Joe here with a bleg. I have a friend coming to visit who is a bicyclist and I’m wondering if there are any places that rent good bikes to use on one of these bike roads

Yūka Family Road (Kumamoto City to Yamaga)
Kumagawa River Cycling Road (Hitoyoshi Station to Yunomae Station in southern Kumamoto)
Milk Road (Aso)

According to this webpage

https://www.welcomekyushu.jp/cycle-in-kyushu/en/courses/detail/38

There are 6 rental places for kumagawa, so any info you have is appreciated!!