"At the extremes, a vegan cyclist will produce only 5% of the emissions a conventional pickup truck will produce, while a meat-loving cyclist will actually produce 42% more GHGs than the most efficient EV. " http://large.stanford.edu/courses/2022/ph240/schutt2/

I’m sure the exact numbers are a little open to interpretation but I’ve seen it mentioned more than once in different places. That said, I absolutely try to commute on my ebike as much as possible

Definitely a ton if variability in what you’d actually put out depending on bike type, speeds, diet etc

Paradoxically there are actually some indications that the calories burned while bicycling, especially from a meat-heavy diet, lead to more carbon emissions per mile than powering an electric car with anything other than coal. https://www.greencarreports.com/news/1108357_electric-cars-vs-bicycles-which-has-a-higher-carbon-footprint There are still a wide variety of societal benefits to more bicycling but it’s not quite accurate say “zero” impact I think.