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x
X X
X
X
364
Black
Red
Blue
Gold
Weight
List
91-9002K 91-9002R 91-9002B 91-9002G
100 grams
$99.99
Black
Red
Blue
Gold
List
91-9014K
91-9003R 91-9003B 91-9003G $54.95
BOX EXTREMUM BB
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.
EX-1 BB
EX-1 External bottom brackets feature cold-forged and CNC-
machined alloy cups, dual-labyrinth bearing covers and precision
sealed bearings. They are the perfect match to Promax CF-2 and
HF-2 cranks and ultimate upgrade to the budget BBs sold with
most crank sets.
Black
Weight
List
91-9003K
105 grams
$54.99
Box Two External bottom brackets feature cold-forged
and CNC-machined alloy cups, dual-labyrinth bearing
covers and precision sealed bearings. They are the
perfect match to Promax CF-2 and HF-2 cranks and the
ultimate upgrade to the budget BBs sold with most crank
sets. Box Two External Bottom Brackets are designed to
fit all 24-millimeter crank spindles and frames with 68 or
73 x BC 1.37” bottom bracket shells.
BOX TWO BB
RACEWEAR
GLOVES
FOOTWEAR
HELMETS
HELMETACC.
EYEWEAR
PROTECTIVE
WEAR
CASUALWEAR
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HYDRATION
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&PARTS
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INDEX
BOTTOM BRACKETS
FAX: 24 hours a day 1-800-326-3813