CC-4 - Chain Wear Indicator

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A better quality chain tool can help, or using calipers/a ruler as you are using. See this article from Zinn, for example -- essentially, you need to get an idea of the errors your tool makes, and you can be conservative with the replacement requirements (analogous to oil change intervals for cars; this can be a bit wasteful). Or, get a more accurate measurement (analogous to oil life meters in newer cars). It looks like he uses the Progold or Rohloff tools, which are inaccurate, but by getting an idea of the errors it makes, you can make a rough guess if you need to look closer for measurement, or just say screw it and replace the chain (even if its early) Most riders will be able to change the chain at a (real) wear of 0.5% but I have seen some where they can do so at nearly 1% wear, without skipping. a) If we have sent you the incorrect bicycle, we will cover the cost of collection and delivery of the correct model. I settled on your inner measurement approach (pictured above) and calibrate my Vernier calipers against a CC-2 device, so I could translate a linear measurement into an approximate % wear. I did this by creating a calibration regression chart converting the Vernier L1 measurement to a stretch percentage (see below). I figured that while the CC-2 can be difficult to use consistently, it should at least be generally accurate. Note that my calibration measurements involved only a very light push on the CC-2 gauge. CalibrationHowever this isn't ever a fixed point; it varies with the chain type, the rider, and the pattern of use. So some folk get away with changing the chain at (a real, pin-wear only ) elongation of 0.75%, others can't go more than 0.5% safely. Because you are also attempting to use Vernier calipers to estimate chain wear I thought I would share a method I derived for using Vernier calipers. I decided to follow the same method as the Park tools (inner measurement - your L1 approach - for 10 links) as I wanted to include wear on the bushings (as this is what the cog interacts with). As many have pointed out there is no perfect way to measure chain elongation.

Our experts recommend certain products for every rider, including stands. Your bike addict options in this category include event, portable repair, and wheel truing stands. And we’ve got shop aprons, bar style shop stools, and mechanic gloves along with coffee mugs when you’re ready to take a break!If you find an item at a lower price with another commercial internet retailer, you will receive it from us at the same price, provided the conditions listed in the link are met.

Perfectly uniform wear (to the nth degree) is not that likely, but if the chain is wearing unevenly to a noticeable extent, this may be a clue that it isn't just ordinary wear that is the culprit; it may mean that the chain is corroding as well. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item. Customs clearance fees -these vary from country to country and also vary by declared value in some juristictions. There are two ways to go about buying the Park Tools you’ll need. The first is to get the equipment already bundled, like our home mechanic starter kit, and the second is to piece the right items together as you need them.

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As you can see your measurement of 120mm suggests 0.4% stretch. Typically I will measure the chain with Vernier calipers in three random places and take an average, then compare against the chart. I also record these measurements and regress them against the current distance or duration to get a better estimate of the current wear rate, as well as projecting service intervals. Predicting Service Life