On Wed, 5 Aug 2009 00:10:54 +0100
"Adam Lea" wrote:

I am toying with the idea of getting a hub dynamo for the coming
winter, however the wheels on my road bike only have 20 spokes which
is less than more conventional wheels which I understand have 32 or
36 spokes. Are there any hub dynamos that would be compatible with my
wheels?

Don't bother trying to rebuild your existing wheel - just buy a
complete conventional wheel with a dynamo hub, or buy the bits and build
it yourself. That gives you the choice of good illumination at the
cost of weight and drag, or lower weight and lower drag, quickly and
easily interchangeable.