[Christ]

There's a bike with a 20:1 ratio on it that goes like a normal bike.

It has like 52" tires on it, though. LOL.

You have to remember all the parts of the equation.

Of course, that advice applies more greatly to the "overdrive" discussion in transmissions, and why it's not always necessary to have an OD gear.

EDIT - Those ratios are completely made up. They have no basis in reality, and while I've personally seen bikes with 50+" tires on them (in the past), I have no idea what gear ratios were used. Think of the tricycles with one giant front wheel, though.