45%
Will all riders/organisers please note that
(Amongst others)
Planet X Five Spoke Full Carbon Aero Front Wheel
Zipp 1080
Mavic IO
X-Treme Aeromax
Do not comply with
regulation 14 (g) “Deep section rims, tri spoke and wheels of a similar design may be used. The front wheel must have at least 45% of the surface area open”
and should not be used on the front of machines.
Anyone found using such a wheel may be subject to disqualification and face disciplinary action.