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Having had a little think I would say that mounting to one of the rack mounts would be sufficient for this, and avoid spacing issues. I have mocked one up from card and waved at various bikes, the only issue seems to be with bikes that have seat stays that come low (below top tube centre line) and a road caliper, as well as very small bikes. Would there be any issue in having a small run done of these? I'd imagine ~£10.
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I'm not running a dyno at the moment so feel free to ignore me.
I've been looking for a way to just mount a rear battery light somewhere other than my seatpost due to saddle bag. Thought about rack mounts but on my frame, they're rivnuts parallel to seatstays, not parallel to the ground so on anyone's frame thats like mine, using that^ would have the light pointing up in the air or slanted down, not horizontal.
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That looks lovely. I'd almost certainly take one but don't have a rack mount on the frame and there's no brake bridge, just some awful 3d printed thing that makes the mudguards clatter. Anything you could recommend? Don't want seat post mount because of saddle bag and won't be running a rack. Quite like @amey 's seat stay mount but have no idea how I'd manage to attach a Supernova light there.
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I'd be keen for a couple of these!
PhilDAS
motoko
Is there a standard for siting rack mounts ( @coldharbour )? I'd think the distance between them is a fairly small range, which would make designing a more universal mount easier.
You've got a flat plate mounted on a round bar: strikes me you have most of the ingredients for a means of adjusting the beam vertically.
Mounting it on the bridge is an obvious option, but would increase the mudguard stack which might limit it's use a little and a single mount point will vibrate more which might affect the durability.
Rack mounts are probably more common than bridge 'guard mounts too.