![]() ![]() Problem number two is that the cotter pin should be filed to fit snugly against the axle to get the whole assembly to fit together really well, which is a whole other bunch of hassles. The number one design issue is that the cotter pin has to be extremely tight – it’s better to hammer or press it in than just rely on the nut – making it difficult to remove the bottom bracket to service it. The pin goes through the crank and when you tighten its nut the crank is clamped against the axle. The cotter pin has a matching flat side that is cut at an angle. The axle is usually round with a section at the end where the crank sits. ![]() Here are eight dodgy and archaic features to avoid when buying a used bike… Split cranksĪ cotter pin is held to the axle by a shaped pin called a cotter pin. Browse bike ads on eBay and Facebook Marketplace and you’ll see many “vintage” bikes and semi-finished “projects” with archaic bike parts that have all but disappeared from mainstream cycling – and for good reasons.
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