Bikes "have to be light weight" even if the riders are fat.
Cars can just burn more gas.
For example the "transmission" on my bicycle is this crazy open air greasy oil contraption that instantly gets covered in rust if not oiled or gets wet, alternatively gets covered in sandy grit if oiled and its a maintenance headache and parts are lucky if they last 10K miles.
On a car, you just burn more gas to haul heavy parts, and my car transmission has an external case that must weigh 100 pounds, but the fluid in it is continuously purified by filter and magnet and will last the life of the car maybe 250K miles with no maintenance required, generally.
Its kinda interesting you can tell how old a "Car Guy" is by how much maintenance he thinks a car transmission requires. In the REALLY old days transmissions were so unreliable there were dedicated transmission repair shops.
Another typical subsystem is brakes. Cars often have brakes often last over 50K miles, although those parts are very heavy and a bear to work on. On bikes, they have to be small and light, so maybe 1K miles average.
Cars can just burn more gas.
For example the "transmission" on my bicycle is this crazy open air greasy oil contraption that instantly gets covered in rust if not oiled or gets wet, alternatively gets covered in sandy grit if oiled and its a maintenance headache and parts are lucky if they last 10K miles.
On a car, you just burn more gas to haul heavy parts, and my car transmission has an external case that must weigh 100 pounds, but the fluid in it is continuously purified by filter and magnet and will last the life of the car maybe 250K miles with no maintenance required, generally.
Its kinda interesting you can tell how old a "Car Guy" is by how much maintenance he thinks a car transmission requires. In the REALLY old days transmissions were so unreliable there were dedicated transmission repair shops.
Another typical subsystem is brakes. Cars often have brakes often last over 50K miles, although those parts are very heavy and a bear to work on. On bikes, they have to be small and light, so maybe 1K miles average.