When to Change Your Bike Chain? Measuring Chain Wear Correctly Myths and Theory.

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Published on Feb 15, 2021

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How to measure chain stretch correctly? In fact, it is worth dividing 2 methods by which you can determine whether your chain is worn out, or whether you can still use it. It is believed that when the chain stretches by 0.75% (only 10 mm along the entire length), it should be replaced immediately. However, modern tools on modern chains can lie, usually underestimating these figures. This happens if you try to measure the chain elongation with a conventional tool that measures the distance from one edge of the roller to the opposite edge of the other roller. In this case, the error can be caused by a non-standard roller size (roller diameter). If the chain roller has a larger diameter than the manufacturer specified when developing the tool (usually 7.6 mm), then the tool readings will be underestimated, and in fact, the chain is stretched by 1%, and not 0.5% as the tool shows. And if the roller is of a smaller diameter (this is rare), then the tool, on the contrary, will overestimate these values. Therefore, to correctly measure wear, it is worth using a tool that determines the net elongation (stretching) of the chain. This can be a ruler, calipers, or special tools. Or a tool: https://veloplaneta.ua/izmeritel-izno... https://www.parktool.com/product/chai... If you use a regular tool that was designed for a standard roller size (7.6 mm), then you can use the following table: Roller with a diameter of 7.7 mm - add 0.1% to the gauge (tool) readings Roller with a diameter of 7.75 mm - add 0.15% to the readings Roller with a diameter of 7.8 mm - add 0.15% to the readings Roller with a diameter of 7.85 mm - add 0.2% to the readings Roller with a diameter of 7.9 mm - add 0.25% to the readings *Data for a tool that measures wear on 10 links. If measurements are taken on a smaller number of links, the error increases, that is, the actual stretch is even greater. And if on a larger number, then less. Chain roller diameters: (The table will be supplemented, write your data in the comments to the video) Shimano M8100 - 7.63 mm Shimano HG95 - 7.64 mm Shimano HG701 - 7.64 mm Sram GX - 7.64 mm Sram XX1 Eagle - 7.73 Sram Eagle AXS - 7.74 Calculation table. https://docs.google.com/document/d/1S... Useful links: Chain tests: https://cyclingtips.com/2019/12/the-b... How to measure wear: https://cyclingtips.com/2019/08/bicyc... How to measure wear: https://www.bikeradar.com/features/ho... When to change a Park Tool chain: https://www.parktool.com/blog/repair-... We are in social networks: Vasya on Instagram: / kapushak_vasile Dima on Instagram: / shmumpel Bogdan (Editing): / rick3rri Timing: 00:00 - Introduction 00:22 - Terms 01:21 - Why does a chain stretch? 02:01 - When to change a chain? 04:06 - Stretching or wear 05:42 - Myths 07:15 - Roller diameter 09:30 - Pure chain elongation 09:58 - Measurement nuances 12:04 - Measuring with a caliper 12:52 - Fuck up #chain #chain_wear #bicycle

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