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"It will only fit round seatposts, though, so if you have an aero model you'll need to buy the specific clamp from Exposure."
I have one with the standard mount on my Sl7 'aero' seat post. The issue with said 'aero' seat post is the back is flat. So neither this nor the standard one are technically suitable. With that said, it stayed put over some fairly dodgy terrain without issue. Obviously the rubber stretch job has enough friction to stop it twisting.
Can confirm that the Blaze Mk3 is suitable in your face. I like the 'braking' function too with all the fancy accelerometer stuff built in.And thanks @spinnnout I do have a Speech saddle. This will be perfect to avoid the aforementioned bodge.
yeahdext-
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.
hippy
"It will only fit round seatposts, though, so if you have an aero model you'll need to buy the specific clamp from Exposure."
https://road.cc/content/review/252238-exposure-blaze-mk2-daybright
Mk3: https://road.cc/content/review/253186-exposure-blaze-mk3-reakt-and-peloton
"The MK3 gets the same 1,500mAh lithium-ion battery as the MK2 ReAKT, and the only change is the addition of Peloton"