Autospell drives me mad.
As noted above, I've just built a new pair of wheels for my GF Ti. The previous wheels were called away to do duty elsewhere and, at the same time, I find myself in possession of a spare.set of dynamo lights, so I decided to build up asset of lighting dynamo wheels and see what could be done. I wanted to keep there's as light as reasonably possible, consistent with being reliable and not floppy.
The dynamo I selected is the Shutter Precision SV-9, which is a tiny 2.4 watt dynamo that is claimed to provide the full 3 watts at a slightly higher speed than allowed for in the German standard. Weight isbaround 310g and it is available in various drilling and for different lacking patterns. The downside to the sv-9 is the narrow flange spacing at 50mm outside to outside. After various thought experiments I decided to build 324 spoke radial, heads in to maximise stiffness with laser spokes and a stiff rim to help out.
The rear hub is a hope Mono RS, which with an offset rear rim gave nds tension at 62% of ds and is 11 speed capable. Spokes are 28 2x, laser nds and race ds.
Alloy nipples throughout, blue apart from silver either side of valve hole.
Having got this far I wanted a wide, tubeless ready rim that was as light as possible and available with an offset drilling for the rear. The Kinlin 22T isn't available with the offset drilling, so the remaining choices were Kinlin 31t, DT Swiss r440 or Ryde pulse sprint.
The sprints are super light, but have very thin brake tracks and are expensive for a probably short lived rim. The DT Swiss are a bit narrow and shallow for ultimate stiffness, leaving the 31T.
The wheels built up straight and round with fairly even spoke tension - only my 6th and 7th wheels, but they seem to be the best yet. I took a lot of care destressing and ensuring even tension using ear and ukulele tuner as well as tensioner. Final tensions are 1100N front and 1300N ds rear. Nds is around 800N or slightly over as expected.
Weight has come out at 900g for each wheel before tape, valve and qr. I've got a set of the superstar 22g qr's so they don't add much. This 1800g wheelset compares to 2200g for the previous dyno wheels I built with sp's pv-8 front, 5700 rear, aci alpine and strong (ds rear) spokes 32 3x with 22t rims.
I've not ridden them yet as I'm waiting for some more rim tape, but hopefully will try them out this weekend.
Mike
