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OP here, an update. Based on a recommendation from Peter at Grin I had him switch me from the GMAC to a Nine Continent RH 212. I have to say that it is the perfect motor for me, it's basically silent and has plenty of power for the hills I ride. (Grin's motor calculator shows them to be 'fairly...

@tomjasz I've shipped the wheel assembly back to Grin. They should have it before the end of the week. I've made it clear what I expect. My fingers are crossed.

I took the cassette off, same noise. I'll send it back to Grin, again. Thanks for the suggestion.

I recorded another short video just now, I think it more clearly demonstrates the noise. Especially off throttle when the RPM is coming down, the same noise no matter what. I reached out to linklemming, my guess is that he will confirm that his Gmac sounds nothing like this. I'll push back on Grin.

But to be fair, the top video in my original post is after Grin re-trued the wheel. It is much better than the bottom video which was taken before re-truing.

Yep. And this is after I sent the entire assembly (motor, hub, wheel) back to Grin for truing. The original was even further out of true believe it or not. Per Peter F., "Yep i see some runout in the motor case. Above average perhaps, but nothing that would give me concern if i saw it here-...

I've been working with Peter F. at Grin, via email. He says: "Indeed Gmac freehub bearings are known weakness, but this sounds different. A bad freehub bearing begins as a ticking, most often and erratic cadence multiple times per rev, and worsens until the bearing fails entirely and becomes a...

I agree that it does sound like something is rubbing. But, the noise is the same even with the brake caliper removed from the bike. I've also done a careful inspection to verify that there is nothing rubbing against the tire or wheel. The noise appears to be coming from within the hub. For what...

I've installed a GMAC motor/sub/wheel assembly on my Juiced CCX. It's part of the upgrade kit available from hilleater.ca. https://hilleater.ca/grin-tech-gmac-upgrade-kit-for-the-juiced-crosscurrent-s-x/ The motor has a ton of power, it's quite an upgrade from the stock Juiced motor. The one...