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I thoroughly suggest talking to @t_w He made me a SonDelux with a HED Belgium rim and it performed absolutely impeccably. From a purely anecdotal point I could not tell the difference between when it was on and off from an effort point of view (though I wasn't exactly pushing hard)
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The drag is only something like 8W, which is basically undetectable to me.
I like Archetype rims and @scherrit is my builder of choice but thanks for the recommendation.
http://www.transambikerace.com/
PBP was a bit of a tester to see how I went when riding >24hrs and I think I coped quite alright (ignore the odd hissy fits) so now this is firmly on the cards for next year.
Concerns: Bike - TT or road? Sleeping - hotels or ditches? Kit? Logistics - getting bike and me to start and from finish?
At the very least I will need a dynamo setup of some kind now.