I need to replace my chainwheel and cassette, and it made me think. I know that the chain has to be a specific length relative to the number of teeth on the gears.
I was thinking about changing the cassette for one which a bigger 1st gear. Suppose I could get one with whatever number of teeth I wanted.
The bigger the better, right? If better means less effort to climb hills. But I have never seen a really big gear, like almost the circumference of the wheel.
I assume that's for a practical reason, not just because it would be very lazy if it worked and look ridonkulous :)