Help flatten the curve by avoiding public transport and switching to bikes instead! WienMobil Rad (formerly Citybike Wien) is a bike-sharing service provided by nextbike, where you can borrow bikes for one hour free of charge. It's the cheapest and most eco-friendly choice to travel around Vienna. There are currently more than 100 nextbike bike stations throughout Vienna, which are available around the clock (24/7). You can rent or return a bike at any time at one of the many nextbike stations.