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I had my dynamo wheel built by justridingalong.
Great service and fair cost.
And in maybe 25,000 miles. Not a single issue to re tension needed.
With regards to lights and dynamo. Think about the amount of time your riding in the dark? If it's not long, a battery powered light might do... Also will you be charging from the dynamo or from stops? Or batteries for etrex.
Losing 5W to a dynamo is a fair amount when only doing 140w.
£9.99 wheel build >>>>>>>>>>>>>>>>>>>>>>>>>>>>