The Extremum RacePrep bottom bracket is the first external BB designed for BMX racing. Unlike mountain biking where bikes are exposed to mud and water, BMX racers typically ride in relatively clean environments (dust not withstanding). To protect against the gunk and grime mountain bikers ride through, designers add layers of seals to bottom brackets. While the seals protect the bearings, they also add drag. For this reason the Extremum RacePrep bottom bracket features non-contact, titanium-coated SUS bearings, modified low-friction seals and lightweight lube. The titanium coating results in a low friction coefficient, increased corrosion resistance and smoother rolling bearings.
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