To be the fastest, you want lightweight products, and at 133g the MXR BB is just that. This lightweight Euro bottom bracket has threaded CNC alloy cups, alloy spacers and 4 high quality sealed replaceable cartridge bearings.
 
Euro Type 68mm BB shell (BSA)
19mm axle compatible (axle not included)
Variable, adjustable chain line.
4 replaceable sealed bearings.
Alloy CNC cups and spacer kit
Weight:133g