To make the wheels spin easily.
Yes
You can remove bearings from a BMX frame with a 'mid' bottom bracket without damaging them using a 3/8s rachet extension.
It depends on your hub. If it's unsealed, then the ball bearings have different diameters - you just need to find out which size you need. That's fairly easy. If it's sealed, there is going to be a number on the side of the seal - usually a 4 digit number starting with a 6. That number identifies your bearing dimensions, that's the bearing size you need.
No. Skateboards and inline skates all have cartridge bearings, while a lot of bikes have cup & cone bearings. For those bikes that do have cartridge bearings, their axles are thicker than skateboards/skates.
SKILLS!!
To ensure the longevity and optimal performance of BMX bottom bracket bearings, regularly clean and lubricate them, avoid riding in wet or muddy conditions, and periodically check for any signs of wear or damage. Additionally, make sure to properly tighten the bottom bracket to prevent any issues with the bearings.
Wheel bearings, main bearings, connecting rod bearings, cam bearings, axle bearings, carrier bearings, pinion bearings and so on, need to be more specific.
Basically you need a BMX and somewhere to ride it. Helmet, maybe some pads and gloves would also be nice.
Sealed just means that water and muck can't get into it. Integrated means that the bearings sit pretty much directly in the frame. Regular headsets first have cups that sit in the frame, and then the bearings rests in the cup.
Wheel bearings? Axle bearings? Differential carrier bearings? Engine main bearings? Engine rod bearings? Engine cam bearings? Need more info to help you.
They come Krunk K2 bearings!
To race BMX, you'll need a BMX bike specifically designed for racing, which is lightweight and durable. Safety gear is essential, including a helmet, gloves, knee pads, and elbow pads. Additionally, it's helpful to have access to a BMX track and a basic understanding of racing techniques and rules. Joining a local BMX club can also provide support and resources for new racers.