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Regardless of whether you decide to go symmetric or asymmetric, I would go 32h. Since you are using such a lightweight rim and considering the abuse you are giving it, the extra spokes will spread the load out and keep it round and true longer while hardly adding any weight. That will make more of a difference in stability than whether you use a symmetric or asymmetric rim.Thanks for linking November Dave's posts. I read through that thread.
I get the impression that Dave's main gripe is against the Pacenti SL23's. I don't have SL23's, but I recall these rims have lots of issues due to it being too light.
My understand about offset rims is that they do have to be a tad more robust at the spoke bed due to the spoke angle to the DS spokes. This cause asymm rims to be a tad heavier than their symm cousins.
anyway, here are all the carbon mtb rims I'm looking at:
Carbon MTB Rims,Carbon MTB Rims for sale Carbon MTB Rims wholesalers,factories,sellers
specifically, i'm looking at the V-shape asymm 27.5er, with 30.5mm inner width, 380g (All-mountain) weight, in 28h drilling.
27.5er Carbon MTB Asymmetric Hookless Rims products- 27.5er Carbon MTB Asymmetric Hookless Rims factories,manufactures,27.5er Carbon MTB Asymmetric Hookless Rims suppliers
and this version of asymm:
27.5er Carbon MTB Asymmetric Hookless Rims products- 27.5er Carbon MTB Asymmetric Hookless Rims factories,manufactures,27.5er Carbon MTB Asymmetric Hookless Rims suppliers
yes, they sell TWO versions of asymm rims. Which one is more robust? Their weight in "AM" (all mountain) configuration is the same at 380g (though the latter offers a "DH" (downhill) version at 430g).
What say you? What say the builders in here? My own a bit "uneducated" opinion is that the V-shape asymm rim should be the stouter rim due to a higher depth (28mm vs 25mm) and the spoke bed looks more robust (based on their diagrams).
Could the wheelbuilders in here chime in why/what the pros/cons of the two different versions of asymm.
My current info, riding style:
I'm a lightweight (122-124 lbs), and i'm not an abuser of equipment, but I do like to huck small lips (under 2 feet) and the landing can't always be soft on a hardtail. My current rear wheel is a SRAM Rise 60, carbon
symmetric rim, 21mm inner width, 24h spokes, and running 2.25" tires. Wheel is fast, no complaints about weight. But like I said, it will go out of true on me in the course of a year (of riding 2-3 times/wk, almost year round). I've looked at my strava and some of my descents are close to 30mph top speed going down doubletrack and jeep trails, but I hardly will hit 30mph, but when I do.. and hitting a big bump.. could this be the main thing that knock it out of true more than the hucking stuff? I'm thinking if I go with 28h spoke wheel, all this will be resolved, asymm or symm! But if I were going to build a new wheel, and I have the option to go asymm or symm, then I would like to know which option is better. But on thing is for SURE, I will go carbon rims for mtb, will not go back to aluminum rims in mtb.