Here's my product review.. for a crank released in 1993.
These were the last square taper Dura Ace cranks and are known for their narrow tread AKA 'Q-factor'
. I have always liked a narrow pedaling stance and was intrigued to try these on a modern 11sp drivetrain.
And the elegant shape has really grown on me - the slender curves for lightness and bringing all your massive soul-crushing forces in toward the center of the bike.
With a Phil 103mm BB mine have a 138mm q-factor, and a 118mm width at the center (the 'u-factor' measurement for heel clearance). Compared with the Super Record ti cranks that are narrower than most, but measure 145.5mm and 128mm.
The narrowest current production cranks I know of are Extralites; about the same as the 7410s at ~138mm but with a wide U-factor that may actually exceed the SR cranks.
Here's are some published numbers from BB30 cranks:
And then weights:
604g for the arms plus Phil ti BB, alloy cups, and alloy crank bolts. And a complete crankset with 53/39t rings and alloy chainring bolts they are 743g. (vs 638g for the full SR set). Stiffness is probably about as impressive
and then a stiffness-to-weight number way down in the basement showing the 20 years' lag in technology.
But nevertheless I'm in love. Thanks for retrogrouching with me this far. More to come.
the problem? could be the nut behind the handlebars.