New Campagnolo Chorus Crankset Design Specifications:
Campagnolo
Crank Arm:
Since 2007 the Chorus Crankarm has followed the design and fabrication
techniques used in the more expensive Campagnolo Record Crankset
with one exception.
The Chorus Crank Arm uses a foam core to support the carbon fiber
exterior making it slightly heavier, but other than that it shares
the following characteristics:
- multi-directional carbon fiber used to create overall rigidity
in the design with an overlay of unidirectional fiber aligned
in points along this bicycle crankset that experiences higher
stress
- 5 arm spider totally integrated with the crank arm and cast
as a complete unit with crankarm and spider as a unit.
- the 5th hidden spider arm is fused to the back of the crank
arm to create a stronger overall design
- Ultra-Torque Design: a half axle is fused to each crank arm,
and joined at the mid point of the bottom bracket shell. (see
more info on
Campagnolo Ultra-Torque Crankset)
- the only metal used in this bike crankset is the embedded
nuts for the pedals, chainring bolt for the 5th hidden spider
arm and of course the integrated half axle
- 170mm, 172.5mm and 175mm crank lengths available
- requires Ultra-Torque BB overboard cups
Chorus Chainrings:
- both rings are made out of die cut aluminum plate
- steel rivets added below the teeth to help direct the chain
- ships with steel chainring bolts (vs alloy bolts for the Record
Crankset)
- chainrings use a 135mm bolt center diameter
- 34/48, 34/50, 39-52, 39-53 chainrings
- does not get the "anti-friction" coating of its
more expensive cousin
Note: that the 135mm BCD is
somewhat unusual for a road ring and does suggest that replacement
chainrings for the campagnolo chorus crankset must be campagnolo
chainrings.
Pedal Spindle Holes: 9/16" x
20 tpi threads
Q-Factor: This is the distance
between the pedals. The 2008 version of the Chorus crankset has
the same Q-Factor as it predecessor. Campagnolo has succeeded
in creating a crankset design with external oversized bearings
that unlike most bicycle part manufacturers did not imply an increase
in the lateral distance between the crank arms.
This is great news for those that hate to have to play with bicycle
shoe cleats to get them positioned just right.
Weight: Campagnolo™ Crankset
claimed weights
- 680 grams (not including BB cups)
- 55 grams for BB cups
Pricing: $350 - $450
Make
sure you know what comes with your purchase. The set of exterior
cups are typically about $20-25.00 and some suppliers include
them in the price and some do not.
Note: so if you intend to buy bicycle parts online like the Chorus
Crankset look for the "Carbon" in the name to indicate
the newest in their carbon forming technology. Look for the "Ultra-Torque"
or "UT" in the name as well to indicate that it is using
their newest split axle design. Anything else is old bicycle part
stock, still great to buy but it should be reflected in the price.
A few sites are advertising the "Campagnolo Chorus Carbon
Crankset" for $440. and it is NOT the Ultra-Torque bicycle
crankset version... you still have to buy the BB and axle... Why
not buy the newer UT version for the same money??
Older Models:
- Campagnolo Chorus 10s crankset, with aluminum alloy arms,
with square tapered holes for standard 2°tapered spindle.
- Campagnolo Chorus Carbon Crankset: same as above but with
the carbon crank arms.
New Campagnolo Chorus Crankset: Review Basic
Installation of Ultra-Torque Crankset
- It is important to have your bottom bracket shell shaved square
at a qualified bike repair shop before you install the cups
- An external cup gets screwed in from either side. Making sure
that the thread of the cups matches the thread of your bicycle's
bottom bracket shell
- Each half axle of the ultra-torque crankset is threaded through
the center of the bottom bracket shell and a 10mm bolt is used
to hold the two halves of the crankset together.
- Bolt gets torqued down to 42N
Further Information:
Campagnolo Bike Parts
Index of Campagnolo Bicycle Part Articles
