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Raceware produce various Exposure mounts for aero seatposts (page 2):
https://www.racewaredirect.co/product-category/exposure-lights/There is also the seat stay mount and a saddle mount available (from Raceware).
I've used the Mk3 Blaze daily for over a year. It's very bright, I really like the diffuser Exposure use on their lights. Never used the Pelton mode. Tried the Braking mode for a while but always wondered if car drivers really associate the light getting brighter/flashing stopped with me slowing down.
They come with a 2 year warranty, are made in UK and can be sent back to Exposure (in the UK) to be repaired, if needed, so less chance of just ending up in landfill.
Only two things to mention - doesn't use a usb input for charging (never been an issue for me) and I have found its easy to knock when in the mount (plastic mount + metal light body), so sometimes I noticed it isn't directly point backwards. I also have an Exposure Trace daybright which I'm really impressed with. Would only ever buy Exposure lights from now on.
If you don't need the battery life of the Blaze then I would go for the TraceR. It also has the better mount.
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farewell
hippy
My bigger concern than the shape of the seatpost. Yours will be flat at the back, presumably to produce the same results as an aero tube 3x as long - camtail or whatever it's called, like the Trek and Cervelos used (https://en.wikipedia.org/wiki/Kammback and https://www.trekbikes.com/gb/en_GB/inside_trek/kammtail_virtual_foil/).
The Shiv seatpost is quite long, like double that of a normal aero road bike aero post, so the rubber bands get a workout trying to fit it.
Not so into dipping the lights. Braking maybe but the Peloton feature - does it dip the lights if a car is on your arse too? That would be less useful.