Bike in Gramado

So, it turns out you can also rent a bike to go around. They say the rental is R$37,00/day and that you can reserve it online. The only problem is, at least in my computer, you can not pick the dates from their calendar. So I guess you're better off calling, or just going there.
http://viajargramado.com.br/estabelecimento/eko- bike-center