"We chose 28-inch tyres so that you can comfortably ride in town: a smooth rolling bike that can easily drive over small obstacles along the way. Not even cobblestones, sewer drains, potholes, or tramway rails can make you lose your balance! Inner tubes are equipped with car valves, you can inflate your tires at a service station. To avoid flat tires, we recommend keeping your tyres at a constant pressure between 3.5 and 4.5 bars (depending on your weight)