upgrade the NoFrill bike to a lighter wheel set with hub dynamo

- hub dynamo: black Shutter Precision PV-8 instead of Shimano (higher efficiency = lower resistance, lower weight, better bearing)
- front wheel: 24 butted stainless spokes, black
- rear wheel: 28 butted stainless spokes, black
- black double walled alloy rim with machined side wall and wear indicator

will reduce the bikes weight by about 600 g

Possible only in connection with a NoFrill bike order.