The mileage considered "a lot" for a motorcycle can vary depending on various factors, including the make and model of the motorcycle, its maintenance history, the type of riding it has been subjected to, and the overall condition of the bike.
In general, motorcycles are designed to be durable and reliable machines, capable of covering significant distances. Mileage alone cannot be the sole determining factor for assessing whether 20,000 miles is a lot for a motorcycle. Many motorcycles can easily surpass 20,000 miles with proper maintenance and care.
Regular maintenance, such as oil changes, chain adjustments, and tire replacements, becomes increasingly important as mileage accumulates. It's always a good idea to have a qualified mechanic inspect the motorcycle's overall condition if you're considering purchasing a used bike with 20,000 miles or more.
Ultimately, the significance of 20,000 miles will vary depending on the motorcycle and how it has been maintained and ridden.