Thanks VS, dgoran
TW University takes measurements of head width and beam thickness. You can access the info in the "spin window" section of this tool: http://twu.tennis-warehouse.com/cgi-...ker.cgi#output
They've got the IG Rad and I Rad Pro as being almost 1/4" narrower in the head than the Liquidmetal Rad at 10&2. Comparing photos it kind of looks that way to me too. Could be bad data and my eyes could be deceiving me.