Year of Manufacture *: All
Quite often references are made to timing chains 'stretching' and brake discs 'warping'
I suppose, in the interests of accuracy, if we are professionals talking to customers, then perhaps we should get it right.
Roller chains suffer from pin and bushing wear which changes their pitch, but the metal doesn't stretch.
Likewise, brakes discs suffer from thickness variation or uneven run-out, but the metal can't warp.
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