My problem was I used to think chains lasted indefinitely. ha Rode 2 Raleigh derailleur bikes over 10,000 miles, past when they were clunking on the cogs. Probably most of the reason I hated them so much. Plus, the 1940s SS coaster Rudge I rode in high school, which came from my great uncle, now has a chain stretched a whole 1/4". My dad rode it slowly for 40 years after I bought my bikes.