A Bike Gran Turismo.
Got this game yesterday and was initially impressed by the graphics especially the replays but like everyone else says, it does need more tracks. You do get certain bonus items for things like overtaking 15 riders in a race but this isn't difficult when you start from the back and there are 20 in front of you. Not sure what these are yet but looking at the other reviews I'll bet they're not hidden tracks.
It's worth buying if you're a fan of racing games but fancy a change from all the driving games out there which, although varying in quality (Gran Turismo 3 for example) can be a bit samey after you've played them for several hundred hours. Its a good game of course. I like gran turismo. This is great :P
I would have given this five stars but for the lack of tracks, otherwise, top game. Go and buy it.