Zone3 are absolutely delighted to be the Official Swim Partner for Castle Triathlon Series in 2019 and to support this event series across their selection of stunning and iconic castles across the UK, Ireland and France.
For the absolute beginners on shopper bikes to the grizzled triathletes on wind-cheating £10k steeds, the Castle Triathlon Series offers a wealth of race distances to suit all multi-sport abilities.
The Castle Triathlon Series events all promise an inspirational and memorable race experience.