[JasonB]

I don't think so, I think they mean 100mm.

I believe this was added because a few of us pointed out the difficulty of making smaller tracks join up if the smallest straight is 20cm long. That was certainly my experience working in UR, and it seemed a shame, because the tight R1 corners mean that unlike Carrera, small layouts are definitely possible with the SaleAuto track.

This one, for instance, is just a smidge over 8' x 4'.