I have an info from the Gomog site. Quaife copied the older rack-and-pinion steering. Quaife steering is very good. But the end stop is further than before. That's why wider tyres touch the wheel arches at the 4/4, so I think the real width of the TTrac2 is a very good compromise. At 185/70/15 you have to make slight changes in most cases (not in every case, because every car is a bit different).