Hola si tienes una bici que te sobre por madrid centro yo paso y te quito el problema jeje un saludo
nolotiro.org is a website where you can give stuff for free or find free second hand stuff: furniture, chairs, bicycles, computers, laptops, tables, beds, clothe, toys, mobile phones and many other stuff you don't want or need, so other people can recycle it and give it a new life.