[rodar y rodar]

Google doesn`t know the story- does anybody here know ?

 

[Bikinfoolferlife]

When in doubt check Sheldon Brown, maybe this helps http://www.sheldonbrown.com/26/index.html

 

[rodar y rodar]

When in doubt check Sheldon Brown

Well, that`s my general motto for all things bike related. But in this case his answer is pretty vague.