Well, it's clear to me that the drag-vs-light remains a consideration in choosing between an SP SV-8 and SP PV-8. Even with my SP PV-8 hub (and my SON28, for that matter), there have been a few occasions when I wished my light were brighter at a relatively slow speed when it was in fact brighter at a higher speed. That is, I know there are times I'd prefer it reached higher output sooner. I believe I'm in a minority but I know I'm not alone. Even if one ignores device-charging (in which I'm uninterested), the use of a halogen headlight is not the *only* case where the higher output would be nicer. Right now the absolute drag I have *is never a problem* for me and the slow-speed light output *is*, even if only a small, rare problem.
I use a dyno tail light. Some people don't. Maybe that affects my experience. I may someday try an SV-8 wheel to see if the reduction in drag is worth, to me, the reduction in light output. For me neither reduction makes the decision on its own; both reductions are factors to consider. Yours, Thomas Lynn Skean On Wednesday, June 10, 2015 at 12:38:18 PM UTC-5, Jim Bronson wrote: > The hubs that are for smaller wheels will generate full light with modern > LED lights at very slow speeds, something less than 5mph, in my > experience. In fact, only when I spin my hub by hand, or walk the bike, do > I notice less than full output with my 80 lux light. > > People overestimate the speed required, and thusly suffer hubs with higher > rolling resistance. It's an outdated argument that frankly needs to stop > being made, unless the person in question is using old school halogen > lights. That's the only case under which you really need the higher output. > > Clearly Rivendell agrees with me, as they sell only the SV-8 version and > not the PV-8. > > I can understand, if you already have the SON28, or one of the Shimano > hubs, or the PV-8 that the lower rolling resistance is not worth $100-$300 > to fix by buying a new hub. If you are buying one new today though, > there's no reason to consider the models with higher resistance. > > hth/k/bi..... > > On Tue, Jun 9, 2015 at 2:38 PM, Thomas Lynn Skean <thomasl...@comcast.net > <javascript:>> wrote: > >> I have an SP PV-8 hub on one Hillborne and a current-generation SON28 on >> another Hillborne. I like them both just fine. I may end up getting another >> dynamo'd wheel in the future and, barring near-future failure of the one I >> have, will probably get another SP PV-8 just because it's >$150 cheaper. >> >> If I were a generally faster rider I might've gotten an SP SV-8 (which I >> think is the one intended to work with smaller wheels with higher typical >> rotation rates. But I don't like the notion of worrying about going "fast >> enough to see" when I have a choice. >> >> I use them both with an Edelux II and find I have plenty of light when I >> need it, even below 10mph. Off-the-cuff I can't tell whether one hub yields >> more light than the other at the same speed. Nor can I tell that one is >> more easy-rolling than the other. Sometimes I do feel that the SON28 is >> rolls *smoother* but not necessarily *easier*. On both I can feel the >> resistance when the light is on versus when the light is off. And for both >> I *think* I can tell that they do not roll as easily as a non-dynamo hub >> even when the light is off. But assuming that's true it's not nearly enough >> to make me want to go back to a non-dynamo hub. I would consider going >> back only if either becomes unreliable as a light source in the next few >> thousand miles. >> >> I got the SON28 simply because I suspected (and still suspect) that it >> will last longer. With only hundreds of miles on each (all problem free) I >> can't speak with experience on life expectancy. I'd've been very >> disappointed if either had had issues before now. I prefer the SON28's >> connection style but the SP's works fine also. >> >> Yours, >> Thomas Lynn Skean >> >> On Saturday, June 6, 2015 at 12:53:44 AM UTC-5, Don Funke wrote: >> >>> Anyone have experience with these hubs? They have some good reviews and >>> are considerably less expensive than some of the german brands. I assume >>> they can be manufactured cheaper without the stringent german regulatory >>> process. >>> >>> http://www.intelligentdesigncycles.com/shop/shutter-precision-hub-dyanmos.html >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "RBW Owners Bunch" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to rbw-owners-bun...@googlegroups.com <javascript:>. >> To post to this group, send email to rbw-owne...@googlegroups.com >> <javascript:>. >> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Keep the metal side up and the rubber side down! > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
