For kicks one day I carefully measured several wraiths, surges, trespasses, destroyers, forces, xcals, bosses, DD2s, and nukes with calipers and the results were:
wraiths, surges, trespasses: ~2.13-2.16 cm
destroyers, forces, xcals: ~2.27-2.31
nukes, bosses, DD2s: ~2.46-2.49
If I measured well (tried my hardest) then you should be able to estimate the true rim width of the scorpius based on feel. My guess is the disc is 2.3 and the pdga measured it .1cm wider just as they measured the destroyer .1cm thinner. Watch out though, everyone there with me was convinced the DD2 was a 2.3-2.4 rim and it was a 2.5 rim just like the nukes and bosses (just as the pdga measured, suprisingly) but it felt much better in the hand because it has a blunter/rounder edge.