Setup
Export a .xrk from a MyChron 5 or 6
The .xrk is the session file Lapnotes reads. Here's how to get it off your MyChron — about two minutes once you've done it once.
You'll need your MyChron 5 or 6 with the session still on it, and a computer running AiM Race Studio 3 (RS3) — AiM's free software.
The stepsLogger to Lapnotes
Open Race Studio 3
Don't have it? Download it free from AiM and install it first.
Connect your MyChron
Race Studio 3 finds the logger and lists it under its connected devices.
Download the session
Pull it from the logger into Race Studio 3 so it shows up in your list of sessions.
Export it as a .xrk
Select the session and export it — that .xrk file is the one you'll upload.
Drag the .xrk into Lapnotes
That's it — your debrief is ready in seconds.
Good to know
- MyChron 6 is fully supported, and the MyChron 5 writes the same session file, so it works too.
- GPS and RPM are picked up automatically whenever they're in the file.
- No gyro on your logger? It still works — Lapnotes ranks your corners and tells you where the time goes; it just won't guess at chassis rotation it can't measure. (See no gyro data in the glossary.)
- Something look off? Send us the file and we'll sort it.
Once a logger is paired, Race Studio remembers it — the whole loop takes under two minutes. Export several sessions at once and upload them together; Lapnotes lines them up by track for you.
If something's offTroubleshooting
Race Studio can't see my logger
Try a different USB-C cable — charge-only cables won't carry data. Still no luck? Connect over WiFi instead — your MyChron pairs with Race Studio 3 wirelessly. On Windows, make sure Race Studio 3 (not the older Race Studio 2) is installed.
I can't find the .xrk export option
Make sure you're in the Analysis view, not Download — export lives on the right-click menu of a downloaded session. If you only see .drk or .xrz, those are fine too: upload them and we'll handle the conversion.
My MyChron 5 — does it even make a .xrk?
Yes. The MyChron 5 writes the same session format as the 6, so the export path is identical. GPS and RPM are read automatically when present.
Send us the file you've got — whatever the extension — at paul@lapnotes.com and the person who builds it will sort it. Beta users set the roadmap.
No .xrk handy right now? See a real session analyzed first, then come back when you've got yours. When you're ready to read it, the telemetry guide walks through what the numbers mean.
You've got the file. Now read it.
Drop your .xrk in and Lapnotes ranks every corner by the seconds it's costing you — in plain English.