How often should be the chain replaced ?
everytime you:
- think about it
- have no clue about when it has been done
- see as I saw a dramatic / dangerous mistiming of the chain...
Mine was 1cm longer than the new one (see in the vid) and my clock shows 49,000 kms (put 1 or 2 before...)
Apparently the combo chain + chain tensioner can last for a while but the (reasonnable) price speaks itself to change it