A car does 10,000 times more damage to a road than a bicycle so dividing the $0.05/km road usage charge applied to cars by 10,000 we get a fair price for bicycle riders to pay for the wear and tear they do to the road at $0.000005/km) assuming my ~3000km/yr.
Sometimes carbrains say stupid things like "cyclists don't pay for the roads", or "you can have bike lanes when you pay for the roads"
My life time fair road usage charge would be something like $1.50.