Originally Posted by velocentrik

Why do you want disc brakes? They are heavier, more complicated and don't stop as well as properly adjusted v-brakes.

On tandems (very heavy load for two tire bicycle) disc brakes are revealed as the frauds they are. In this industry as bike mechanics we know the paradigm changes because they need to sell new bikes. That doesn't make them good in terms of performance or weight.

Read this:

Understanding Braking