So, a while back when I was rebuilding my vintage Shogun 6-speed, I realized that I only use 2- 3 gears on my commutes to and from school, crew, and other daily rides. The next day, I went to my local used bike parts dealer and bought a 10 speed cassette, the type that has the 3 screw- in pins on the back and plastic spacers, and tried different variations of 3 non- lockring gears; one large gear, one medium gear, and a medium- small gear, which with the required 2 lockring cogs makes 5 total cogs.
Anyway, what I was wondering about is if it is physically possible to have a gearset like this; would the gaps between gears be too big? Is there any way possible to make a 4- 5 speed gearset, and not have the chain fall in between gears or not be able to grab the next one at all?
Also, I'll upload pics soon.