First you need to be clear about what you're talking about.
In regular Bike-speak, sprockets go at the rear, and chainrings/chainwheels go at the front.
In BMX-speak, a sprocket goes at the front, and a driver goes at the rear.
If you're speaking BMX, a small sprocket will increase the ground clearance.
Better if you're riding ramps as there's less risk of the sprocket/chain hitting the lip as you drop in.
For speed it doesn't matter, as long as you pick a driver with a suitable tooth count.
If you're not riding ramps, well, a smaller sprocket is still lighter, which is a kinda-sorta advantage.
The downside is that with a smaller sprocket, you will have to use a smaller driver. And the smaller they get, the faster they wear. And the chain wears too.
Small sprockets reduce the weight of your bike so that's always a plus. Also a smaller sprocket doesnt get in the way and they look cooler :)
Look closly at the sprocket and you will see a small dot or indentation,you align both dots (cam and crank sprocket dots)
Big chainwheel(by the pedals) and small sprocket(at the rear wheel) = big effort. Small chainwheel and big sprocket = small effort
Normally that indicates a worn out sprocket. Replace and you should be OK.
Larrge at the front and small at the rear
well if you have a 8 tooth rear driver you will need a 23t sprocket, if u have a 9 tooth rear driver you will need a 25t sprocket, if u have a 10 tooth rear driver you will need a 28t sprocket, and if you have a 11 tooth rear driver you will need a 30t sprocket
remove bar, chain there should be a small cover over the drive sprocket, held on woth a screw, remove cover, then there should be a screw or bolt holding the sprocket on, remove that, pull old sprocket off, replace it in reverse.
a 9 will do but an 8 would be better
First you need to be clear about what you're talking about.In regular Bike-speak, sprockets go at the rear, and chainrings/chainwheels go at the front.In BMX-speak, a sprocket goes at the front, and a driver goes at the rear.If you're speaking BMX, the most obvious difference is the size, the tooth count.For the same size driver, a bigger sprocket will make the bike slower off the start, but give it a higher top speed.For the same size driver, a smaller sprocket will make the bike quicker off the start, but give it a lower top speed.If you change the driver to match, start and top speed will remain the same, even with a smaller/bigger sprocket. A small sprocket will increase the ground clearance. Better if you're riding ramps as there's less risk of the sprocket/chain hitting the lip as you drop in. If you're not riding ramps, well, a smaller sprocket is still lighter, which is a kinda-sorta advantage. The downside is that the smaller they get, the faster they wear. And the chain wears too.
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.
with a bigger rear sprocket u will be gearing down. therefor u will have better takeoff but lower top speed.
Depends on if you're looking at the wheel or if you're looking at the pedals. 1st gear, the one where pedalling is easiest, is the biggest sprocket at the rear, and the smallest chainwheel at the front.