hi all, i have a barracuda oblivion that my brother striped and now im trying to put it back together and fix it.

before it was stripped, when pedaling the pedals would come loose then fall off unless tightened.

if i hold both pedals the bottom bracket moves when i lift or push down on the pedals.

am i right that i need a new one?

do they come in different sizes? what part do i need to measure if i take this apart to get a new one?

sorry im new to this

thanks in advance