In advance of the National TT Champs which are promoted under UCI Regulations and as such must have bikes conforming to UCI Standards, please see the link below for a specification document that highlights the dimensions and what exactly is checked on the evening of the Time Trial Championships.

This is to provide awareness for everybody to plan accordingly and avoid issues on the night with non conforming bikes which will result in the rider not being permitted to start. 


http://www.cyclingireland.ie/page/disciplines/road/tt-bike-specifications