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?

Dan