On Tuesday, March 15, 2016 at 9:29:42 AM UTC-4, wrote:

Maybe that has something to do with the need for a different size?

Mpfffff... Let's get down to it.

The most likely reason the two similar-function parts are of a different size is that the physical parameters of the entirety suggested/led to this decision. As neither have *one damned thing* to do with the actual tape speed, the reasons may be no more complex than that.

Peter Wieck
Melrose Park, PA