Hi there! It sounds like you're experiencing a crash with the BikeMap app when you try to start a ride. Let's work together to troubleshoot this issue.

First, could you let me know if you’ve tried any steps to resolve this problem already? For instance, have you tried restarting the app or your iPhone? It can often help in situations like this.

If you haven't done much yet, here are a few initial steps you can take:

1. Force Close the App: Double-tap the home button (or swipe up from the bottom if your iPhone doesn’t have a home button) and swipe up on the BikeMap app to close it. Then, reopen the app and see if it works.

2. Reboot Your iPhone: Sometimes a simple reboot can resolve issues. To do this, hold down the power button and slide to power off. Then turn your iPhone back on.

3. Check for Updates: Make sure you have the latest version of the BikeMap app installed. Go to the App Store, search for BikeMap, and see if there’s an update available.

4. Reinstall the App: If the crashing continues, you might want to uninstall and then reinstall the app. Just press and hold the app icon until it wiggles, then tap on the 'X' to delete it. After that, head over to the App Store to download it again.

If none of these steps resolve the issue, I may need to gather more information or check for specific error reports. Are you able to tell me if you're receiving any error messages when it crashes? That would help a lot!