Quote Originally Posted by stanley83 View Post
Anyone have a chart for how many grams of CO2 are required to fill tires of different sizes? I use CO2 inflators for my bicycles and have several CO2 "pumps", but have no idea how much CO2 or how many cartridges I would need for a motorcycle or scooter tire.
Three of the 12 gram cartridges brought the rear tire of the sport bike I was helping at the time to about 20 PSI... enough for him to ride very slowly the several miles to the nearest gas station. A 16 gram cartridge would have done a bit better. My emergency tire repair kit contains 6 cartridges.

Quote Originally Posted by stanley83 View Post
p.s. I have an electric pump, but over the weekend I ran my Vespa's battery flat trying to top up a tire. It could have been bad had I not been near a gas station.
If I've got the panniers on the bike (usually) then I've got an air pump. I do not run the pump unless the engine is running.