>>647
何十年も前に通った道だ
https://www.sheldonbrown.com/brandt/reflective-tape.html

>Placing reflective tape on the inside of the rims between the spokes is highly effective for night riding
>because it is visible equally to the front and rear while attracting attention through its motion.
>It is most effective when applied to less than half the rim in a solid block. Five inter-spoke sections do a good job.

１５cm から半周が一番目立つって