Box Extremum Race Prep External Bottom Bracket

Box Components

$99.95 

Box Extremum Race Prep External Bottom Bracket

For years, pro BMX racers have modified their bottom brackets by removing the seals and replacing the grease with oil. This results in free-spinning cranks, but also significantly shortens the life of bottom brackets. 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). 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. The result is a system with less drag and a level of bearing protection more in line with the needs of BMX racers.
SPECS
FRAME FIT- Euro
CRANK FIT- 24mm, 2 piece, SHIMANO Hollowtech Style - SHIMANO DXR, CRUPI RHYTHM, DK FLASH, SINZ ELITE XXX, CLIQ and many more
BEARING- Titanium coated SUS bearings, low friction seals and light weight lube for fast spin and minimal drag
HARDWARE- Forged Aluminum cups, integrated internal spacer, 3 aluminum color matched cup spacers
 
Weight:
3.45oz/97.8g

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