The red sections represent the parts that are removed when converting to a single
Design #1
Uses: Loaded touring, sport, commuting, anything you want to do on a tandem or single
Frame: $800 Upgrade over #3 - The original design of the Rodriguez 8-Ball. The Captain and Stoker have to be similar in height since a level toptube is required. With this design, the stoker's seat tube becomes the seat tube when bicycle is converted to a single.
Advantages:
Can add a third of even a forth section down the road
Designed to fit either rider as a single
Looks somewhat normal as a tandem or a single
Dis-advantages:
More work than other designs to convert to single
Captain and Stoker have to be similar in heights
Design #2
Uses: Loaded touring, sport, commuting, anything you want to do on a tandem or single
Frame: $800 Upgrade over #3 - This is the next evolution of the Rodriguez 8-ball. This design allows a sloping top tube for more difference in height between the riders. The rear section connects to the keel tube and the stiffener tube when converted to a single bike.
Advantages:
Looks almost like a standard tandem
Built custom to fit any variations of rider height just like a standard tandem
Very easy to convert from tandem to single
Dis-advantages:
Cannot add 3rd or 4th section later on
As a single, it's heavier than the other 2 designs
Design #3
Uses: Sport, light touring, family fun, commuting
Frame: Default design - The default Rodriguez 8-ball design only used 6 couplings. This is a way to lower the top tube height on the stoker even more, to allow riders with less flexibility to easily mount the tandem. It uses a similar connection point for the couplers as the previous design, and has the look of a modern sport tandem like the Toucan.
Advantages:
Less expensive
Built custom to fit any variations of rider height just like a standard tandem