 However, most drivers never disabled the freewheel, because it made shifting gears significantly easier and smoother, though not quicker.Today the 353s are customized for reaching speeds well about 200 km/h (125 mph), whereas the original design called for critical speed of 150–155 km/h and 12 seconds to accelerate to 100 km/h (62 mph), which was dealt with in second gear due to the high-rev engine.It was available both with four- and five-speed transmissions, although the latter was very rare.