Originally Posted by HillRider

Well the 700c (622) rim will have a 31.5 mm greater radius than the 26" (559) rim so the bike will "stand" that much higher in front, all else being equal. That will noticeably decrease the head tube angle and increase the trail. However, depending on what tires were used on the 26" and what you use on the 700c, that difference may be less, more or the same. The 5 mm difference in a-c dimension is about negligible but the tire size and rim dimensions are not.