IS300h does not stay straight on a straight road

[Kermitpwee]

Is it worse in wet conditions?

I had an issue where the rear tyres once below 3mm that would cause the car to weave slightly left and right in wet conditions on the motorway at higher speeds ie 70mph +

[TMHD]

Mine is pulling to the left, need to keep steering wheel all the time. Just a few seconds and I am slightly getting off the course. 

- It happens on any road, on a motorway, on any line, so it is not about the road curvature.
- I've done tracking 3 times already. All reports are near to the perfect. I was asking mechanics and they checked whole suspension/chassis. No any loose or wobbly parts. All nice, fresh and tight.
- Pressure is 2.5 BAR on each wheel. So... where's the issue? ☹️

Tyres: Vredestein Quatrac PRO 225/45 R17 94 V XL, FSL. They were brand new, and from that time issue started. Before it was fine - it didn't pull to any of the sides, but dealer fitted car with an extremely cheap tyres that I could drift while standing still. 😂 After about 2-3 weeks i replaced them with a "better" once for safety reasons.

[wharfhouse]

42 minutes ago, TMHD said:

Mine is pulling to the left, need to keep steering wheel all the time. Just a few seconds and I am slightly getting off the course. 

- It happens on any road, on a motorway, on any line, so it is not about the road curvature.
- I've done tracking 3 times already. All reports are near to the perfect. I was asking mechanics and they checked whole suspension/chassis. No any loose or wobbly parts. All nice, fresh and tight.
- Pressure is 2.5 BAR on each wheel. So... where's the issue? ☹️

Tyres: Vredestein Quatrac PRO 225/45 R17 94 V XL, FSL. They were brand new, and from that time issue started. Before it was fine - it didn't pull to any of the sides, but dealer fitted car with an extremely cheap tyres that I could drift while standing still. 😂 After about 2-3 weeks i replaced them with a "better" once for safety reasons.

If it only started with the new tyres I would check wheel nuts are all tight - in fact may be worth lifting and loosening and re-torquing in case one of the wheels hasn't seated properly? If not that then swap wheels left to right and see what happens. If ithe pull changes side then something to do with the tyres - it's not unheard of to get a bad tyre or maybe something in the tyre being mounted. 

[TMHD]

I've tighten bolts after getting home from tyres replacement. Since that day I din't touch it 🙂
I can try to swap them and will see what happens.

[route66]

It's probably too late now, but new tyres have coloured lines that run along the circumference. The distance from the line to the edge of the tyre is important; even more important us that the opposing tyre should be a mirror of the one on the other side of the axle. If they are not, then you could get the wheel pull exactly as you described it.

More here: https://www.wheels-inmotion.co.uk/forum/index.php?/topic/165-new-tyres-and-their-markings/