Picked up a Torker Freestyling today and needs a BB but i don't know what size. I've seen a sealed BB and the seller says it's a 24tpi and not a 28tpi and i haven't a clue what that's all about
![Huh ???](http://www.radbmx.co.uk/forum/Smileys/smilies/huh.gif)
Don't know what the pro's and con's are for sealed/unsealed TBH
Any help would be appreciated
Lamby