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Rear Drop Out Angle on Vintage Bike

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Rear Drop Out Angle on Vintage Bike

Old 10-09-23, 06:41 PM
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Rear Drop Out Angle on Vintage Bike

I measure about 73 degrees on this bike. 64 cm seat tube. It was built for a claw derailleur hanger, but I would like a more modern set up. Are there “common” angles that were used in mfg bikes? I see a few 72 and 74 degree dropouts from suppliers.
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Old 10-09-23, 07:58 PM
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Just to be sure you are talking about the angle between the stays, not the angle of the slot relative to... Andy
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Old 10-09-23, 08:44 PM
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Originally Posted by Andrew R Stewart
Just to be sure you are talking about the angle between the stays, not the angle of the slot relative to... Andy
seat stay to chainstay angle, which is how I assume they are described on sales sites.

Also, used a protractor, should have used a tape measure and a trig table!
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Old 10-10-23, 04:27 AM
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Unless they are socket style dropouts, you can make a single angle dropout work for a wide range of angles between seat and chain stays. The tabs are generally wider than the stays and you can shape them to flow better with the angle of the stays.
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Old 10-10-23, 07:19 AM
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Originally Posted by dsaul
Unless they are socket style dropouts, you can make a single angle dropout work for a wide range of angles between seat and chain stays. The tabs are generally wider than the stays and you can shape them to flow better with the angle of the stays.
These are indeed tabs, not sockets, so I do have some wiggle room. Can a socket style be brazed over a slotted stay or would that leave too weak a connection?
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Old 10-10-23, 09:23 AM
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Originally Posted by etherhuffer
seat stay to chainstay angle, which is how I assume they are described on sales sites.
That angle will vary with frame size and chainstay length, and is really only an issue for socketed dropouts. Traditional tabbed dropouts can accommodate a wide range of angles.
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Old 10-10-23, 04:47 PM
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I wouldn't try replacing tabbed dropouts with socketed ones. Sounds like a recipe for frustration and early failure.
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Old 10-12-23, 06:30 PM
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Why the concern over early failure?
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Old 10-13-23, 04:59 PM
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If you cut off the slotted part, the dropout isn't going to fit the frame. If you don't cut out the slotted part, it's going to be structurally questionable.
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