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Volsung

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Reply with quote  #1 
I'm in the planning stages of a new wheelset with nothing set in stone, so I was looking at Stan's website.  Does anyone have any experience with this RiACT hype?  They claim it adds compliance, but I don't see how it could be any different than any other carbon without damaging spokes.
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stud.beefpile

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Reply with quote  #2 
I have a set of 29er Valors, which I believe have the RiACT.  I have a set of Arch EX ZTRs, and the 29er Valors (with the exact same Schwalbe Thunder Burts) are smoother-feeling to my undercarriage.  I run them on a Salsa Fargo mostly on gravel in northeast Kansas.

I've run them on the Dirty Kanza 100 & 200 (once each) and Rebecca's Private Idaho (RPI), in addition to probably 700ish training miles this spring and they're still straight and round. 

For RPI, there's something like a 7ish mile descent of 2500ish feet that I probably hit 30 mph on over some pretty rough gravel and roads. . .I ran them around 30 front, 35 rear, and no issues whatsoever.

I'd buy them again.
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Volsung

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Reply with quote  #3 
Thanks!  Have you tried that tire/bike combo with other carbon rims?
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bnystrom

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RiACT sounds like complete BS to me. I've built a lot of wheels and if a rim is flexible enough to allow it to actually absorb impacts, the wheel is not going to last. The reason is that if the rim flexes significantly, the spokes will go slack in the load-affected-zone and the cycles of tension and slack will cause fatigue and spoke failure. That's why wheels are built with as much spoke tension as the rim can handle in order to minimize rim deflection.

Additionally, when you've got a tire that can deflect substantially on impact (30mm or more for typical gravel tires), there is no way you're going to feel the tiny amount of flex (<1mm) that you get in a rim. Any perceived difference in feel between wheels is due to air pressure, volume and/or tires differences, or the "placebo effect", not to rim flex. I like Stan's products and use them, but shame on them for using this "snake oil" approach. You shouldn't need to lie to sell a quality product.
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stud.beefpile

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Reply with quote  #5 
Quote:
Originally Posted by Volsung
Thanks!  Have you tried that tire/bike combo with other carbon rims?


I have not.  I've been happy enough with the Valors for (my version of) "racing" (which is riding to finish) and training that I probably wouldn't buy another carbon set of wheels specifically for this bike.

I've been looking at possibly having a set of Nextie or CarbonFan wheels built up for my commuter/training bike, which is a Breezer Radar, but haven't pulled the trigger yet.
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