put the Deda seat post with a 25mm offset on my bike, with a Selle Italia SKL saddle. The saddle has stop marks on the rails to show you how far you can move the saddle. I only have 5mm for forward or backward adjustment. It doesn't seem like very much. I think it really restricts you from making much of an adjustment. I was thinking maybe the clamping part of the seat post is larger than others and I can cheat some, but I don't know if I should try it or not. I would hate to break a rail 50 miles from the house. What would you guys do?