Very nice integration, I managed to find my way around both the site and UBB easily thanks to the common menuing. You also have an original colour scheme, something that's a little harder to find nowadays.
May I suggest one change? Try using more motorbike-related images with the UBB, such as post notification icons. Remember to make them about the same size as your existing ones, and make sure they fit in with the colour scheme.
You have a very promising site there, good luck with it in the future
