I worked in a tire store right after my military training. I needed some place where I could use my mechanic skills, and they needed people who weren’t master mechanics.
We always had tons of business. We did front ends-- shocks, tie rod ends, CV boots and joints, ball joints, brakes, alignments, and changed oil. We did a lot of package deals, like if you got tires and brakes, you got a discount on the labor, because we just had to take everything apart once, and we’d throw in an oil change for free. We also did other things, like occasionally replacing starters, if someone needed that, and brakes as well. We sometimes did U-joints and differentials. Those weren’t that common, but they are things people put off, and it’s hard to put off a flat tire.
Tires bring people in, because if you don’t have a tire, you can’t go. It’s amazing how crappy a car can be, and people will be driving it. We had people whose cars had to be push started, who had holes in the floor, whose wheels wiggled around like their tie rods were made of silly putty, whose cars belched huge clouds of black smoke when we started them, brakes squealing like a baby seal, but they had to have tires.
Anyway, a lot of the time, people knew about the six other things that were seriously wrong with their car, that they had been putting of for whatever reason-- time, money, but when they had to bring it it because a tire blew, they’d want to know how much more for X, Y, and Z. They knew that as long as they were paying for the labor to take off the tire, they might as well fix the tie rod end that had been bad for six months, and maybe replace the squealing breaks, or as long as they were applying for credit, they might as well apply for $500 as $250. And since they were already taking 1/2 day off work to bring the car in, they might as well replace the other tire that was totally bald, before it cost them another 1/2 day.
As far as location, car shops are often centered around a bus hub, so it’s easy to get a bus home, or to work, and body shops are always near a car rental place, because body shops do a lot of crash repair.
Parts stores are near shops, because we run out and buy stuff, when we get an unusual model, and don’t have a part for it. There’s usually a couple of fast food places, and a coffee shop nearby, because not everyone likes to wait in the store.
Like I said, we always had more work than we could handle. There was a Goodyear about five blocks away. They probably got tons of work too.
And no, we never ripped people off. Really. I haven’t worked there in 20 years, and have no investment in this, but we were scrupulous in what we recommended to people.