Tried a Park Tool chain checker vs. a plain ruler and my mind is blown

I've been fixing bikes for like 12 years now and always used the old ruler trick to check chain stretch. Measure 12 inches from pin to pin and if it's off by 1/16th, swap it out. Worked fine for forever. But last month I grabbed a Park Tool CC-3.2 chain checker on a whim because my regular one broke. The difference is ridiculous. It catches stretch way earlier than I ever could with a ruler, like I was letting chains go way too long. Found out my ruler method was reading clean on a chain that the checker said was toast. Saved me from replacing a cassette early on a customer's bike just last week. Anyone else have a tool they thought was pointless but turned out to be a game changer?

3 comments

3 Comments

max2231mo agoTop Commenter

That ruler trick worked fine back when chains were built different, but modern chains wear out in ways a ruler just can't catch. You're saving yourself a lot of headache catching it early with that checker.

the_sam1mo ago

wait chains used to be built different?? like they actually lasted longer or something? i had no idea that was a thing, thought the ruler trick just always sucked.

price.ben1mo ago

Man, that is such a good example. It reminds me of a buddy who swore by the ruler method for years. He was dead set it was good enough. Then he found a used torque wrench at a garage sale, just a basic beam type, took it home for laughs. First time he used it on his seatpost clamp he almost fell over. Turns out he'd been over-tightening everything by a ton for like a decade. He was cracking parts and never knew why. Now he won't touch a bolt without checking torque first. Funny how a ten dollar garage sale find changed everything for him, right?