A review of the literature on the hour record suggests that successful attempts on this record usually are based on an average cadence of 105-110 RPM. Whether this historical average translates into a solid recommendation for most riders, though, is open for conversation; it would be useful if it were possible to do a systematic physiological analysis of athlete variables of those who set an hour record.
There are outlier performers on either end of the cadence scale
and to say that a 100-110 cadence = fast times based on the performance of two
(albeit) talented athletes doesn't make an argument. Ullrich and Gonchar were
two accomplished TT riders who had much slower cadences than Armstrong and
Cancellera (and Lance's fast cadence didn't hold good stead 2009's TDF TTs,