Hello all, I've had my F5 for about 6 months now, nice ride but it's time to make some changes. I'm looking to change my X5 components to a mix of X9/X0.

First question, when I change the crank set, do I change the BB too if so what kind should I be looking for?

Second question, what can I expect to pay for a for Lefty PBR 100mm?

Thank you in advance.