This is very interesting. I’ve often wondered what the carbon footprint of my several bikes are and this answers that question. I confess that while I had thought that my 13 year old Ti bike had a bigger footprint than my steel commuting bike I hadn’t considered the fact that the more exotic the bike the bigger the footprint.
I take the point that I probably only use two of my bikes in place of the car while the other five are solely for leisure or racing. However, when I’m out on my “best” bike I’m not consuming anything other than a snack bar so for a few hours my footprint is very small.
One final thought. My 2013 diesel Octavia, in real life, puts out about 1kg CO2 each 5 miles. So 1500 miles would probably be similar to the footprint of my second-hand Trek Boone. I wonder now many cx seasons it would take before my footprint driving to the events outweighed the footprint of the bike?