Re: Bubling on slow speed. How many km you clocked. Some times new tyres acts like this. And it could be due to any wheel balancing issue also. If your car/tyres are new,then rebalance the wheels & wait for min.100 KM use. Recently I changed tyres of my GP. I installed Goodyear Duraplus. That time I also noticed bubling effect. But bubling disappeared after using car for some 20-30 KM. I saw a brand new car (Unbilled) which was tremendiously pulling.So new car also may need balancing & alignment.