I find that kind of rubber band suspension very interesting and I've heard that it gives a very good ride, only I wouldn't know where to begin with trying to find a suitable suspension band down here in New Zealand.Allow me to show you a HVA (Husqvarna
Google translate is your best friendSlovakian DIY instructions for a friction driver
http://urobsisam.topky.sk/navody/zostrojte-si-pomocny-pohon-na-bicykel