Like it or not they do work. We used to put about 4-6 golf balls in the 38" tires, ballanced them right out. Still didn't ride like a caddy, but worlds beyond what it rode like before. Do they work? Yes. However it's not what I would use in my 170+ mph runs, in my jeep that hardly ever sees 70mph, yes. Also don't buy those, go to Walmart and buy yourself a box of copperhead BBs, lots cheaper and the same damn thing. Throw a handfull in each tire and inflate. Works good untill about 35" then something more substancial like golfballs are needed. Still wouldn't do it on a motorcycle.