There's actually 2 anime series that I've found that are based on cycling. The first one is Nasu, there's two hour long parts, one is based in the vuelta, the other at the japanese cup. It's done by some guys who worked at Studio Ghibli so it looks fucken awesome. The other one I found yesterday is called Yowamushi Pedal. It's not as good as Nasu, but still worth the watch for the awesome upshift moments.