4Wieler is a small but dedicated 4 wheel bike development and construction company. Located in Leiden the Netherlands they build, market and sell the Solo, Duo and Cargo (= Bykkar) 4 wheel bikes. In the past Solo and Duo models were mainly sold to health care institutions and end users, mostly elderly and disabled people. Although this segment of the market is important and our customers are very happy using our bikes, the bikes can also be used for many other purposes. The bikes have a very good looking design and can be used e.g. for recreation and holiday for both the young and the old. Or for the transportation of cargo in old city centers with historic value. We are now planning new models especially for these markets. In Leiden we will start a bike sharing project with the Duo models and we rent them as well to tourists and visitors. In the near future we have plans to expand our business to neighbouring countries and for that we are looking for partners.