Suitable for all different sized wheels

From wheel size 400 mm(16”) to 535 mm(20”):

The 9 series’ output perfectly matches German StVZO 6V3W/20” regulation. As can be seen from the table, from wheel size 400 mm(16”) to 535 mm(20”), the 9 series output is designed to meet StVZO regulation.

From wheel size 646 mm(26”) to 716 mm(28”):

According to German StVZO, it requires 3V output at a low speed of 5km/h. If the 9 series is set on wheel sizes of 646 mm(26”) and 716 mm(28”), it offers 3V output speed at 5.8 km/h and 6.4 km/h respectively. To have 3V output, it only needs to slightly increase 1.4 km/h speed.

Furthermore, according to German StVZO 6V3W regulation, it requires 5.7V output at 15 km/h. If we set the 9 series on wheel sizes of 646 mm(26”) and 716 mm(28”), the 9 series offers 5.7V output when speed at 15.7 km/h and 17.7 km/h respectively. To have 5.7V output, it only needs to increase 2.7 km/h speed. As for 6V3W, the German StVZO approved hubs in the current market normally offer 6V3W output at around 17 km/h.

Meanwhile, 9 series offers 6V3W output for 646 mm(26”) and 716 mm(28”) wheels when speed at 16.7km/h and 18.6 km/h respectively.