When I set up our Road Bike category for the TTs at Hillingdon 5 or 6 years ago these were the rules I had:
"we don’t allow any aero clip on bars / time trial / triathlon bars. No pointy aero helmets, no disc wheels. Wheels should be no deeper than 60mm"
60mm was meant to allow Zipp 404s, and I think I named them as an example, as well as Dura Ace C50, which I had. But it's a bit arbitrary and I agree that deep rims have increasingly become mainstream since then.
I never measured any wheels at the start but I did end up having to DQ the guy who won the series the first year after he posted on Strava that he had got away with using deeper wheels than he should have done! If I was doing it now, I can't see why I wouldn't go for 90mm as the limit.
Look pretty good to me.
When I set up our Road Bike category for the TTs at Hillingdon 5 or 6 years ago these were the rules I had:
"we don’t allow any aero clip on bars / time trial / triathlon bars. No pointy aero helmets, no disc wheels. Wheels should be no deeper than 60mm"
60mm was meant to allow Zipp 404s, and I think I named them as an example, as well as Dura Ace C50, which I had. But it's a bit arbitrary and I agree that deep rims have increasingly become mainstream since then.
I never measured any wheels at the start but I did end up having to DQ the guy who won the series the first year after he posted on Strava that he had got away with using deeper wheels than he should have done! If I was doing it now, I can't see why I wouldn't go for 90mm as the limit.