For a commuting bike.
I was thinking about getting a dynamo hub for my Speed P8 with 20" wheels
with the idea of having backup power for my CygoLite Dual Cross head light.
The battery supplied is 4.8V.
Is a dynamo voltage specific?
Does the higher rpm with a 20" wheel a problem?
I really am not sure of all of the considerations of having a dynamo for a
specific light, so any info would help.