Cannondale Bicycle Corp. 05016 C HI PERF ROAD SI vs Dura Ace 1 Page 1
Cannondale Technologies Manual - 2005
2005
PDF
R&D Stiffness Testing : SI vs. Dura-Ace
Crank Tested
Weight w/BB
(g)
Stiffness Index
(g/in)
Stiffness-to-Weight
Ratio
Results Compared
to Dura Ace
Cannondale
SI Hollowgram
660
939
1.42
10% Stiffer
85 grams lighter
Cannondale
SI Carbon
734
855
1.16
Equal Stiffness
11 grams lighter
Shimano FC-7800
Dura-Ace 10 Speed
745
854
1.15
-
Our R&D engineers test all cranks same way. We restrain the crank with the 39T chain ring (not the 53T), and
apply a load through the left hand crank instead of the right hand crank. This method captures data for four
areas of critical crank system performance:
1. The bending and torsional stiffness of the left crank arm
2. The interface between the crank arm and the spindle (at both ends)
3. The torsional and bending stiffness of the bottom bracket spindle
4. The torsional stiffness of the spider
HI-PERF ROAD - SI CRANKS
05016C
200 Lbs
10/04
