Hi I have an iS200SE, i have gone through 18 front tyres in 3 years and 40k, with 3 major geometry checks and loads of tracking. I believe I have sorted it out thanks to WIM and my local garage man. The main rubbers on the swinging arm bushes and the front trailing bushes are not strong enough. At rest and having the geometry checked with the wheel on the road they appear to be fine. When driving however the bushes are not strong enough to hold the front wheels in the correct alignment and so they deflect out slightly as the road undulates and cause excessive inner tyre wear, and the car to waver all over the place, which can be a bit scary if you like to drive a bit fast.
Change the bushes to heavy duty rally performance bushes, I think I got them from PIR in the West midlands, then set the geometry as WIM settings and feel the difference immediately. Handles like a dream, sharp taught and responsive, good straight line stuff even when braking hard. The new bushes are reinforced with an inner steel ring and use a much harder rubber.
I have only recently had this done so I will keep a close eye on the tyres, but no inner tyre wear yet.
P.S also up the tyre pressures by a few pounds.
Lexus know all about it, they just deny it.It is common on the is200, probably the same on the 300.
Bobby the Fish
No sorry mate, only those on my site. The SC normally is quite resistant to the tyre wear problem so there must be a real issue with yours. If needs be i can write a 'safe set-up' for you to take where ever?