The Problem

Realtime cycling position capture in the field doesn’t exist. This has implications for both performance and recreational cyclists who rely on semi-static bike fittings and/or time in a wind tunnel to go faster and be comfortable for longer.

Background

  • Roughly 90% of a cyclist’s energy is used overcoming air resistance at a race pace
  • The rider accounts for ~80% of the total drag.
  • Changing bike position and related contact points (handlebars, stem, seatpost) is cheaper than a new aerodynamic equipment (new bike, wheels) (~$80 vs. ~$2000+)
  • Renting a wind tunnel is costly (~$1000) and doesn’t show you what’s happening on race day
  • Bike position measurements are typically done when you’re “fresh”
  • May not reflect what happens in the real world
  • Data is lost!
  • Long and short term trends in flexibility/posture aren’t quantified *Useful for off-bike training *Observing performance over seasons

Solution:

Sphnx:

  • Uses a simple battery operated sensor system to track the user’s cycling posture
  • Measures distance between top tube and rider’s chest to extrapolate hip angle
  • Measures hand position via capacitive elements that can be installed underneath handlebar tape
  • Provides optional auditory feedback to the rider
  • Useful for Time Trials/Solo efforts in a Race
  • Can be integrated with other sensors and metrics to track changes in performance
  • Used in conjunction with power data would track most power effective posture
  • Ultimately helps strike a balance between aerodynamic and comfort with quantitative measurements

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