Read the text on this page regarding the Phaltline tires on Tremor wheels:
http://hpiracing.com/newparts.php
They recommend P/N 87229 for converting the Savage to 17mm, which are the hexes with flanges. I think the hub opening on the wheel is large enough for the flange, or you can use the standard Savage 17mm hexes which come with huge flanged washers that cover the hub opening.