Originally Posted by
dedhed
I would also think a new disc mount fork could be installed on a vintage frame or mounts added by a competent frame builder, as the front is where the majority of your stopping power is anyway.
This is true - but why bother? Discs at the back still contribute to braking power. Converting an existing fork is risky (how many road bike forks are really up to taking disc braking power?) And this isn't a cheap solution. It makes more sense to buy a package designed for discs from the ground up.