I honestly don’t know if this has ever been covered before, but considering everyone I know and have met whom are on pneumatics and the fact that they aren’t using this method, I will assume not a lot of people know about it.
Well the issue is the fact that these 7-8" pneumatic wheels do in fact vibrate a lot and there’s really no easy and effective way to conventionally balance them - unless you get some wheel beads!
I first was introduced to wheel beads a few years ago while attending a track day with one of my bikes. There was a vender there promoting the stuff, and I was intrigued if they actually worked or not. So I bought a kit ($25) and put them on the wheels of my AWD Christini, and wow was I amazed! I noticed a difference almost immediately! Such a simple, cheap and easy to use product that actually works!
How it works - Basically you add these little ceramic beads into the wheel by temporarily removing the bleeder valve / core. How much you put in is calculated by the wheel size, application and use. You close everything back up, add air and you’re good to go! Basically, the beads spin within the wheel and will counter any imbalances you have.
I just added a few grams to each of my 7" Trampa pneumatics and the difference is night and day! The ride at higher speeds is smooth and steady. No more vibes!
If you’re on pneumatic wheels, I highly recommend you get some and give them a try! They’re available on Amazon, eBay or on any of the many motorcycle parts and accessorie stores online. Prices usually start at around $15 and go up depending on how much you need.