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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.
Scilly.Suffolk-
These ones are single side mounted. Don’t think the vibrations are too bad. I’ve certainly not noticed it being an issue.
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No, not at all. The best bet would be to design a bracket to mount on one side, as you'd have no luck with any sort of standardisation.
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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.
M_V
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Thanks.
Could be but that design is somewhat specific to the width of the stays (so the light is centralised) and the angles (so it sits straight).
It’d probably be easy enough for someone to tweak it into the right shape but I was thinking that one that bolted to the bridge might be a bit more universal.
I also want to change the way the light attaches as I think I can improve that aspect.
I think I’ll try make myself a new one (I currently run one like @gillies) and if I can make it work how I want I’ll offer them to others.