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Divide your rear sprocket into your front sprocket. Like 25x9. 25 divided by 9 = 2.77. so 2.77 to 1 is the drive ratio. If you go with a smaller sprocket like a 24 in the front but still a 9 in the back, you are lowering the gear ratio to 2.66 to 1. So your bike will be slower but easier to pedal.
If you go with a 25 in the front and a 10 in the back, you end up with a 2.5 to 1 ratio.
Don't confuse gear ratio with gear inches, that's a calculation including the wheel and sometimes the circumference of the tire.
What else can I help you with?
Will a bmx chainring sprocket fit on a mountain bike i have a carrera vulcan and i just want it all single speed and i have a bmx eastern sprocket will it fit?
It will if you have bmx (or bmx style) cranks.
BMX Would a 28T sprocket work with a 14T freewheel?
Of course it will, but in my opinion freewheels arent the best
Can you put a 23 tooth sprocket on a mongoose bmx bike?
Not a sprocket only, but you can buy a 23-tooth freewheel that should fit.
How do you remove a crank and sprocket on a BMX without the Allen key hole?
i would assume you have cranks with a built in sprocket, if this is the case, you can't
How do you fit a bmx sprocket?
the easiest way is to go to your local bike shop
How do you put a 9 tooth back wheel sprocket on a bmx?
change out the hub
What is the chain and sprocket sizes for a Yamaha RXZ?
Sprocket size will b 16T & 39
What is a freewheel bmx?
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.
If i change the size of a sprocket on a bmx bike will i have to change anything else?
You might have to either lengthen or shorten the chain, depending on if you're getting a bigger or smaller sprocket.
What bmx is suitable for 16 year olds?
Bmx's don't come in sizes. They are all one size.
What is the chain and sprocket sizes for a suzuki gs750?
630 pitch, 96 links
What is the smallest size sprocket for a bmx you can get without getting a casset wheel?
Guessing an 11T cog (sproket), maybe a custom 10T.
