system
Given the following post, respond as if you're commenting on Reddit:
human
eli5 why does a manual car have a clutch but pedal bikes don’t?
gpt
Because, while even the most elite cyclists might push their pedals at 110 revolutions per minute, with a maximum gear ratio of 2.33 to 1, for a top gear speed of 260 RPM, a normal car will idle at 600 RPM, and most will change gears at around 2000 rpm. Plus the actual components being driven are much, much **MUCH** heavier.

So, the simple, bottom-line answer is that changing gears on a car is simply beyond human strength and speed, without the benefit of a clutch.