A few of question regarding the Schlumpf speed drive:

Will I be able to shift if I am using toeclips and straps?
And can you use any kind of chainring with it, or does it use some kind of proprietary chain ring.
I can only find them with a maximum chainring of 40t, which may be a bit small for the Tikit.

How does it feel? Any kind of extra drag with the speed drive engaged?