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CRF 250 Rear sprocket size?

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Does anyone know what the smallest rear sprocket that can be used on the 250X without replacing the chain? I believe my stock sprocket is 53T.

Just picked up some 17" wheels and I am looking to reduce the rpms on the pavement without having to replace the chain or front sprocket when converting from dirt.

Appreciate the help...

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Depending on where your chain adjustment is at, you may not be able to use a smaller sprocket at all if its already adjusted too far back in the blocks, i managed to go from a 53 to a 50 useing both extremes of the adjustment in the blocks. I have just put a 47 on the back (14 on front), and had to knock a couple of links out to get it up the front of the blocks. if you have a good chain you can use a 44 (or whatever size you want) tooth sprocket on the rear and use 2 joining links to add the length back in for the dirt tyres, not the ideal way to do things but if you're on a tight budget its a start.

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