Originally Posted by
_ForceD_
I find it interesting that people who staunchly rely on dedicated brandname bicycle tools like Park or Pedro’s won’t trust the chain checking tools from those companies. I mean they produce accurate tools for every other aspect of bicycle maintenance…including torque wrenches for delicate CF fixtures. But for some reason their chain checkers can’t be trusted??? I even know of one case where a person deferred to a Park Tool ruler instead of a chain checking tool. If the chain checker is supposedly inaccurate…who’s to say the ruler sold by the same company isn’t inaccurate?
If this is aimed at my post, the answer's simple. There've been many laborious threads on why chain checkers aren't reliabile, having to do with precisely what is being measured. The Park chain checker works well for me as a gross check, but roller wear means that after the 0.5% mark, I trust a ruler more than any chain checker.