You need a special tool called a chain whip to keep the cassette from turning, then you need another special splined socket to undo the lockring. Once the lockring is off the cassette can just be lifted out. www.bicycletutor.com probably have a video to show you how. Otherwise there's always www.parktool.com and www.sheldonbrown.com to turn to for help
No because the bike would brake evry time so no
A bike cassette is a stack of differently sized sprockets that are stuck on to the rear hub, giving the rider a range of gear ratios to choose from.
Yes you can. It has 25x9 gearing. That means it has a cassette in the rear wheel. Eastern cassette's click very loud if you are into that sort of thing.
On the front it's usually called a chainwheel or a chainring, on the rear it's either a sprocket, a cassette, or a freewheel.
I don't think you can change your bike.
It drives the rear wheel. Used on newer/more expensive bikes instead of a freewheel.
Diva.
No. a 9T sprocket will only fit a cassette hub, and not freewheel hubs.
There is a casette player through Sony that offers a automatic switch changer which automatically switch the cassette without you having to change them manually.
Probably. Today BMXes can have either a freewheel hub or a cassette hub, but as long as you stay within the hub type you can move parts from one bike to another.
le cassette = the cassette / the tape / the cassette tape
You can not change a dirt bike's VIN number. You can change the racing number by contacting the race officials.