Organisers of the Gore Bike Wear TransWales powered by Mercedes-Benz Vito Sport have released details of the course for this year's event, which starts on 13 August.
There'll be a standalone prologue marathon, seven un-timed linking stages and six timed special stages, including one day over the border in Shropshire. In total, riders will cover 534km and face 15,255m of climbing.
You can view the full route, with profiles of each stage, at www.mtbtransuk.co.uk/wales/stages.php. Registration is now open and there are still places for pairs and solo riders available. Organisers say: "Not just endurance but also tactics, the right equipment and an ability to pace yourself will be key to enjoying as well as to winning this event."