Chains and sprockets.

I never mix and match, I need more fingers and toes to count the number of times I have witnessed a stretched chain wreak havock, even to the point of serious blood loss.
 
I always replace both at the same time for $65! primary drive good stuff! I'm going on season three with my sons and looks good, however we don't get to ride a heck of a lot, Maybe ten fifteen times a year, and i also keep them lubbed! I think that helps alot!
 
Classic example of a sprocket destroyed by a stretched chain, the guy asked me to replace the front sprocket only.

What do you think my answer was?

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I always replace both at the same time for $65! primary drive good stuff! I'm going on season three with my sons and looks good, however we don't get to ride a heck of a lot, Maybe ten fifteen times a year, and i also keep them lubbed! I think that helps alot!

primary drive? is this a brand?
 
I do like replacing them all at once. Even though I may throw a new chain on mine soon without new sprockets simply because the 2 master link setup I have now bothers me