As far as speed is concerned, i drove it from at 120 to 140km/h (also took it to 150km/h once) on motorway from Lahore to Faisalabad, and had no wobbling issue at all. Mashallah car was running fine and had no issues. I m using 165 70 R13 tyres, but even on stock tyres, when i drove it on motorway at 120km/h, didn't have any wobbling issue.