Originally Posted by
Lombard
Always trust the humble RULER. Get rid of the fancy dancy chain checkers.
1/32 inch is only half time. Replace when it wears 1/16 inch.
1/16” is only 0.5%. 3/32” is closer to 0.75%. I know that’s not much but it could be a few hundred miles worth of chain use.
I’m glad you posted the pictures below. It will illustrate my point about the 12” rule nonsense. I don’t usually leave the pictures in a quote but I’ll do so here.
So far so good.
Worn 1/16 inch - Replace chain.
Any time someone uses “approximate”, there can be absolutely no claim made of any kind of accuracy…nor precision for that matter. No instrument can be used to accurately measure anything beyond its range. Going beyond the range is useless data. What is shown is ‘12” plus something’. To make the claim that this is more “accurate” than other methods is to not understand what “accurate” means. All that can be said about this measurement is that the chain has
some wear.
Worn 1/8 inch - Your cassette is probably trashed at this point.
Making the estimate larger doesn’t make for a more accurate statement.