Not all chainrings fit all cranksets. Most chainrings mount via a four- or five-arm ‘spider’ (the arms/spokes on the crankset). The spacing between these arms differs based on the intended gear range ...
In the first column of this series, I introduced the concepts underlying BCD (binary-coded-decimal) representations. In my second column I discussed how we go about adding and subtracting unsigned BCD ...
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