calikid2006

I have an old lugged steel Puch that has a high bottom bracket and seems to have a good track frame geometry (although it was originally a 70s road bike). Can I take out the simi-horizontal dropouts and braze in new horizontal dropouts to make a track frame?

thanks

Six jours

No. You will end up with a 70s road frame with track dropouts. If that is what you need, then it is a fine project -- but it still won't be a track frame.

Servo888

Doesn't the bike frame already have horizontal road dropouts? They're not track dropouts, but you still have some adjustment available for chain tension.

unterhausen

if you have horizontal adjustment, I wouldn't bother. There are some frames that aren't worth preserving, and a Puch might well be one of them.

Erzulis Boat 

There is more to it than meets the eye.

The chainstay/dropout is "higher" (vertical distance) on a horizontal dropout vs. the track dropout.

If you just chop the old bit off, slot the seatstay/chainstay ends and insert the track dropout, you will lower the BB and create a sloping (rearward) toptube, and this will effect the geometry.

You will have to do some cold bending on the chainstays (downward) to get the correct lineup (rear axle/BB/front axle). You could always make your own track dropout with a lower adjustment slot, and tailor it specifically to the old frame.

misha misha

the drop outs wont do much good. If you have a chain adjastability i wouldnt even bother. Geo will still stay the same road, not track. So thertes no point really