RS 4-2-1 - The RS 4-2-1 is a medium friction compound and very easy on the discs (rotors). It is OE on various Super Sports Cars. Suitable for street and light track use such as track days or driving education.
Based on the Pagid Application Guide, this pad fits the following applications.
| Make | Model | Year | Front | Rear |
| BMW | 728 - 735 [E38] | 94 - 01 | 1427 | 2685 |
| BMW | 830 - 850 [E31] | 90 - | 1427 | 2685 |
| Bugatti | EB 110 |
| 1427 | 1427 |
| Ferrari | F512M & 550 | - | 1427 | 1203 |
| Ferrari | 575 M Maranello | 02 - 06 | 1427 | 1203 |
| Maserati | Coupe | 02 - | 1427 | 1203 |
| Maserati | Spyder | 02 - | 1427 | 1203 |
| Nissan | Skyline GTR | 89 - 95 | 1427 | 1587 |
| Nissan | 350 Z Coupe Track | 02 - | 1427 | 1587 |
