Are these dropouts safe?
09-21-22, 12:21 PM
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Are these dropouts safe?
I picked up an old Jamis Coda Comp frame at the local co op. The rear vertical dropouts have either been ground down or the installed internal gear hub that had no anti rotation washers damaged the frame. It appears safe to me, seems like it wouldn’t affect anything, but I want to make sure before exerting energy into building around it. Is it safe?
09-21-22, 12:36 PM
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I'd ride it. But I'd make certain I was using a quick release with a steel skewer, internal cam, of quality and not an old one with the old cam shape. Easiest way to achieve that? Get a Shimano QR. (Front too for peace of mind. Front has a much easier job but it failing is far more injury to you.)
Clamp the QR tight. You should feel it begin to lock as the lever hits 90 degrees from the bike, ie in line with the axle. Final closure should be hard. Edit: the fact that the dropout is chromed means the form closure is more important. Chrome is very hard and does not indent under the pressure of the QRs teeth on the head and nut.
Clamp the QR tight. You should feel it begin to lock as the lever hits 90 degrees from the bike, ie in line with the axle. Final closure should be hard. Edit: the fact that the dropout is chromed means the form closure is more important. Chrome is very hard and does not indent under the pressure of the QRs teeth on the head and nut.
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09-21-22, 01:29 PM
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They're as safe as they ever were. The actual pocket where the axle sits is unchanged, and the flat area where axle and QR (or nut) face engage is only slightly lessened with the gap representing a small enough arc not to matter.
I suspect that the modification was to make it easier to slide a wheel in by creating a sort of funnel to guide the axle home.
Don't worry about it, and if you find it easier to put wheels in and out, you might find yourself considering similar changes to your other bikes.
I suspect that the modification was to make it easier to slide a wheel in by creating a sort of funnel to guide the axle home.
Don't worry about it, and if you find it easier to put wheels in and out, you might find yourself considering similar changes to your other bikes.
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09-21-22, 01:36 PM
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Thanks for the replies!
09-21-22, 01:53 PM
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As usual Francis got it right. The lower and leading edge of the dropouts were likely ground away to allow the QR end to clear the rear derailleur when installing or removing the rear wheel. This is a many decades old trick.
BTW Ben's advise to use a QR with a steel internal cam is spot on too. Andy
BTW Ben's advise to use a QR with a steel internal cam is spot on too. Andy
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09-21-22, 03:57 PM
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Thanks for the "As usual.....".
Especially considering the source.
Especially considering the source.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 09-21-22 at 07:35 PM.
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