Supplier of round objects to the forum
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Maybe 6 pairs instead
If not, why not?
You'd have to ask them. Possibly the jump from 7900 to 9000 was to avoid confusion with the XT 8000 MTB group.
I would not call ot a zigzag but i suppose a small wave
I am also not sure what the advantage is of the type of lacing
You have your answer right there. Paired spokes eliminate the axial wave which alternating spokes inevitably generate. Of course, they introduce a bigger radial wave than you had with evenly spaced spokes, but deep rims are much stiffer radially than axially, so it will be less of a problem.
I wouldn't even attempt it unless the rim and hub had properly matched drilling patterns, as you say trying to do paired spokes when one or both components isn't designed for it is a recipe for irritation.
Bare in mind
I like it it, so it must be wrong.
"I cannot longer ride due to back problems "
Anything other than the 808FC in the running (around £500)?
Team Arrowcock seem to have found a Chinese crabon rim which tests well
Always disc and deep
Always disc, deep depends on whether you can handle it in the prevailing wind, although that's moot in skinny's case if the choice is between 909 (i.e. 404+disc) or 404.
How could we now ? the age of the Nitto Jag ?
Take it out and look for a date mark stamped on the quill, decode the 2 letters using this table.