And that is exactly what baffles me regarding setting the tweak! If you set the tweak with tyres that are differant sizes (larger on the outside), as soon as the car starts to go around the track, that tweak setting will go out, as the outside tyre starts to wear. With using the 'setup wheels' I discribed earlier, yep, the setting will be off to start off with, but as the outside tyres wear, you'll end up with a 'sweetspot' where everything is spot on. Then, of course, as the outside tyre carries on wearing, the setting will go out. My question is, overall, do you get a better running car with a 'swetspot', or is it generally better to go with a tweak setting that will be out after a few laps?? It used to be much easier back in the day when Corally cars had a free floating rear end, no tweaking needed!! Cheers guys, Chris.