Bmx Gear

Just recently returned to riding again and I wanted to change to a smaller gear set-up. I am a hub prices 9t / 25t wheel with pedals, but wondered if the holes line up with my 3-piece cranks the old configuration?

in most cases you will not have to buy new cranks
but if you've got some funky cranks and eventually

ive never been a problem if

I think if u have 3 piece cranks that u need a spocket spiecal (gear), but perhaps not.

Hope this helps