SP 8 Series Dynamo Front Hub - PV-8 6V- 3W QR x 100mm Rim 32H BlackSP 8 Series Dynamo Front Hub PV 8 6V 3W QR x 100mm Rim 32H Black. Attention to details creates perfection. The 8 Series dynamo hubs are not only the smallest size but are also the lightest at 350g. Compatible with standard dynamo system lights and convertors for USB powered devices. High quality sealed bearings and assembly processes TECH SPECS Bearing Type Sealed Cartridge Center to Flange Left 23. 4 Center to Flange Right 23. 4 Color Black Defined