UI Ultra Marathon 2025 – Together We Run!

ultra 33Stari Grad to Hvar (Croatia), the 'Islands' edition, joins the growing UltraSwim 33.3 circuit, which aims to expand to 5 global venues by 2025. WHERE? The magical island ofThe Bora Ultra WTO 33 2-Way Fit rim meets ETRTO tubeless standard for fast-rolling tubeless tyre fitment, and is also suitable for tubeless-ready and clincher tyres too.