TehK

I have a Miyata 512, and was wondering if there was any way to remove the mounts on the frame.

Here's a pic:

Dr.Deltron

The large diameter parts are removable by pulling them off.

The bosses that are left can be cut & filed. (hack job!)
Or unbrazed. (Burn job!)

Either one, you'll have some paint to redo. And that's a whole OTHER can of worms!

There are little doohickies that bolt to the shift bosses for bar end shifter housing stops.
Remove the threaded adjusters and they will make a clean "cap" for the bosses and still leave the frame unscathed.

Old Hammer Boy

Where do you want to go from here? Single speed, STI, bar ends? By knowing this, we can make suggestions.

moxfyre

Probably a better solution is to cover them with downtube shifter cable stops, which are rounded and less ugly than the bare bosses. That way if you ever decide to go back to a multi-speed bike (whether STI, bar-end, or downtube shifters), you'll be able to convert the frame back. The downtube stops are only about $10 and you can see what they look like on my bike: https://myxo.css.msu.edu/danimal/bike...an_sep2006.jpg

I just hate to see a nice Miyata frame butchered

gmason

Any tube strength reduction issues by removing all without adding something else?

moxfyre

Probably not. The downtube bosses on a steel frame are just brazed to the exterior of the frame, so they can be brazed off or filed carefully, without hurting the frame strength. I still think it's a shame to remove them from a nice Miyata though

TehK

Thanks, I plan on turning it into a fixed gear. And I don't care about the paint, I'll be taking it down to the bare metal, and possibly anodizing the frame, or just have it clear coated.

Edit: the frame has some rust and significant scratches on it, thats why I'm removing the paint. I wouldn't ruin a frame for nothing.

moxfyre

Gotcha. Full speed ahead then Should make a pretty sweet fixie.

TehK

Thanks, So I can just give the silver circular things a good tug with some pliers and they should come off?

Dr.Deltron

Yes, but the center piece will remain. Unbrazing is usually the easiest. You could probably use a propane torch to soften the brass, then a wire brush to remove the boss & remaining brass. Yes, while it's still hot.

Grand Bois

I tried to take mine off with a propane torch, but they wouldn't budge, even though they were glowing red. I ended up filing them off very carefully. It was scary, because it's a 48 year old Reynolds 531 frame, but they're gone and you can't find where they used to be. I protected the tube with a couple layers of duct tape in case I slipped with the file.

TehK

Thanks, next time I go home for the weekend I'll try that.