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Tooth size isn't particularly useful. BMX all use the same width chain, so not much point in measuring thickness. Measuring tooth height won't tell you much either. The only thing left is the most useful info as well - tooth count. Count the teeth and you'll know what to get for a direct replacement as well as knowing what to get if you want change the gearing

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Q: How do you measure a tooth size on a bmx bike chainwheel?
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