Originally Posted by Ceya
Good morning gentlemen. I think you guys are talking about a couple different types of shells. By "batwings," Ceya does not mean merely a cast reinforcemnt between chainstays, but rather integral gussets between the other tubes joined at the bb. The spearpoint shell on the bob jackson is a long shen model shown on the ceeway site (first bb shell page, top row, fourth from the left):
http://www.ceeway.com/Bottom%20Bracket%20Shells.htm
The shell on the Alma Pura bike is a Silva model 528 shell and is also on the ceeway site (second bb shell page, half way down the page on the left side):
http://www.ceeway.com/Bottom%20Bracket%202.htm
I don't know how effective these shells are at stiffening the bb; because I don't think the average cast bb shell is very flexible. But both of these are good looking!