How many strokes are there in a Bike?

Answer 1

I'm not entirely clear on what you're asking about here. For a human-powered bicycle the word strokes aren't really used. For a motor cycle it'd be more applicable. Motor cycles can basically come in two different engine types, two-stroke and 4-stroke. 2-stroke motors are lighter for the same amount of horsepower, but they also pollute more and waste more fuel. They're usually found in dirtbikes. 4-stroke engines work "just" like the one in most cars. They run cleaner, use less fuel but are heavier for the same amount of horsepower. They give more torque at lower revs and do fine for more casual riding.