You are scrolling through road bike listings and every one throws a different number at you — 11-speed, 12-speed, 2×11, 1×12. The natural assumption is...

You just picked up a new road bike and the valve on the inner tube looks completely different from the one on your old mountain...

You are staring at two bikes on the shop floor — one with Shimano 105, the other with Ultegra — and the price gap is...