Gearing ?'s

I now have an 07 YZ450F and would like to re-gear for trail riding. I was told to change the rear from a 49t to a 50t, but don't think this will help enough.

My old 06 WR250 had a 13t front and 53t rear, but of course the transmission was different.

Can any of you tell me the transmission ratios for each gear on a 5-spd WR so I can use this info to help me decide which sprocket I should get with the closer ratio tranny of the YZ.

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