10" to 12" rear

i have a few questions about switching my upc 125 experts rear wheel from a 10" to a 12"

how many teeth on the rear sprocket will i need to add to keep the same gearing ratio?

and what is the size of the wheel bearing? ive seen 12mm and 15mm.

if i buy just a wheel and tire, will i be able to use my stock disc brake and hub, and sprocket hub?

thank

jeff

anybody?

i would go down 1 tooth on the counter shaft first ...should get you pretty close.

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