I am not sure, and confused, but I am suspecting there might be a bug regarding tire radius, especially if front and rear tires have very different diameters. An example: Player real time - .tgm AI controlled real time - .tbc I checked physics parameters of this car, and .tbc radius values are pretty much exact to furthest .tgm geometry node in y axis. Front tires shrink less, and rear tires shrink more when turning from tbc to tgm. I am working on one project, where cars has similar sizes front vs rear, and there is same effect, but base tgm is from different car origin, not Gasiline Alley. As a side effect this also affects rideheights. At least graphically it certainly does, not sure if it does affect it physically too, just as well not sure if tire gets affected physically too or if in physics it is all correct.