@Phil Hodson: rbrnut is correct - you can change chain rings to your heart’s content without any problems.
@johnny senna:
- I can’t give an exact date for the track version yet, but it will be this year, likely before mid-year.
- Unfortunately you can’t use a PC7, because it uses a proprietary protocol.
- Our power meters are designed not to need recalibration. We guarantee the calibration for the duration of the warranty (2 years). After about 5 years it would be good to check it using a stable reference (e.g., a steep climb of at least 300m vertical ascent). However, it should not change. You can send it to us for a factory calibration, but it’s not necessary.
Best
Nicolas