A TT helmet typically saves 15–30 watts at 40 km/h compared to a standard road helmet. Over a 40K time trial, this translates to approximately 30–90 seconds for most riders, depending on speed and conditions. The faster you ride, the greater the absolute time savings because aerodynamic drag increases with the square of velocity. For a rider averaging 40 km/h, expect savings in the 45–75 second range over 40K.
Cycling Helmet · Time Trial / Triathlon Helmet
How much time does a TT helmet actually save?
Related gear types
If this answer nudged you toward a different style, these guides compare specs and trade-offs.
Road Cycling Helmet
$50 – $350
Lightweight, well-ventilated helmets optimized for road cycling speed and endurance.
lightweight constructionextensive ventilationsleek aerodynamic profile
Aero Road Helmet
$150 – $500
Aerodynamically optimized helmets minimizing drag for competitive road cycling and time trials.
smooth aerodynamic shellreduced vent counttruncated tail profile
More questions
- Can I use a TT helmet for road riding or group rides?
- Is a TT helmet worth it for a beginner triathlete?
- What happens if I lift my head or look around in a TT helmet?
- Should I choose a TT helmet with an integrated shield or wear sunglasses?