Kiev... Rob Shelley has been to discover more.
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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.