much bigger than I would like for a drop bar bicycle. Reminds me of the vintage SUV high mount 3rd brake lights you'd see on those old shows exploring Australia or Africa.
The tail light isn't very big. The battery weighs more than the tail light. I currently have drop bars. Bar type or wheel size has nothing to do with a tail light. Dinotte makes their products for people who ride rode bikes. Their brackets are designed to mount the taillights on the seat post.You can put the battery in a bag on the rack or even a pannier. My primary concern is to be seen hopefully even by people who are texting The position of the taillight was done intentionally so the view of it is not blocked from the rear.