Balancing Wheels....

Much has been written about balancing; the pros and cons. I balance but always before using a sealer such as 'Slime'. It's a good product and I rely on it for thorn protection but it will have a huge impact on trying to balance a bicycle wheel because it moves around inside the tire/tube. I use solder wrapped around the spokes. It seems to work well. Your bearings must be good and well lubricated and as you've discovered, the front is always easier than the rear. Remove both chains, the engine drive and pedal chain and allow the rear weel to rotate freely before attempting to balance it.

Tom