10.3.6 In order to help prevent a wheel becoming separated in the event of all suspension members connecting it
to the car failing provision must be made to accommodate flexible cables, each with a
cross sectional area
greater than 110mm˛,
the purpose of which is to connect each wheel/upright assembly to the main
structure of the car. The cables and their attachments must also be designed in order to help prevent a
wheel making contact with the driver's head during an accident.
Each cable must have its own separate attachment which :
- is able to withstand a tensile force of
70kN ;
- is able to accommodate a cable end fitting with a minimum inside diameter of 15mm.
Each wheel may be fitted with one or two cables, dependent upon their performance when tested under
FIA Test Procedure 03/07. If one cable is fitted it must exceed the requirements of 3.1.1 of Test Procedure
03/07 and if two are fitted each must exceed the requirements of 3.1.2.
2009 F1 Technical Regulations 33 of 67 17 March 2009
Each cable must exceed 450mm in length and must utilise end fittings which result in a tether bend radius
greater than 7.5mm.