| rollingcircumference | Floating point in metres | This is the rolling circumference of the tyre. To measure it, place a mark on the tyre where it currently touches the ground and place a mark on the ground aligned with it. Push the car forward until the wheel has made one entire rotation and the marker is pointing at the ground again. Measure the distance in metres between the two marks and that is your rolling circumference. |
| finaldriveratio | Floating point | This is the ratio of the differential i.e. the ratio between the gearbox output shaft and the driven wheels. |
| ratio | Floating point | This is the gear ratio of each gear. For example ratio1 is the ratio of 1st gear. If 1st gear were 2.95:1 then you would specify ratio1=2.95. Up to 10 ratios are supported. |
| marginx | Floating point | This is a setting that reduces the apparent inability to ascertain the gear during events such as a gear change. Specify a margin for each gear, for example margin1=0.5. Typically margin for lower gears should be around 0.5 and for higher gears around 0.1. |