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I have a Jamis Citizen 2 Step through (2013 or 14 maybe) which has a braze-on on the underside of the seat stay near the brake studs. Just one braze on each side. I'm curious as to what the intent is and what opportunities they enable. I already mounted rack and fenders so I'm not talking about the brazes near the seat tube. In the photo behind the link look closely and see the braze-on just on the inside of the back wheel.

Here is the bike:


Zoomed in photo highlighting the specific braze-on: enter image description here

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Since that is a "comfort bike", I would initially suspect the braze-ons are to fit something like a child seat, but then there would be eyelets on the rear dropout. If it were only on the drive side, I'd suspect it's for a chain shield, but you're ambiguous as to whether there are two or only one. Or the wheel lock theory is a good one. – Daniel R Hicks Sep 25 '13 at 11:14
up vote 8 down vote accepted

I'm not positive, but I believe those are for a frame-mounted wheel lock. These are locks that you mount to the frame in roughly that location that immobilize the rear wheel when locked. Typically they mount via the brake braze-ons or their own straps, but that location looks about right for a direct mount

An example of a fitted lock can be seen in this image:

AXA lock on Jamis

This type of lock is convenient, but not especially secure, since a thief can always just pick up the bike and carry it off. Some do include a way to plug in a cable or chain in order to lock the bike up to something else, but those aren't especially secure, either.

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I had that idea myself after looking at this photo. – BPugh Sep 24 '13 at 23:52
AXA Defenders have plug-in chains as well as plug-in cables available, for what it's worth. – D.Salo Sep 25 '13 at 0:31
Confirmed per email from Jamis – BPugh Sep 26 '13 at 12:04

I believe those are for frame-mount rear racks. While some can attach to the seat post, others can attach to the frame. The link shows an example:

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I'm not certain I'm following you here on this. The link and product page only show the standard mountings for a frame mounted rack. I'll try to add some to my question to see if we are on the same page. – BPugh Sep 24 '13 at 17:41
Those usually mount to the braze-ons on the outside of the seat stays. This question is about a more unusual braze-on on the underside of the seat stays. – freiheit Sep 24 '13 at 18:14
The braze-ons that @freiheit are talking about and that those racks attach to are actually visible in the picture in the OP's post. – jimirings Sep 24 '13 at 20:17
Correct, I keep forgetting to take a photo of them when I'm at home. – BPugh Sep 24 '13 at 20:28

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