Lots of people who mountain bike, don't use their big ring. So they remove it. Then they go buy a huge bash guard to go in its place, so they have something to smash into instead of that gear they don't use. Problem is that bash guards cost like twice as much as big rings. So when I was building orange bike, I decided to make it a single speed. So I removed the granny gear. And i put the chain on the middle ring. Then I removed the big ring, used a metal grinder to grind all the teeth off and make it nice and smooth, then put it back on. I'm so friggin' smart!