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This is Northroads' definition:
Must ride without TT bars/extensions, no TT helmet,
no 'trip socks' etc, wheel depth less than approx 60mm ie: BC Road Race legal with wheels as above90mm seems pretty deep to me.
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"Hands must be holding the handlebars at all times"
technically that means brake hoods are out which is a bad idea ;)
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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.
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dbr
hippy
frank9755
@ewanmac
These are Xav’s rules for the road bike. Is there anything specific that people would add or remove from this to improve them? We are meeting tomorrow to decide on the rules for a road bike category in all of our upcoming TTs and these are already a substantial improvement on what has so far been suggested.