Tried a Park Tool chain checker on my beater bike and a ruler on my race bike, the cheap way won

Nathan Ward · 2026-09-30T17:30:03.754864+00:00

I've been running a little shop out of my garage here in Fort Collins for about 3 years now, mostly tune ups and drivetrain swaps for the local gravel crowd. Two weeks back a regular dropped off his race bike with a Dura-Ace setup and asked me to check the chain because his shop back in Denver told him it was toast at 0.5 percent wear. I grabbed my Park Tool CC-4 checker and it read right at the limit, so I almost ordered him a new chain on the spot. But something felt off, so I laid a plain steel ruler next to 12 inches of chain with the bike in the stand and measured the stretch myself. The ruler said the chain had barely moved, maybe a 1/32 past 12 inches, which is nowhere near the 1/16 that counts as worn out. The pin based checker was reading the wear on the rollers and not the actual stretch of the plates, so it was calling a perfectly good chain dead. I did the same thing on a rusted out beater with a KMC chain and both methods agreed it was done, so the ruler is not magic, it just doesn't get fooled by dirty rollers. Saved the guy $70 on a chain he did not need, and now the ruler lives on my bench right next to the checker. Has anyone else caught a pin style checker giving a false reading on a chain that still had life left in it?

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Tried a Park Tool chain checker on my beater bike and a ruler on my race bike, the cheap way won | Bicycle Mechanics - Free To Speak