I’ve seen a lot of guys, age-groupers, elites and pro cyclists alike and positioning on the saddle of the bike seems to vary a great deal. I understand that personal comfort will vary, but there seems to be a lot of that! Some people sit painfully on the nose, as far forward as possible, others sit back on the actual seat. I am talking about tri bikes specifically here, so riders would not be constrained by rules (UCI etc) - but some (really quick guys) seem to be riding in really tricky positions.
Why so?
The only advantage I can think of is to have extra space to slide back onto for climbs, as that might help some folk when climbing on tri bikes in very forward positions.
Eg: Hushovd in a pretty “normal” pos:
http://www.cyclingnews.com/photos/2007/jun07/dauphinelibere07/index.php?id=/photos/2007/jun07/dauphinelibere07/dauphinelibere073/fs00
http://www.cyclingnews.com/photos/2007/jun07/dauphinelibere07/index.php?id=/photos/2007/jun07/dauphinelibere07/dauphinelibere073/fs005
Dave Z - looks uncomfortable!
etc