Originally Posted by
FBinNY
Hillrider is right, 6u or narrow 6 freewheels use 7s spacing and were made to offer 6 gears in the width of 5 for older 120 hubs. 6s or standard 6 has the spacing of 5s and is roughly the width of a 7s freewheel for 126mm hubs. (I've sold enough of these to know, and still have a bunch of 6u freewheels if anyone wants one).
Of course individual hubs may vary which is why I usually tell folks how to measure for themselves rather than publish 2nd hand specs which are prone to misprints and typos.
Here it is again, note the markers I added regarding "A":
Regular 5 and 6 Speed
A = 29.00mm for 5 Speed
A = 35.00mm for 6 Speed <<<<
C = 120.00mm-122.00mm
Narrow 6 Speed, 7 Speed and 8 Speed
A = 31.00mm for Narrow 6 Speed <<<<
A = 36.00mm for Narrow 7 Speed
C = 125.00mm to 127.00mm
No "au contaire" needed...
=8-)
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Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life