In the latest issue of S'Phile Mikey, in the course of reviewing the 9" version of the Kuzma 4Point arm, declares the inherent superiority of 9" arms on the basis of less moment of inertia and higher rigidity. He has made such references in the past. I have no doubt he believes this but I am surprised that he cites to theoretical aspects only, and that his beliefs defy the historical collective consciousness of thousands of vinyl enthusiasts. I fully understand and accept that errors in cartridge alignment become magnified with a 12" arm but the difference that 1.5 or 3 inches of tonearm can make in relative moment of inertia would seem minuscule and Mikey's citation to stereo grooves and horizontal and vertical compliance causing minimum moment of inertia to be critical regardless of how flat the record is seems far-fetched. In my. case, I just ordered a 12" Reed 3P in cocobo from the importer and while talking to him, I was informed that he can't recall the last time he sold the 9" version of that arm and he frankly has no idea why Mr. Triukas even offers the 9" since the 10.5 and 12 far outperform it. I have no regrets going with the 12". For starters, a 9" will not accept an outer ring and I use one. But my question is; is Mikey as wrong as I think he is?