There are many opinions about if balancing the wheels of an small aircraft is required. I decided that it can’t hurt as long as it is guaranteed that they don’t come loose.
I used a good quality brand of self adhesive balance weights and did some test. When the surface is scuffed and cleaned with aceton they remain in place.
From Amazon I purchased a wheel balancer for motorcycle wheels.
In total 2 weights of 5 gram were needed on both sides; so 20 gram in total.