Bike produced over many years and multiple versions, which specific one do you have?
It's a 2011 Superfly 100, Full suspension.
Unless you are doing a lot of DH, not much, knowing what you have now would help, would suspect the frame can't take any more than 180f/160r
This is relative. Over the course of a 24 hour race, I may climb (and descend) around 16,000 feet.
This should answer this question
Brake Pads - A break down of what you need to know - Pinkbike
Thanks!
What do you currently have? Generally, you can't upgrade brake levers, as they are part of a system, the only way you can, is if you keep with in a single brand and generation within that brand, then you need to look into cost effectiveness. For lever adjustment, Shimano current SLX up have this as an dial on the lever