Hi,
My OEM chain (choho) lasted about 8000km (5000mi) and it was badly worn, with uneven stretching. But I'm over 36000km now and still got the original front and rear sprockets, wich show some wear but still have plenty of life left on them. I -do- maintain my chain lubed and with proper (erring on the side of loose) tension.
Regards,
Juanro
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