Ironman & Triathlon Bike Time Estimator
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Planning your next Ironman or triathlon race? Use this advanced Bike Time Estimator to predict how long your bike segment will take based on your personal stats, power, and gear. Whether you’re a beginner or a Kona qualifier, this tool helps you prepare smarter for real-world race conditions—tailored to official race profiles like Hradec Králové, Nice, Roth, and more.
🎯 Why use this calculator?
- Calibrated with real triathlete data and elevation profiles based on published GPX files
- Optimized for both TT and road bikes
- Supports power-based, FTP-based, or speed-based predictions
- Built for Czech athletes and races, with a friendly localized interface
📍 Supported Triathlon Races
The calculator includes real-world course data (distance and elevation) for the following races:
- Ironman Hradec Králové 70.3
- Czechman
- 5150 Hradec Králové
- Ironman World Championship Kona
- Ironman France Nice
- Ironman 70.3 WC Marbella
- Ironman Lanzarote
- Ironman 70.3 Cascais
- Ironman Cascais
- Ironman Barcelona
- Ironman 70.3 Kraichgau
- Ironman Austria
- Ironman Emilia-Romagna
- Ironman Hamburg
- Ironman Frankfurt
- Challenge Roth
- Ironman 70.3 Zell am See
🧠 What Inputs Does the Calculator Use?
Here’s a quick guide to the variables you’ll enter:
🛠 Estimation Mode
Choose one of the three:
- FTP (Functional Threshold Power) – Your best 1-hour cycling power in watts
- Average Power – Your estimated average power for the bike leg
- Average Speed – Your expected average bike speed in km/h
📏 Rider Details
- Height (cm) – Used to estimate aerodynamics (larger riders = more drag)
- Weight (kg) – Your body weight
- Bike + Hydration Weight (kg) – Total bike + bottles, nutrition, etc.
🚴♂️ Bike Type
- TT Bike – Optimized for aerodynamics (most Ironman athletes use this)
- Road Bike – More upright position, typically slower
📊 What Does the Result Show?
Once calculated, you’ll see:
- Estimated bike split time
- Average bike speed
- Required power
- Elevation gain for the selected course