I recently added gears to my SS and experimented with a 1x7 setup on a Hope pro 2 SS hub (usally you run 1-6 cogs on them). I modified a DA cassette to get the 7:th cog fitted with a little overhang towards the spokes, gear ration is 38/12-14-16-17-19-21-23. To get the X.0 gears to run the 12T cog I needed to add a 0.4 mm washer when mounting the rear derailleur. I also needed get a longer and unpointy (H) adjuster bolt to stop the derailleur on the the 7:th cog.
Unmodified inner spindel with cogs 19-21-23
After some work with a file
Fitted on the bike, cassette weight with lock ring is 131g and there is still about 2 mm between the cassettte and the spokes.
I also made a prototype chain guide at 39g. After a few runns I think the design might work but it needs to be built in something more solid then transparent plastic
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