Aprilia RS4 50
Cool 50's, nothing like them. Shame they aren't as popular anymore due to learner laws. Either way didn't realise that Aprilia made a new RS50, the RS4 50. At least it's a 2-stroke :) Looks proper trick with radial brakes. Shame they made the exhaust look like a 4 stroke (assuming they wanted to mimic the RSV4)
We'll do a post on all the cool 50's available still soon.
Check out Aprilia's page about it.