How often should i change road bike tyres?

[eastman]

How often should i change road bike tyres....

[nfmisso]

* When the cord starts showing through the tread or side wall; or there is a significant increase in the number of punctures you are getting - which is an indication that the tread is getting thinner.

* If you get tread separation from the carcass - this is indication of underinflation or over loading.

* If you get cracks or tears in the sidewall - this is also an indication of underinflation or over loading.

[eastman]

Thanks for the reply...