Dobbsy wrote:
Well I would imagine that riding the weight of a bike into someone's shins constitutes the good CC stat

but I'm in the opposite boat regarding FF as I feel the FF value (and theory) of handlebar mounted Bolters to be ludicrously inaccurate - but who am I to debate reality in a fantasy/Sci-fi setting?

Well... reality and GW don't really have much of a connection.
The entire concept of a two wheeled vehicle being used in any meaningful way in a combat role is absolutely ridiculous. Besides the obvious terrain issues, and tire issues, ramming is completely out. Unless hit dead on, a minor hit to the sides of the front wheel, or a small jolt to the handlebars at all but the lowest speeds, will result in a crash. The fairly static profile makes them a much easier target, unless going at very high speeds, where even a slight change in balance, will result in a crash.
Even as a 'firefighter', aiming the bolters while maintaining control would be difficult at best. It'd be like firing a gun with your feet. Sure, it can be done, but any sense of accuracy or control is out the window. The close combat approach seems the most effective means of doing more damage than actually walking. And even then, you better hope your weapon cleaves through the enemy at about what you expect, else you'll over/undercompensate, and will result in a crash.
Bikes are fun. Bikes are economical. Bikes are not inherently stable except at high speeds on tarmac. Bikes at high speeds on tarmac don't take even minor external changes well. Bikes at slow speeds are bloody hinderingly awful. Minor incidents at slow speeds are hugely inconvenient. Minor incidents at high speeds are hugely dangerous.
That a Biker in 40K is in any way combat effective, is laughable. But what do I know, they look 'cool'. Dakka dakka Waaagh! Whatever.
Morgan Vening