Yes, because the tire diameter numbers are not that far off between all the combos. I think anyone running stock springs in front and too much preload in the rear will encounter issues with stability. I think there is some inherant design issue with the 908 front that causes some issues as well. I'm about to run an MT21 front and a 908 rear. My front springs are .50 straight rate. I've run scorpions f & R, scorpion r with TKC rear and TKC's f & r and have had no issues. The Scorpions like rear preload. The TKC's wobble the chassis very slightly at full on knee dragging road race antics. I imagine there will be a slight reduction in rear preload necessary to make the 908 rear work just fine. The MT21 & 908 have a 708mm diameter, the Scorpion is 704mm, the Karoo & TKC's are 695mm. The 606 front is slightly smaller than the MT21 perhaps 704mm?