Ted E. Baer wrote:
>
(cut)
> Here is another twist to these cranks that I found: I noticed that some of
> these crank arms have a tiny hole drilled through the center of the pedal
> cap; possibly so as to prevent air pockets or excessive grease from popping
> the cap out? It would be my guess that this would have been the first
> revision to said crank arms.
Yes, I'd agree, the little hole was to relieve hydraulic pressure so the cap didn't pop off.
Pedal threads before aluminum alloy cranks were shorter because steel cranks did not need to be as thick. With the arrival of alloy cranks, pedal threads eventually got longer. In other words, if you use pedals with the later longer threads, part of the threads will stick out the back of steel cranks.
Chuck Schmidt
South Pasadena, Southern California