Bike Chain Gauge
thingiverse
A simple gauge used to measure the length of a bike chain accurately. One side measures the exact length of 6 new links, while the other indicates when the chain has stretched more than 0.5% and needs immediate replacement. You want your chain to fit perfectly on one side but be too tight for the other. If it easily fits both sides then its time to replace the chain right away! My gauge will also show if the chain is so worn out that the cassette and chainrings require replacing as well - but if your chain is slack on both sides of this gauge chances are you're beyond a cheap fix point! Use one or two more shells than usual when printing, use dark-colored filament because it gets dirty quickly.
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