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Gary Cook: As one-half of
the infamous Cook Bros., Gary and his brother Craig produced some of the
highest quality bike products during the 80’s. Was one of, if not thee,
first “high quality precision” part makers. Could be credited for
lightening up BMX a bit His company introduced many “firsts” for BMX,
such as built-in chain tensioners and a “A-Head’ish” clamp-on stem years
ahead of its time. With the selling of Cook Bros. (which still exists,
making mountain bike components), Gary has gone in and out of the BMX
scene, with CQP (Cooks Quality Parts), maker of a 2-speed system for
BMX. (from ababmx.com)
Craig Cook: The Golf Instruments
Company has a long and distinct history in the design and manufacture of
innovative sports equipment. With roots going back to early Southern
California car, boat, and dragster racing, three generations of Cooks
have designed, invented, and capitalized on California’s fanatical
enthusiasm for sports.
Craig Cook, Owner of Golf Instruments
Co., first learned about materials and design from his
perfectionist/inventor father, and after graduating from college with an
Industrial Arts degree in 1972, began Cook Bros. Racing. The company
pioneered. the sport of Bicycle Moto-Cross in Southern California with
their Alpine Mountain Bike, which was one of the first mountain bikes in
the world. (It is on display in the Mountain Bike Hall of Fame in
Crested Butte, Colorado.) Other innovative Cook Bros. Products included
sealed bearing BMX hubs and the 7075 billet aluminum crank arm. The
company is still a holder of two United States Patents for component
designs.
Continuing the tradition, in 1987 Craig
started a new company called C.D. Products producing a line of mountain
bike frame sets.
When golf became big business, Craig
turned his interests in materials and design to golf equipment and
started re-manufacturing a popular loft-lie gauge. Soon his new company,
Golf Instruments Co. was producing a complete line of loft-lie gauges in
three different styles. Their newest offering is a high-precision,
high-tech shaft puller for delicate graphite composite golf club shafts.
(from golfinstruments.com)
Cook
Brothers Cranks (from the Bike Pro catalog)
COOK
BROS. RACING CBR CRANK ARM SET
These cranks are
machined from solid pieces of 7075 T6 aluminum stock. Each of the arms
is turned on a lathe to produce the tapered shape, with a 37.72mm
diameter ball at the B/B and a 29.14mm diameter ball at the pedal end.
The ball shapes are then milled flat with the specific angles required
for the spider and pedal and B/B spindle installation. The pedal end
ball is drilled through and tapped with 9/16" by 20 threads per inch
threads for the pedal spindle. The crank arm dust cap hole is bored and
tapped with 22mm by 1mm threads, (no caps are provided with this crank
arm set). The square B/B spindle hole is milled with 2 degree tapered
sides when the rear of the arm is machined. The back side of the arm is
drilled and tapped for a Torx bolt that holds the spider to the rear of
the arm. The rear of the large ball has three steel pins driven into it.
These pins are used to fix the precise position of the spider on the arm
before the Torx bolt holds them together. The crank arms are high
polished, and then anodized. After anodizing, the Cook Bros. logo is
finely engraved on the face of each arm. The spider is machined from a
single piece of 6.63mm thick aluminum plate stock. It is cut to shape,
then drilled and tapped for the chain ring bolts where needed. The arms
have a 6 degree offset for chain stay and ankle clearance, and come with
a triple chain ring spider (adapter) with threaded inner ring bolt
holes. The chain ring bolt pattern is the standard 110mm outer, 74mm
inner. The crank arm set will work with any standard 2 degree tapered
bottom bracket, and naturally Cooks recommends their own sealed bearing
bottom bracket. The crank arms come anodized in Black, Purple, or Silver
with the spider anodized in Black. We stock them in 171mm, 176mm, or
181mm lengths. We found the CBR Mountain cranks to have a Bike-Pro Q
measurement of 168mm. Cooks CBR cranks come as right arm with spider,
left arm, and a set of five steel inner chain ring bolts with aluminum
spacers. Chainrings, the double chain ring bolt set, crank bolts, and
crank arm caps will be needed separately. The 176mm arm set with spider
in Black weighs 507.5 grams. The inner bolt set provided weighs an
additional 35 grams. Be sure to specify color and length.
Size-171-176-181 / Color-BK-L-S
COOK
BROS RACING RSR SERIES CRANK ARMS
The Cook Bros.
Racing RSR cranks are similar in style to the Cooks CBR arms, (the same
aluminum stock, 7075-T6) and are made using the same manufacturing
techniques, however there are some important design differences. The arm
dimension is slightly smaller in diameter, and they have a half-round
shaped slot milled down the back of the arms. The milling is to create
greater clearance for smaller chainrings, front derailleurs and
generally to produce a lighter crank. The left arm of the CBR set, in a
176mm length, weighs 224.5 grams, while the 176mm RSR left arm weighs
just 188.5 grams. The 176mm right arm of the CBR set weights 283 grams
while the 176mm right arm of the RSR set weighs 248 grams. The spider
has been reworked, having all excess aluminum milled away to reduce any
extra weight. This crank set is compatible with all 2 degree tapered
bottom brackets, and uses the standard 74mm and 110mm bolt pattern. The
crank arms are anodized in Blue, Black, Purple or Silver, with the
spider anodized in Black, and come in 171mm, 176mm, or 181mm. We found
the RSR cranks to have a Bike-Pro Q measurement of 167mm. Cooks RSR
cranks come as right arm, with spider, left arm and a set of five steel
inner chain ring bolts with aluminum spacers. Chainrings, the double
chain ring bolt set, crank bolts and crank arm dust caps will be needed
separately. The 176mm arm set, with spider, in Silver, weighs 436.5
grams. The inner bolt set provided weighs an additional 35 grams. Be
sure to specify color and length.
Size-171-176-181 / Color-B-BK-L-S
COOK BROS. HYPER-C MOUNTAIN CRANK ARM SET
A compact version of
the RSR arms is available, achieved by making the right arm with a
spider that has 58mm inner bolt pattern and a 94mm outer chain ring bolt
pattern. These Hyper Drive-C compatible arms are slightly lighter and
compatible with all 2 degree tapered spindle B/B's. They are also made
in Black, Lavender, or Silver anodized finishes, with the spider
anodized in Black. The Cooks Hyper-C cranks come as right arm, with
spider, left arm, and a set of five steel inner chain ring bolts with
aluminum spacers. Chainrings, the double chain ring bolt set, crank
bolts and crank arm dust caps will be needed separately. The inner bolt
set provided weighs an additional 35 grams. Be sure to specify color and
length.
Size-171-176-181 / Color-BK-L-S
 
COOK
BROS. PCH ROAD RACING CRANK ARM SET
Cook Bros. makes a
Road model of the RSR cranks using a 130mm bolt center diameter pattern.
Machined of 7075-T6 aluminum, the PCH crank arms are made using the same
techniques involved the RSR Mountain arms, and have the milled slot on
the rear of the arm. The PCH cranks are made anodized in Black, Lavender
or Silver with the spider anodized in Black. We found the PCH cranks to
have a Bike-Pro Q measurement of 160mm. The PCH cranks come as right arm
with spider and left arm. Chainrings, the double fixing bolt set, crank
bolts and crank arm dust caps will be needed separately. The 171mm PCH
cranks weigh 436.5 grams. Made in USA, specify color and length.
Size-171-176-181 / Color-BK-L-S
 
COOK
BROS. "E" CRANK ARM SET
The Cook Bros. "E"
series cranks are more traditional in their styling. They are machined
from 7075-T6 billet aluminum. Unlike the other Cooks arm sets these have
a rectangular cross section, not round, and the E cranks use a
replaceable, user installed spider. At the pedal spindle, the arm is
27.83mm, it reduces above the pedal to 18.5mm. On the left arm, at the
B/B spindle area widens to 37.5mm. The arms are 14.14mm thick at the
pedal spindle and thicken to 26.4mm at the B/B spindle. The right arm
has five round posts protruding from the back of the arm. These five
posts are drilled and tapped for the inner fixing bolts to anchor in.
The spider with the outer fixing bolt pattern drilled into it also
slides over these five posts. Custom aluminum spacers used with the
inner fixing bolts tighten down over the machined plate aluminum spider.
The right arm has four stubby extensions that the posts are fastened to.
The extensions lie perfectly over the spider. The posts incidentally are
positioned so that only a 58mm bolt center diameter can be used for the
inner chain ring. There are three choices of Bolt center diameter for
the spider, either a 94mm BCD or a 110mm BCD or a 130mm BCD. At the
moment, the arms are made only in a 175mm length, Cooks believes that
they may introduce a 181mm version in 1995. The arms come anodized in
Blue, Black, Grey, Lavender or Silver. The standard spider with the
110mm BCD weighs 47 grams, the 94mm spider weighs 34.5 grams. The
spiders are available in the same colors. We found the arms weighed
396.5 grams, and had a Bike- Pro Q measurement of 162mm. The inner steel
bolts and aluminum spacers weighed 38.5 grams. The E crank set comes as
right arm, left arm, spider, five steel inner fixing and the five custom
aluminum spacers that hold the inner chain ring and spider in place.
Chainrings, the outer fixing bolt set, crank bolts, crank arm dust caps
and will need to be purchased separately. Specify crank arm color,
spider BCD pattern and spider color.
Color-B-BK-GY-L-S
94mm BCD replacement spider Color-B-BK-GY-L-S
110mm BCD replacement spider Color-B-BK-GY-L-S
130mm BCD replacement spider Color-B-BK-GY-L-S
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