Not a sprocket only, but you can buy a 23-tooth freewheel that should fit.
There are two different hub designs for BMX, freewheels and freehubs. You need to know what you have if you want to replace the sprocket by the rear wheel.
You can get a 9 tooth sprocket, you will need a conversion kit to do it. Haro makes a decent one just do a search for Haro 25/9
As far a the sprocket in the front goes, i think they make them as small as 22 tooth, and in the back, it is called a freewheel or a driver. Freewheels are generally larger and drivers are smaller. Drivers can go as small as 8 teeth i beleave.
It will if you have bmx (or bmx style) cranks.
No. a 9T sprocket will only fit a cassette hub, and not freewheel hubs.
Two, but this is not the same as how many speeds the BMX bike in question has. A BMX bike has a sprocket in the front, and a cog in the back and each is a gear, but is considered a single speed bicycle because two gears and a chain are required for transmission of rotational force from the crankset to the rear wheel.
Guessing an 11T cog (sproket), maybe a custom 10T.
In the drive train you have the front chainwheel/ring and the rear sprocket that both engage the chain. The pointy bits on sprocket and chainwheel which allows the chain to grip are called teeth. The ratio between the tooth counts is what determines which gear ratio the bike has.
take the cranks off and then take your old sprocket off and then put the new one on and then put the cranks back on.
bmx fakieRide towards a wall slowly, when your front wheel hits it push backwards while pedaling. Keep your weight central to keep your balance. Be carefull not to lean too far back or forward whilst fakieing, as it is harder to keep your balance. Keep your body inline with your sprocket and just pedal back. Good luck!Or just use a flatbank...
Yes...this is the most comon gear ratio on bmx's. this is because it allows a good balance of accelration and top speed while still giving you the clearance to be able to roll into most quarter pipes.