Endurance Innovation

84 - Dan Bigham


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  • 4:15 Dan’s interest in the sea level hour record
  • 8:00 sea level vs altitude hour attempts
    • At altitude, reduce aero drag by ~20% to 25% (at world record hour speeds) while only losing 10% of aerobic capacity
    • The higher the speed the greater the benefit of altitude. That is, the faster the event, the higher up you want to go
  • 12:15 at Dan’s speed, 1W saved in his setup = 50m of extra distance in the hour attempt
  • 12:30 the physiological demands of Dan’s hour record
    • A Watts / CdA of 2250, which works out to ~370W @ a CdA of 0.164!
    • Living on your TT bike
    • Train at a race-relevant internal inertia (cadence)
    • The potential role of central nervous system (CNS) fatigue
    • Learning to maintain that optimized position for the duration of the event
  • 24:15 the sitting up vs aero tradeoff when climbing
    • ~15W benefit to sit up vs aero position, which for Dan makes enough of a difference at ~27kph
    • The value of a stretch during a position change is not to be undervalued
  • 28:30 the value of efficient cornering 
  • 30:15 the role of CNS fatigue in performance in an hour record attempt
    • Not well understood at present
    • Dan’s group is studying this effect by taking measurement of nerve impulses to the driving muscles over time and looking at changes
  • 36:45 the effect of non-round chainrings
  • 40:00 Dan’s non-aerodynamic optimizations
    • The more aerodynamically optimized you become, the more reason there is to look at equipment
    • A new, secret crank set
    • Drivetrain lubricants, chain, cog and chainring design 
  • 51:30 Dan’s aero optimization
    • Skin suits
    • Front ends / cockpits
    • Aero sensors
  • 74:30 some psychological demands of an hour record bid

Check out Dan's retail venture WattShop as well as his Instagram page for products and updates on his upcoming hour attempt. 

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Endurance InnovationBy Andrew Buckrell and Michael Liberzon

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