Well, Speed Kult list is always fun, so this is a good choice.
You have a good basis here (in terms of models), so I would only suggest some minor changes just to distribute points.
Firstly,
HQ:
While Painboy is good here and helps your bike unit, your warboss at such low points is better with a blob of 20-30 footslogging boyz, not on a bike.
Also you do not have a lot of points (only 500), so my suggest would be swap both
HQ's for one
KFF Big Mek on bike. It will cost 110 points.
Next - troop choices. Truck boyz is really one and only unit, that fully fits in your Speed Kult/bikers theme. So, just give 'em
PK nobs with bosspoles to strengthen them.
2 x 9+1 Boyz (
PK;
BP) in Truck costs 260 teeth.
Finally, the bikers.
Nob dudes are too expensive, so take regular bike boys and give 'em some bodies instead. Five will be enough. Anyway, you do not have enough points for more, har-har. And dont forget
PK nob.
So, 4+1 Warbikers (
PK;
BP) for just 130pts.
Hope this helps.