what kind of tire size does a honda 250 use?

Answer 1

250 what? They make at least 6 different ones right now, all of which will use different tires.

Over the years, they've made dozens.

So you'll have to be more specific.

Answer 2

Always give year, make, engine size and model # when asking questions. We need all of that info to give an informed answer.
Check it out for yourself
http://www.mrcycles.com/

Answer 3

why don't you measure it