Originally Posted by
Jipe
The small wheels is part of the Sir Alex Moulton bike concept together with the very stiff frame and full road suspension.
The only drawback is the reduced choice of high end road tires in ETRTO406 (and almost single choice = Schwalbe Kojak in ETRTO369).
Full suspension is itself a drawback. It introduces weight and complexity. The primary suspension on bicycles is their tires. I think Moulton accepted that narrow higher inflation tires had higher efficiency. It was true in his day, due to the state of tire technology of the time. So he needed shocks to compensate for the wheels and tires.
That said, I like Moulton bikes. I like the truss design and quality components. There are roads I can ride faster having full suspension. However, most of the time, on a 20-inch diameter, 2-inch wide supple tire I don't need suspension and the bobbing front suspension makes for losses of energy.