The present invention relates to the field of sliding door systems. The invention relates to a wheel carriage8300) for a sliding door resting in sliding track (106), comprising wheel connection means (340) adapted to removably connect a wheel shaft (331) at two connection points (341) positioned on each side of a wheel (330). The invention also relates to a method for exchanging the wheels (330) of a wheel carriage (300), by lowering a door panel and replacing the wheels (330), while the wheel carriage (300) is resting in the sliding track (106).