RFX Pro Series HCS Rear Sprocket KTM SX/EXC SXF/EXCF 125-530 91-20 (Steel) Various Sizes
RFX Pro Series Hi-Carbon Steel (HCS) sprockets are perfect for the rider looking for longevity and value for money from their sprockets while offering genuine quality not found elsewhere.
Certified Hi-Carbon Steel offers unbeatable wear properties and its added strength over mild steel allows for a lighter profile design, this means the weight increase over aluminium is kept to a minimum.
RFX HCS sprockets are precision Laser cut for more precision and tighter tolerances.
Pro Series HCS Sprocket Features
- Certified Hi-Carbon Steel
- CNC Laser Cut.
- CAD designed profile for lightness.
- Mud clearing grooves to reduce wear.
- Rigid design increases torsional strength.
- Tighter tolerances improve performance.
Fitting Instructions:
- Start with bike on a stand with the rear wheel raised from the ground.
- Remove chain and wheel from bike.
- While holding the Hex key loosen the nuts with a spanner.
- Remove all nuts and old sprocket.
- Clean around the hub making sure clean and free of debris.
- Take the new sprocket and place on hub ensuring a nice snug fit making sure the bolt holes are in position.
- Clean sprocket bolts & nuts.
- Apply Blue Loctite to each bolt and insert in the holes.
- Thread nuts on to bolts by hand ensuring locking seals are intact and in good condition.
- Hold Hex key in place and tighten nuts even pattern.
- Torque nuts and bolts in accordance to your owner’s manual.
- Put wheel back in bike making sure chain is corrected aligned and tightened to manufacturer’s specification.
| Bike | Year | Pitch | Part Number |
| 125 EXC | 91-98 | 520 | FXRS 50-48 |
| 125 EXC | 99-07 | 520 | FXRS 50-50 |
| 125 EXC | 08-16 | 520 | FXRS 50-50 |
| 125 SX | 91-19 | 520 | FXRS 50-50 |
| 125 XC-W | 17-19 | 520 | FXRS 50-50 |
| 144 SX | 07-08 | 520 | FXRS 50-50 |
| 150 SX | 09-19 | 520 | FXRS 50-48 |
| 150 XC-W | 17-19 | 520 | FXRS 50-50 |
| 200 EXC | 11-16 | 520 | FXRS 50-45 |
| 200 EXC/MXC | 00-10 | 520 | FXRS 50-48 |
| 200 EXC/MXC | 98-99 | 520 | FXRS 50-50 |
| 200 SX | 03-06 | 520 | FXRS 50-45 |
| 250 EXC | 91-03 | 520 | FXRS 50-50 |
| 250 EXC | 05-19 | 520 | FXRS 50-50 |
| 250 EXC | 04 | 520 | FXRS 50-52 |
| 250 EXC-F | 02-03 | 520 | FXRS 50-48 |
| 250 EXC-F | 04-19 | 520 | FXRS 50-52 |
| 250 SX | 04-16 | 520 | FXRS 50-48 |
| 250 SX | 90-03 | 520 | FXRS 50-50 |
| 250 SX | 17-19 | 520 | FXRS 50-50 |
| 250 SX-F | 06-16 | 520 | FXRS 50-50 |
| 250 SX-F | 17-19 | 520 | FXRS 50-51 |
| 300 EXC | 05-19 | 520 | FXRS 50-50 |
| 300 EXC | 95-04 | 520 | FXRS 50-52 |
| 300 SX | 90-96 | 520 | FXRS 50-50 |
| 350 EXC-F | 11-19 | 520 | FXRS 50-52 |
| 350 SX-F | 11-19 | 520 | FXRS 50-50 |
| 360 SX | 96-97 | 520 | FXRS 50-50 |
| 380 EXC | 00-01 | 520 | FXRS 50-48 |
| 380 SX | 98-02 | 520 | FXRS 50-50 |
| 400 EXC-F | 00-02 | 520 | FXRS 50-48 |
| 400 LC4/E | 97-99 | 520 | FXRS 50-45 |
| 400 SX-F | 99-02 | 520 | FXRS 50-50 |
| 440 SX | 94 | 520 | FXRS 50-50 |
| 450 EXC-F | 03-19 | 520 | FXRS 50-52 |
| 450 SMR | 05-07 | 520 | FXRS 50-45 |
| 450 SMR | 08-13 | 520 | FXRS 50-48 |
| 450 SX-F | 17-19 | 520 | FXRS 50-48 |
| 450 SX-F | 03 | 520 | FXRS 50-50 |
| 450 SX-F | 13-16 | 520 | FXRS 50-50 |
| 450 SX-F | 04-12 | 520 | FXRS 50-52 |
| 500 EXC | 12-19 | 520 | FXRS 50-50 |
| 505 SX-F | 07-12 | 520 | FXRS 50-52 |
| 520 EXC-F | 00-02 | 520 | FXRS 50-48 |
| 520 SX-F | 98-02 | 520 | FXRS 50-48 |
| 525 EXC-F | 03-12 | 520 | FXRS 50-48 |
| 525 MXC Desert Racing | 03-05 | 520 | FXRS 50-45 |
| 525 SMR | 05 | 520 | FXRS 50-45 |
| 525 SX-F | 03-12 | 520 | FXRS 50-48 |
| 530 EXC-F | 08-11 | 520 | FXRS 50-50 |
| 600 LC4 | 90-92 | 520 | FXRS 50-52 |
| 620 SX (LC4) | 94-98 | 520 | FXRS 50-50 |
| 625 SMC | 05-07 | 520 | FXRS 50-40 |
| 625 SXC | 03-06 | 520 | FXRS 50-40 |
