Originally Posted by Lunigma
Only a fool would disagree with Sheldon (bike-wise that is). you didn't mention if you put chain lube on the chain, you didn't mention if you put a new cog on either.
a new chain (even a crappy one like KMC) will wear faster with an old cog, no lube and a super tight chain. you did sooo many things wrong. what size chain ring and cogs are you running? cogs that are smaller than 16T are known for jumping the chain off easier. a short wheel base will help make it jump aswell. even if your chain did get really really stretch out that wouldn't be enough of a cause for it to jump, it needs another force.
get a brake if you don't know what your doing.
Wow. That was possibly the worst post I've ever read. Lets break it down:
1. SHELDON BROWN IS NOT GOD!!! I know this is blasphemy in some circles but he is fallible. Jesus why do you put so much faith in someone you have probably never met and may not even exist for all you know.
2. I have never heard that smaller cogs make jumping a chain easier and I have a strong suspicion you deduced that yourself becuase there are less teeth on a smaller cog. Having a smaller cog wuld be the least of his worries I think and how many teeth does a 15t cog engage vs a 17t? Maybe 1 less...
3. Wheelbase making a chain jump? Maybe but I doubt it.
4. Have you ever ridden a really loose chain? Going fast down a hill would be enough to throw it.