BikeCRT · Use your own agent
Cycling,
connected.
We want athletes to be the best versions of themselves and to understand how their decisions on the bike result in performance.
We develop sophisticated simulation tools based on physics and physiology to provide deeper understanding in the context of fitness, training, racing and the course.
We offer a connected platform for understanding the interconnected system of rider, bike, equipment, course and environment. Past results inform present assumptions about where you are and help you plan future races. CRT stands for Course Review Tool, but it has become so much more.
What we value
Self-knowledge and growth. We value self-actualization, self-knowledge, learning and discovery.
Accuracy and useful insight. We take a marginal gains approach to truth and accuracy, with pragmatic advice. Some insight is often better than no insight.
Play and adventure. We value play, discovery and adventure. Cycling should be fun.
Cycling is a system
You, your bike, your gear, your fitness, the course and the environment are all connected in an interdependent, evolving system.
Past, present and future are connected too. BikeCRT helps map the system and the relationships within it.
Start with what matters to you
Your goal
What would make this a good race or ride for you?
Your biggest concern
Where would you like help, or what worries you most?
Start with one question. Your experience and previous rides can help your agent ask the next useful one.
Kona toolkit · 2026
Explore your race, one question at a time.
We want Kona athletes to have the best race possible. Plan the bike with the whole race in mind, bringing pacing, position, conditions, hydration and nutrition together.
Start with the free calculator for a quick bike estimate or comparison. Take the question further in the Kona planner with section pacing, positions, dated weather and a fuel-aware plan.
The free Kona calculator uses physics-based course simulations run in advance and checked against separate simulation cases for fast browser comparisons.
Calculator: no account. Planner: account required.
What will my power get me?
Start with a bike-time estimate, or work backward from a target time or historical bike percentile. Compare steady power with terrain targets. Use the planner to examine individual course sections and turn-limited stretches.
- Free calculator · Power, target time, bike percentile and terrain pacing.
- Kona planner · Section comparisons and where effort changes the ride.
A useful next question: Do you want to explore a planned power, find the power for a target bike time, or compare pacing choices?
Bike time uses the entered power and setup. Your long-ride experience helps you choose a race target.
How will wind and heat affect my plan?
Compare historical wind choices with the frozen forecast for October 10, 2026 in the calculator. Review its issue time: the snapshot does not update live. The planner adds section weather review and editable conditions along the course. Direction and bike start time matter when interpreting an estimate.
- Free calculator · Compare historical choices with the frozen dated forecast and their bike estimates.
- Kona planner · Dated weather and section conditions along your plan.
A useful next question: Which conditions worry you, and which part of the course would you like to examine?
The selected weather supplies the planning conditions; personal heat response and gust handling need separate judgment.
How much could a bike setup change save?
Compare a plausible change in aerodynamic drag, carried mass or rolling resistance while holding the other assumptions steady. Drag, climbing and acceleration do not matter equally everywhere; examine section differences as well as the total.
- Free calculator · Compare assumed CdA and total carried mass.
- Kona planner · Explore setup changes and section differences.
A useful next question: What would actually change in your setup, and what evidence supports that assumption?
An equipment name alone does not establish a drag reduction; check current event rules before considering a change.
What does time out of aero cost me?
Compare whole-ride CdA assumptions in the calculator to see why position matters. For time out of aero in particular sections, use the planner. Sitting up may change both drag and the power you can hold.
- Free calculator · Compare constant whole-ride CdA assumptions.
- Kona planner · Compare aero and upright assumptions in selected sections.
A useful next question: Where do you expect to sit up, and what position can you comfortably hold?
Compare the drag and power you expect in each position, including any comfort-related power trade-off.
Can we estimate my aerodynamics?
Start with a provisional CdA, the effective aerodynamic drag area of rider and bike, and compare plausible values. Keep the estimate visible so it can be refined with better evidence.
- Free calculator · Explore provisional CdA values and aero presets.
- Kona planner · Refine position assumptions within the race plan.
A useful next question: Do you have a previous estimate or test, and how closely does it match your race setup and position?
Wind, power and rolling resistance also affect a ride-time match; explore a CdA range while refining your estimate.
When might I reach a course point?
Use the simulated bike timeline and course sections for planning. Combine bike elapsed time with your expected bike start when discussing a meeting or nutrition point.
- Kona planner · Use the simulated timeline and course-section arrival times.
A useful next question: Which location matters, and do you mean time since bike start or a race-clock time?
This is a planning estimate, not live athlete tracking; swim, transition and stops affect the clock.
Can we review my food and drink plan?
Use the planner’s fuel and hydration views to count planned intake and examine its timing alongside your race assumptions. Your agent can help organize the questions and explain the result you choose to share.
- Kona planner · Count planned intake and examine fuel and hydration timing.
A useful next question: What have you practiced, what will you carry, and what do you expect to collect on course?
Mechanical bike work is not a direct calorie or hydration prescription. Individual sweat rate and tolerance need personal evidence.
How does my plan compare with past results?
Compare your bike estimate with historical age-group percentiles in the calculator. The planner adds historical race context alongside your plan. Check the year, age group and discipline before comparing with a previous field.
- Free calculator · Compare a bike estimate with the selected historical age group.
- Kona planner · Review historical percentiles alongside the race plan.
A useful next question: Which age group and result are relevant to your goal?
Use the selected year and age group as context; this year’s field can differ.
From conversation to evidence
“Ten more watts” — where?
A whole-course time is a start. Comparing one section can help you see whether extra effort buys useful time there, how much mechanical work changes, and what happens when you sit up.
Try a terrain-power comparison in the calculator. Use the planner to inspect particular sections, then discuss the result and its assumptions with your agent.
For your agent
Read the structured toolkit (JSON) →
- Lead with what the comparison reveals and how it helps the athlete’s question. Make the useful result easy to find.
- Ask one useful question about the athlete’s goal or concern, then suggest a focused comparison.
- For a first bike estimate or a supported comparison, offer the free calculator without signup. Suggest the planner when the question needs its section, fuel or saved-plan features.
- Use the published experience URLs. Operate the calculator’s browser controls and read its result; reading this guide alone does not perform a calculation. If you cannot operate it, help the athlete use the controls and discuss the result they share.
- Use the athlete’s supplied inputs. If a value is unknown, offer a clearly labeled starting comparison and help refine the value that matters most.
- Separate cycling intuition from a computed BikeCRT result. Report the useful difference, the changed inputs and the assumptions that matter.
- Explain an assumption or model limit where it changes the answer or next decision. Keep that explanation brief and beside the finding it qualifies.
- Suggest the next experiment when it could change the decision. Let the athlete choose what to run and share.
Prepare a calculator setup link
Your agent can prepare a steady-power setup for you to open. These examples change only target power; they use the calculator’s other defaults.
steady· Steady target power (W, 100–400)mass· Rider mass (kg, 50–100)cda· Effective aerodynamic drag area (m², 0.18–0.34)bike_kg· Bike mass (kg, 5–15)kit_kg· Dry kit and containers (kg, 0–3)water_m3· Starting carried water; 0.002 m³ is 2 L (m³, 0–0.005)wind· Weather scenario; omitted wind uses the frozen 2026 forecast (average, light, strong, forecast_2026_10_07)
Set mode=power and pacing=steady for these setup links. Numeric values use the listed units regardless of the display-unit setting.
Omitted values use the calculator’s current defaults. Review the visible assumptions; use Copy setup link for a complete configuration, including race timing, terrain or inverse modes.
Open the link and read the calculated result before reporting a BikeCRT finding. Creating a link alone does not calculate or save a result.
Some combinations are outside the checked model coverage. Check the result and any shared-setup warning; an invalid link can show the starting setup instead.
Setup values are visible in the URL to anyone who receives it. Include only inputs the athlete chooses to share; never put names, account credentials or conversation text in the link.
Direct agent connections are in development. Conversation happens in the athlete’s own assistant; this guide and the browser calculator are available now. The athlete chooses what to share with their provider.
Beyond Kona
The Kona race planner is live and free with an account. The wider BikeCRT app for exploring rides and routes is in development and coming soon.
Discover BikeCRT →Start with the free Kona calculator, or open the Kona planner to explore pacing, position, conditions, food and drink together.