Male puberty to put the brakes on trans women cyclists

The UCI will ban transgender women who transitioned after male puberty from participating in women's events on its calendar under new rules which come into force from Monday.

Under the existing regulations, transgender women are permitted to compete in the female category providing they have a maximum plasma testosterone level of 2.5 nanomoles per litre.

In May, the UCI defended that policy as being "based on the latest scientific knowledge" following controversy after American Austin Killips won the Tour of the Gila in New Mexico to become the first transgender women to win a UCI women’s stage race

But cycling's governing body announced on Friday that its management committee had voted to change the rules after further consultation with stakeholders and a review of scientific, legal and human rights considerations.

A statement said that review had concluded that the maximum permitted testosterone level previously used was not "sufficient to completely eliminate the benefits of testosterone during puberty in men".

The statement added: "Given the current state of scientific knowledge, it is also impossible to rule out the possibility that biomechanical factors such as the shape and arrangement of the bones in their limbs may constitute a lasting advantage for female transgender athletes."

UCI president David Lappartient said: "First of all, the UCI would like to reaffirm that cycling – as a competitive sport, leisure activity or means of transport – is open to everyone, including transgender people, whom we encourage like everyone else to take part in our sport.

"I would also like to reaffirm that the UCI fully respects and supports the right of individuals to choose the sex that corresponds to their gender identity, whatever