Originally Posted by
nightrider13
Hello! Thanks for your reply. I dont really understand "
completely unsealed and really only intended for track use", could you explain it more further? Cheers and thanks! 
Rain, dirt and mud can get into the bearings from the gap between the spindle and the cups. They leave out the seal* to reduce friction.
By seal, I mean the little rubber or plastic bit that prevents water intrusion. NOT a semi-aquatic marine mammal. You can't get one of those with a BB for less than $200.
Oh and certainly not Seal, the British singer and song writer. You don't get that either.