Thank you, lyons, such an old catalog is interesting even for someone like me who is not at all interested in sports. I strongly advise against using the bicycle shown on page 40 (45). :-)
Yes, those giant front-wheeled bicycles and tricycles are very difficult to maneuver. My business partner and landlord in Munich's wife has trouble with her balance, and so cannot ride a normal, common bicycle. So he bought her a tricycle very like the model shown on Page 42, except it also had a wagon attached, behind its two-barred frame. I volunteered to drive it home for her from the shop. It was incredibly hard to direct, as when it was even only slightly off a straight forward course, it would pull hard in that sideways direction. That 0.8 km drive took me almost 2 hours!!! I kept starting to go in circles. Imagine how difficult it would be with the cart filled with watermelons!
I can imagine that the bicycle on Page 40 and 41 would be very difficult to balance upward, because the driver would need to keep it very straight, and moving fast all the time. When you slow down it would tend to lean to one side or the other, and it would start to fall over. The driver's weight then leaning towards that side would provide more weight to pull it flat to the ground. It would take a lot of leg strength to keep it straight enough to right oneself, to avoid tipping over. It's almost as high up as riding on a short horse, but without the four legs for stability. I'm not surprised that that model no longer exists other than as a collector's item for history buffs and nostalgists.
But, I must say that the pen-and-ink work in this book is excellent, as usual for that period.