As far as I know, bleeding will occur as long as the hem is in contact with the suede. You might have more luck if you cuff them slightly, such that only the interior of the jeans are in contact with the suede. If the jeans are newer and raw, I've found that even cuffing them can't completely get rid of te bleeding. Fortunately, the dye will come off with water/saphir suede "shampoo". After all, the dye is water soluble.