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Very basic calculatuon but http://bikecalc-staging.herokuapp.com/wheel_size_math
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There are countless tables like this out there that do this job:
https://support.wahoofitness.com/hc/en-us/articles/115000738484-Tire-Size-ChartDivide by pi if you want diameter.
Can anyone point me to a website I know I've seen before but cannot find on Google...
Its simple webpage that lists the overall dimensions of all tyre/rim combinations from biggest to smallest.
Very useful to see what size 650b tyres you'd need to match the overall diameter of a 700c wheel!