Rear
| Alternative 2 AWD cars up to and including week 49, 1998. Lucas rotors. | New thickness | 9.4 mm |
| Minimum thickness | 2.0 mm | |
| Alternative 3 AWD cars, from and including week 50, 1998. Teves rotors. | New thickness | 12.0 mm |
| Minimum thickness | 2.0 mm |
| Alternative 2 AWD cars up to and including week 49, 1998. Lucas rotors. | New thickness | 9.4 mm |
| Minimum thickness | 2.0 mm | |
| Alternative 3 AWD cars, from and including week 50, 1998. Teves rotors. | New thickness | 12.0 mm |
| Minimum thickness | 2.0 mm |