awesome. thanks a lot for this. how many grams would you suggest per wheel (200mm)
I dunno, maybe it’s only on trampa treads. But it’s easy to find when it’s deflated.
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@okp I bought a 3oz/85g bag, I’ve divided it in to 6 x 14g lots so I had enough for a couple of spare loads if needed. How much does the valve really weigh? and it does not have as much force per weight on the wheel as it is mounted on a smaller radius. 10g could be plenty, a few grams might work? you would have to test to be sure though. If you roughly balance the tire like @vap is suggesting you would need even less… 
I have used a bit extra so I can get mud on my tires and the wheels will self balance while I’m riding 
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@okp So have you tried these balancing beads? My rear wheels feel wobbly at about 30km/h, probably because of my large 3D printed pulleys.
@Cobber Thanks for sharing mate!
not yet - 10chars
All right I’ll order some and let you know if it changes anything.