Really depends upon what riding you are doing. How clean and lubed you keep the transmission. Road dirt and salt do terrible things to the chain.
Drop into most bike shops and they will have a gauge that will check the wear of a chain.
Normally a chain over 1% worn should be replaced along with the cog on the back as the two wear at the same rate.
The front ring normally lasts about 3-4 chains as each tooth takes less force on the way round.
Normally once a year to 18months
Really depends upon what riding you are doing. How clean and lubed you keep the transmission. Road dirt and salt do terrible things to the chain.
Drop into most bike shops and they will have a gauge that will check the wear of a chain.
Normally a chain over 1% worn should be replaced along with the cog on the back as the two wear at the same rate.
The front ring normally lasts about 3-4 chains as each tooth takes less force on the way round.