How do i lower my sprocket ratio on a bmx bike?

jaezen55

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Jan 3, 2010
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Aight so i have a 30/11 or something like that
I want to go to 25/9
I know i need to get a 25 tooth sprocket
and a 9 tooth freewheel
Does the free wheel matter?
like can i get any brand and it will work for it?
Sorry not freewheel. Driver
 
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