2008 crf250r sprocket

hey guys i have a 2008 crf250r and i am going to be buying new chains and sprockets and was wonder what the ratio is from factory? i also want to know if i should try a new ratio? I race some supercross but mostly motocross. what ratio should i go with?

the stock raito is 13/51 i think.

if you are racing SX and MX stay with that

ok thanks that is what i thought but was not sure.

thanks.

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