The Riv has a SON 20 R, which is Schmidt's lighter, lower-resistance model:
it was originally designed for smaller wheels ("20" versus the model "28"
for 26" and 27" wheels) that, of course, rotate faster, and thus it was
designed to put out a given wattage at a relatively higher wheel rpm. This
means (1) that at a given wheel rpm there is less drag than for a dynohub
designed for a larger wheel and (2) that you have to get to a very slightly
higher speed to reach full light power.Having said all of that, I will add that all of it makes very little difference in drag and the principle advantage of the "20" is that it's lighter and prettier. Is that worth the $100+ premium? To me, for one of my "pretty" bikes, yes, but practically, not a bit. Whether the SON will last longer ... I'll know in a decade or so. As to light output, the new LED headlights are so efficient that there is hardly any noticeable difference in the minimum speeds for full light power: perhaps 5 mph instead of 4 mph (with LEDs; halogens would cause a bigger difference). For value, I have chosen the newer Shimano dynohubs: I have one on my grocery bike and am just now having one installed on my Fargo. The grocery Motobecane has an IQ Fly without a switch, so it is always on -- and there is thus added drag; but even with the light on I notice no difference at all in riding. The SON, with the light off, revolves almost as freely as a standard hub -- and note, this is with a very light, smaller diameter 559 wheel with a 200 g tire. It would revolve even longer with a larger and heavier rim and tire combo. As to lights: The VO Spanninga LED light is cheap at $38 and is usable, but not nearly as good as the Fly at about $60 (Peter Jon White), and the Edeluxe is even better, but at over 3X the price. I've got a Cyo for the Fargo ($100) that others say is as good as the E in performance if not in sturdiness and prettiness. On Fri, Oct 1, 2010 at 5:59 AM, Thomas Lynn Skean < thomaslynnsk...@comcast.net> wrote: > Hi! > > I would imagine a single-speed rider might be more sensitive to this > issue than many other folks... > > What kind of dynamo hub do you use? I couldn't tell in the pictures. > And what kind would you buy today if you were looking for a new one? > > If "dynamo drag" is something *anyone* would "suffer" from (even/ > especially if only psychologically), I imagine it would be a rider > whose drivetrain might otherwise be 99.99999+% efficient to begin > with. :) > > I would also ask if you like your Edelux light, but I won't because > (1) I feel better addressing only one off-topic issue without changing > the thread's subject and (2) since I seem to see one in every photo of > a nice-bike-with-dynamo-lighting I've seen recently, I'll instead > assume you love it and would recommend it. :) > > Yours, > Thomas Lynn Skean > > On Sep 29, 10:00 pm, PATRICK MOORE <bertin...@gmail.com> wrote: > > I've finally found the ideal bar bags for my two Riv customs. See below. > On > > the blue '99 gofast, a prototype tube bag from Cambria; don't know if > they > > are carrying it. It works as a saddle bag, but swings; it's better as a > bar > > bag. Fits Lezyne minipump, two 650c tubes, various little tools and two > KEO > > cleat covers. > > > > For the '03 commuter, it's an old, early-days Rivendell Acme seatbag, > back > > when Riv made cheap, serviceable bags. Also meant to be a small saddle > bag, > > but works very well as a bar bag for a bike on which I ordinarily carry, > in > > addition to a tool kit like that above, night-time reflective bits, spare > > batteries, 16 oz of keys, etc. > > > > http://picasaweb.google.com/BERTIN753/BIKESMISCELLANEA# > > > > -- > > Patrick Moore > > Albuquerque, NM > > For professional resumes, contact > > Patrick Moore, ACRW at resumespecialt...@gmail.com > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To post to this group, send email to rbw-owners-bu...@googlegroups.com. > To unsubscribe from this group, send email to > rbw-owners-bunch+unsubscr...@googlegroups.com<rbw-owners-bunch%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > > -- Patrick Moore Albuquerque, NM For professional resumes, contact Patrick Moore, ACRW at resumespecialt...@gmail.com -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bu...@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
