Bicycling (South Africa)

MEASURE CHAIN WEAR WITH A RULER

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Don’t own a chain wear tool? No problem. In a pinch, you can measure chain wear using a standard ruler (one with non-metric graduation­s works best). To do this, you should know that all modern chains have rivets every half inch (12.7mm), and that you’ll be measuring the distance from one rivet to another 12 inches (304.8mm) down the chain. Start by drawing the chain taut. Align the zero-inch end of the ruler with the centre of a rivet, then check where the 12-inch mark lines up. If it’s dead-centre on a rivet, the chain is in great condition. If the centre of the rivet is less than 1/16 inch (1.6mm) past the 12-inch mark, then the chain is showing some wear but still has plenty of life left in it. If the rivet is more than 1/16 inch past the 12-inch mark, then it’s time to replace.

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