Seeing a couple moving off with their bikes today and the manny dutifully donned a pair of trouser clips, it occurred to me as the purpose of these 'trad devices' is to keep the end of trousers out of the chain, why do folk use two when the chain is only on one side - ? Same with folk who tuck their trouser ends into their socks, often both sock are employed. The only reason that it was the use of cotter pins to secure cranks onto the BB axle. I can still vaguely recall back in the dim distant past of a nearside cotterpin grabbing my trouser bottom at an awkward moment. Anyone else verify this - ?