My first bike had one gear. Whether I was going fast or slow, uphill or downhill, that gear did everything. My next bike had three gears: one for level surfaces, one for going uphill, and one for going downhill. My third bike had ten gears, allowing me an even broader range of choices. Even though my last bike had several gears to choose from, I didn’t use all of them every time I rode. Some were best suited for starting and climbing, others were reserved for gaining speed, and others were best for a leisurely pace. But the thing about gears is this: Even though I wasn’t using all of them at the time, it didn’t mean I would never need them.