Just got a bike with NNs and according to the rotation markings, they are going the correct way. Looking at them tho makes me wonder if turning them around will yield less rolling resistance, maybe at the sake of a bit of traction. Dunno. FWIW they're tubeless.
I'd like to hear from some NN fans to see what they've done. Thanks.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: NNs turning the right way?