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354 Posts
I am using my first outboard-bearing crankset: a DA 7800 model. Before it was always a Campy BB and crank. I have about 1000 miles on the cranks so far, and last night I took them apart. I noticed that with the chain dis-engaged, there was much more drag on the bearings than on my Campy crank. For example, if I spin the Campy crank, it will probably go around 3-4 times before stopping. The DA crank was about 3/4 of a revolution with a similar push (of course, this is not a scientific method of testing).
When setting preload on the Dura Ace crank, am I doing something wrong? I put the non drive-side arm on, and used the big torx-like preload screw to tighten it up snugly hand-tight, then tighten the 2 retainer 5mm hex bolts to 10N-m.
Is there something wrong with my cranks, or is there just more drag on this system than, say a Chorus BB/crank?
When setting preload on the Dura Ace crank, am I doing something wrong? I put the non drive-side arm on, and used the big torx-like preload screw to tighten it up snugly hand-tight, then tighten the 2 retainer 5mm hex bolts to 10N-m.
Is there something wrong with my cranks, or is there just more drag on this system than, say a Chorus BB/crank?