Originally Posted by
tanguy frame
Just replaced my chain after 2000 miles; stretch was >1% (0.1%?) as measured by calipers. Cassette and chain were originally both new.
The new chain is smooth as silk except that the 19T cog skips on hills. All other cogs work fine.
Do you really mean that the stretch was more than 1%? (People often get "<" and ">" mixed up.
) If so, that's really pushing it, and should be avoided in the future.
If the 19T cog doesn't skip on level ground, I would just keep running everything together -- as the chain elongates a little with use, it'll match the condition of the 19T and will skip less badly.