Following the Strida project, Sinclair Research
commissioned MAS Design to develop a new folding bike. This was to have small
wheels – essential elements when trying to save weight and space on a folding
bike. A new concept was developed, prototypes were tested and tooling details
were produced. Key aspects of the patented design include:
> The frame – two main frame elements fold in a scissor action by a
skew joint. This allows the wheels to fold side by side.
> Steering – this was by auto-tensioned cables via variable ratio pulleys.
These provide a good steering feel to hub-centre steering.
> Drive – this was by internal belt or miniature chain.
> Construction – this uses injection-moulded long fibre carbon and glass
shells ultra-sonically welded together. Fusible core, foam and gas injection
technologies were also used.
> Tyres – solid tyres were developed as an option with PU versions
performing better than pneumatic equivalents.
This project was undertaken in collaboration with David Southward (CCL
founder) Shaun Househam & Alex Kalogroulis. Planned for low cost
production, the same concept may now work with today's carbon frame
techniques, but not for such a low target price. Sir Clive went on to develop
the A-Bike with
and video are HERE