How do y'all deal with iron gear wheels?

So I got Factorio somewhat recently, and have been enjoying it so far. I'm on my third playthrough now, but I haven't beaten the game yet, I've mostly been starting new playthroughs whenever the factory gets to a degree of spaghetti where I just don't know how to expand it. But in my most recent game, I've begun to notice a problem - there are never enough iron gear wheels. Ever. I'm using a main bus design, and the very first set of assemblers along the bus are producing iron gear wheels - so a good amount of my iron is going to gears. And my factory isn't low on iron - it's definitely an in-demand resource, but I have three belts of iron ore producing three belts of iron plates as fast as the smelters will work, which comes out to a fair bit of iron. But I just can't manage to get enough gears. How do you guys deal with iron gear wheel production?