I am facing same issue, It vibrates at around 60 and then again at between 110 and 118. Everything is default including tyres and rims. At 120 it is smooth again. I have VXL 16 model, I am also planing to install new tyres.
If someone can advise, how this issue can be resolved as I have to travel on motorway. Which tyres size/type will be best to avoid this issue and to maintain better fuel economy.
Any help will be appreciated. Thanks