Velonews compared the drag of different types of derailleur pullies in the late 80's or early 90's, including Bullseye and Campy.
Their testing showed that the Campy plain bush pullies actually had less drag than the Bullseye, even though BullsEye used to have ads claiming that using their pullies was equivalent to eliminating so many feet of climbing per ride.
I think that the seals on the Bullseye pullies introduced more drag than the ball bearings saved. Bullseye pullies were probably more durable on the other hand than the Campy bushings would be.
Eric Goforth Durham, NC USA
On Sat, 26 Jan 2008, Bill Talbot wrote:
> CRers,
>
> Any thoughts on just why the trasition from ball bearing to sleave style be
> arings happened in the 60's? Was it strickly driven by price/profit margin?
> Even on the high end changers where "price is no object", they switched to
> the inferior style. Campy, which many consider the standard, switched betw
> een the Record and Nuovo Record in 1967.
>
> Who was the last manufacturer to make the switch? What year? Bullseye and o
> thers came to our rescue not that long after with their nice alloy sealed b
> earing replacement pulleys.
>
> Bill Talbot
> New Hartford, CT USA
>
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