there pitpro copies of a scorpa six (or sik) tricks bike ,the scorpa (famous for trials bikes) is a really good bike rides similar to a bmx and contains a pumped up jailing motor.That is a pit pro version however is very similar to the scorpa and still would be unbelievably fun to ride ,you can do anything on them
Hers the home page for the Scorpa 4Tricks I understand just looking at it you would think those rims are weak but I think you'll find they are very high quality and would buckle that quick and the tyre are a trials compound and run low presure(as trials tyres do have a look at a video of a trials rider and check out the tyres on their bikes) so traction won't be an issue.
BIT Scorpa The Hell Team-4Tricksbikes