The vibration feels like an out of balance tire but the problem is only noticed at low speeds between 30 and 50 kph. At higher speeds the vibration lessens. The only cure for this problem is to replace the tire. Tire radial force variation is the most difficult tire vibration to diagnose. Good tires have equal stiffness in the tire sidewall all the way around the tire.
Some tires have a variation in stiffness that can cause a vibration.
This can be a time consuming and expensive procedure. Replacing the tire is the only way of repairing this type of vibration. Bent wheels or axles are another source of vibrations. The balance weight may simply have been knocked off by the curb and the tire needs re-balancing, but a bent wheel or axle can be checked by a technician using a gauge to measure the amount of wobble or runnout. Steel wheels can be straightened.