These BBs have contact seals. If the BB turns smoothly with no gritty feelings or binding, then you are just experiencing seal drag, which will diminish with time.yarsec said:I just installed a new Truvativ Team SL ISIS Bottom Bracket. The bearings feel really tight. Is this normal for a new BB? Will they loosen up after a few miles? The cranks will not spin freely more than a half of turn.