Wont´t be able to measure myself since I want to order spokes and rims from the same place to save money on shipping. There is a SLF85W front hub which has about the same center to flange width as SLF71w but larger bearings. Are larger bearings better for durability?
An, didn't realize/remember the slf71 was wide. I think the width will be most significant. Yes, larger bearings should be more durable but I personally have not had any issues with front hub bearings, so I would not worry too much about that.
Not measuring just means you risk getting the wrong size spokes. The worst is realizing that after you have spent 3 hours on the wheel and the spokes have bottomed out before they are up to tension, so at least do yourself a favor and measure them before your build so you can return the spokes if they differ significantly from claimed.
The thicker Race spokes should be stronger than Lasers no? Do you mean it would be sufficient with Lasers all round?
The thicker Race spokes are actually weaker (1300 N/mm2 vs 1500 for Laser). They are, however, stiffer spokes. One (other) reason people like to use them over Lasers is that Lasers have more extreme windup. But you can build carefully to remove windup. On my most recent build I used little tape "flags" on the spokes so I could see the windup (and unwind them). That seemed to work really well. On my own wheels I have just felt for windup and fixed any issues after a few rides, but these were for someone else so I wanted to be as sure as possible that the spokes were not going to unwind. Anyway, I assume weight is a driving factor here which is why I suggest Lasers (and lower spoke count).
Hopefully someone that has these rims built can weigh in, as I don't want to lead you to under-building! My last rim-brake alloy wheels were 20/28 Kinlin XR300; deeper rim, but also narrower and rear was plenty stiff for sure (I weighed 180lbs when I was using those).
Have read on the Stans forum that the new Alpha 340 won´t need nipple washers because of the thicker spoke bed, but should maybe consider that anyway to be safe.http://messageboard.notubes.com/viewtop ... f=2&t=3390
I would do it anyway, because it strengthens and simplifies build with virtually no weight (or significant $$) cost. I build all my wheels now with the round polyax washers. It may be placebo, but I have had issues with burrs or rough spoke beds breaking alloy nipples in the past.