RFX Front Sprockets are CNC Machined from High Tensile Steel and case hardened to 60 Rockwell to resist wear. RFX sprockets also feature lightening holes on selected models but only when durability will not be affected.
Features:
| Bike | Year | Pitch | Part Number |
| KX 250 | 87-89 | 520 | FXFS 21-14 |
| KX 250 | 90-91 | 520 | FXFS 21-14 |
| KX 250 | 92-98 | 520 | FXFS 21-14 |
| KX 500 | 87-04 | 520 | FXFS 21-14 |
| KDX 200 | 84-88 | 520 | FXFS 21-13 |
| KDX 200 | 89-06 | 520 | FXFS 21-13 |
| KDX 220 | 97-05 | 520 | FXFS 21-13 |
| KDX 250 | 91-94 | 520 | FXFS 21-14 |
| KLX 250 | 94-98 | 520 | FXFS 21-14 |
| Bike | Year | Pitch | Part Number |
| YZ 250 | 80-86 | 520 | FXFS 21-14 |
| YZ 250 | 87-93 | 520 | FXFS 21-14 |
| YZ 250 | 94-97 | 520 | FXFS 21-13 |
| YZ 250 | 98 | 520 | FXFS 21-14 |
| YZ 465/490 | 81-88 | 520 | FXFS 21-14 |
| WR 250 | 97 | 520 | FXFS 21-13 |
| WR 250 | 98 | 520 | FXFS 21-14 |
| YFM 350X (WARRIOR) | 87-03 | 520 | FXFS 21-14 |
| YFZ 350 (BANSHEE) | 87-06 | 520 | FXFS 21-14 |
| YFM 350 (RAPTOR) | 04-10 | 520 | FXFS 21-14 |
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British Pounds