SP Hub Dynamo, SL, L-Vers
Weight: 0.35 kg , Price: £ 120.00
The new single Shutter Precision SP-8 offers a superior performance, improved reliability, efficiency and a 271g weight saving over the previous Shimano dynamo. It has comparable efficiency to the previous SON dynamo, 91 g lighter and is less than half the cost. (Available on both Silver and Black componentry bikes).
6V 1.5W Ultra compact dynamo hub for wheel size 400mm to 658mm
From wheel size 400mm(16”) to 535mm(20“):
The 9 series output perfectly matches German StVZO 6V3W/20” regulation. As can be seen from the table, from wheel size 400mm(16”) to 535mm(20”), the 9 series output is designed to meet StVZO regulation.
From wheel size 646mm(26”) to 716mm(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 646mm(26”) and 716mm(28”), it offers 3V output speed at 5.8km/h and 6.4km/h respectively. To have 3V output, it only needs to slightly increase speed up to 1.4km/h. Furthermore, according to German StVZO 6V3W regulation, it requires 5.7V output at 15km/h. If we set the 9 series on wheel sizes of 646mm(26”) and 716mm(28”), this 9 series offers 5.7V output when speed at 15.7km/h and 17.7 km/h respectively. To have 5.7V output, it only needs to increase speed up to 2.7km/h. As for 6V3W, the German StVZO approved hubs in the current market normally offer 6V3W output when speed around 17km/h. The SP 9 series offers 6V3W output for 646mm(26”) and 716mm(28”) wheels when speed at 16.7km/h and 18.6km/h respectively.