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Cadbury test their mettle

The Race Around Ireland is an Ultra-Marathon World Cup event and a qualifier for the Race Across America. Solo riders and relay teams will complete a 2100km lap of Ireland, taking in rugged mountain climbs and stunning scenery.

The race is a non-stop event which will see the competitors riding through the night. Solo racers and two-person teams will start from Navan, Co. Meath at 8pm tomorrow evening, four-person and eight-person teams will start on Tuesday at 8pm.

Cadbury Ireland have entered a team into the Race Around Ireland, Europe's toughest cycling challenge, in order to raise funds for Make a Wish Ireland.

The eight-strong team will ride around the circumference of Ireland in 96 hours enduring some of the toughest and challenging terrain, as part of Cadbury's Spots v Stripes initiative, to mark their sponsorship of the London 2012 Olympic Games.

The race is part of the Ultra Marathon Cycling Association (UMCA) World Cup series which includes other huge endurance races such as The Race Across America.

Unlike the RÁS or the Tour de France, for example, the course is in no way roped off. There are no marshals controlling traffic flow, and there are no planned rest stops or stages in this event.

In The Race Around Ireland, designed to be one of the most gruelling bike races in the world, once the clock starts in Navan it won't stop until each rider reaches the finish line.

The inaugural winner last year, Joe Barr is a non starter.