I have a Raleigh City Sport, Technium frame, with a Sach 2050 rear drum brake that is shot. Anyone have advice on converting it to a disk brake. I'm thinking a mount adapter would be situated about the same place on the frame as the brake strap and the clearance should be okay, But don't know where to go from here. Love the vintage look, but this seems like a better way to go than trying to fix something so obsolete..

I'm no expert, but I thought disk brakes on frames not designed for disk brakes was a non-starter.

Hate to say it...Find another Technium in better condition -that doesnt need a brake conversion-. Youll be muchhhh happier.

People are quick to say that you can’t add a disc to a frame that isn’t designed for it. What would be the big differences? Disc specific chainstays or seatstays? They don’t exist. Disc specific fork blades exist. The others don’t. All the back end needs is a brace between seatstay and chainstay, along with the brake mount.
You’ll need a disc specific fork though. This would be a good time to have one made. Then you can convince the builder to mount the front brake where it belongs, on the front side of the right leg. That way you won’t need stupid crap like lawyer lips or thru axles.

You're right. I would be happier with an original brake on a Technium. Think I'll try to rebuild it or replace it. Disc brake as a last resort for the old bike. Thanks for the tough love ... for me and my bike. Everything else is doable.