## FANDOM

15 Pages

### Tyre modelEdit

We will only focus on the 3 following parameters in this section : Radius (m), TorusRadius (m) and Width (°)

You have the following input parameters : width of the tyre (W), height of the tyre based on the ratio (R) and rim size (usually 17") (Rim)

Here is a tool to easily change tyres :

https://mega.co.nz/#!oAhAlIBA!a03weRZpqIN6Se7Crpa26lZwXJRNbgz0GDlcxra4A4U  You need geogebra to iopen it (http://geogebra.org)

For the moment, this info is still not confirmed, but based on reverse engineering we suppose this is the tyre model used:

``` Radius
<---->
><=====   : 1/2 Tyre
^^
Torus

Other view:

/
/
/
\     ^
\    | width (in °)
\   v
```

To retrieve the width of the tyre :

• W = Sin(Width) * TorusRadius * 2

Some technical informations about tyres :

## GripEdit

To limit the bike angle in GPB, you need to play with the grip parameter.

Each tyre has 3 coumpounds. Right now are 6 different Tyres available (Qualify, Soft, Softhard, HardSoft, Hard, Wet).

Usually, you have the same compound use for all 3 parts (example : soft tyre, hard tyre, ...).

The Softhard and Hardsoft tyres use different compounds on the tyre (e.g. compound 0 - soft, compound 1 - hard, compund 2 - hard). They are asymmetric tyres.

Here is the compound order:

• c0 = left compound
• c1 = center compound
• c2 = right compound

Each compound has its own properties on different track surfaces (e.g. asphalt1)

```asphalt1
{
dry_grip = 0.98
wet_grip = 0.7
max_wet = 0.5
curve_type = 1
resistance_dry = 1
resistance_wet = 3
}
```

The lean angle is based on the lateral grip the tyres can generate.

It is based on the following paramters : compound, temperature, wear, wet, grove, marbles and road banking.

So to limit the bike angle, you have to reduce the dry (or wet) grip.