diablo: the bb drop on any 700c frame will result in a noticeable angle of chainstay relative to the ground. the stay will slope from the axle downwards to the ground.
the axle of a 650 wheeled bike is already lower to the ground, and so to place the bb at ( approximately) the same height relative to the ground ( desireable) there will be less observable slope to the chainstay seen. go look at some. or, consider a bike with say, a 20 inch wheel: in order to place the bb at a suitable height from the ground the chainstay would actually have to slope UP to it. that is the phenomena which is observable in these photo's. and, incidently, explains why your claim that bb drop as being independant of wheel size is ( by definition), in truth, "nonsensical". the bb drop is actually a FUNCTION of wheel size, hence the word "drop" - or, in the case of a 16 inch wheeled moulton, "reverse-drop".
irondad:many a lie has been spoken regarding "stock" frames. a 650 wheel on a stock specialized frame will not allow any modern dual pivot brake to reach the rim.
the axle of a 650 wheeled bike is already lower to the ground, and so to place the bb at ( approximately) the same height relative to the ground ( desireable) there will be less observable slope to the chainstay seen. go look at some. or, consider a bike with say, a 20 inch wheel: in order to place the bb at a suitable height from the ground the chainstay would actually have to slope UP to it. that is the phenomena which is observable in these photo's. and, incidently, explains why your claim that bb drop as being independant of wheel size is ( by definition), in truth, "nonsensical". the bb drop is actually a FUNCTION of wheel size, hence the word "drop" - or, in the case of a 16 inch wheeled moulton, "reverse-drop".
irondad:many a lie has been spoken regarding "stock" frames. a 650 wheel on a stock specialized frame will not allow any modern dual pivot brake to reach the rim.