RFX Pro HCS Rear Sprocket YZ125-250 YZF250-450 99-26
RFX Pro HCS Rear Sprocket YZ125-250 YZF250-450 99-26
The RFX Pro HCS Rear Sprocket YZ125-250 YZF250-450 99-26 from RFX is listed to fit 25 models from Yamaha, Fantic and Honda, including Yamaha TT-R 125 (TT-R125) 2021, Yamaha TT-R 230 (TT-R230) 2005-2006 and Yamaha WR 125 (WR125) 1999-2003. It is part of our rear sprockets range.
- Part numbers: one per option, listed under Specifications
- Size: 46 Teeth, 47 Teeth, 48 Teeth, 49 Teeth, 50 Teeth, 51 Teeth, 52 Teeth
- Colour: Steel
- Fits Yamaha: TT-R 125 (TT-R125) 2021, TT-R 230 (TT-R230) 2005-2006, WR 125 (WR125) 1999-2003, WR 250 (WR250) 2007-2022, WR 400 F (WR400F) 1999-2000, WR 426 F (WR426F) 2001-2002, WR 450 F (WR450F) 2003-2023, YZ 125 (YZ125) 1999-2027 and 5 more
- Fits Fantic: XE 125 (XE125) 2021-2026, XE 300 (XE300) 2024-2025, XEF 250 (XEF250) 2022-2026, XEF 310 (XEF310) 2024-2025, XEF 450 (XEF450) 2022-2026, XX 125 (XX125) 2021-2026, XX 250 (XX250) 2022-2026, XXF 250 (XXF250) 2022-2026 and 1 more
- Fits Honda: FX 650 (FX650) 2000, NX 650 DOMINATOR 1988-1994, SLR 650 (SLR650) 1997-1998
- Category: Vehicle Parts › Drivechain › Rear Sprockets
Specifications
| Brand | RFX |
|---|---|
| Manufacturer part numbers | FXRS 31-46 99ST, FXRS 31-47 99ST, FXRS 31-48 99ST, FXRS 31-49 99ST, FXRS 31-50 99ST, FXRS 31-51 99ST, FXRS 31-52 99ST |
Fits these bikes
This RFX part is listed as fitting 25 models. Check your model and year below.
| Make | Model | Years |
|---|---|---|
| Fantic | XE 125 (XE125) | 2021-2026 |
| Fantic | XE 300 (XE300) | 2024-2025 |
| Fantic | XEF 250 (XEF250) | 2022-2026 |
| Fantic | XEF 310 (XEF310) | 2024-2025 |
| Fantic | XEF 450 (XEF450) | 2022-2026 |
| Fantic | XX 125 (XX125) | 2021-2026 |
| Fantic | XX 250 (XX250) | 2022-2026 |
| Fantic | XXF 250 (XXF250) | 2022-2026 |
| Fantic | XXF 450 (XXF450) | 2022-2026 |
| Honda | FX 650 (FX650) | 2000 |
| Honda | NX 650 DOMINATOR | 1988-1994 |
| Honda | SLR 650 (SLR650) | 1997-1998 |
| Yamaha | TT-R 125 (TT-R125) | 2021 |
| Yamaha | TT-R 230 (TT-R230) | 2005-2006 |
| Yamaha | WR 125 (WR125) | 1999-2003 |
| Yamaha | WR 250 (WR250) | 2007-2022 |
| Yamaha | WR 400 F (WR400F) | 1999-2000 |
| Yamaha | WR 426 F (WR426F) | 2001-2002 |
| Yamaha | WR 450 F (WR450F) | 2003-2023 |
| Yamaha | YZ 125 (YZ125) | 1999-2027 |
| Yamaha | YZ 250 (YZ250) | 1999-2027 |
| Yamaha | YZ 250 F (YZ250F) | 2001-2027 |
| Yamaha | YZ 400 F (YZ400F) | 1999 |
| Yamaha | YZ 426 F (YZ426F) | 2000-2002 |
| Yamaha | YZ 450 F (YZ450F) | 2003-2027 |
Product details
Built from certified Hi-Carbon Steel (HCS), RFX Pro Series rear sprockets combine long life, strong performance and good value. They offer greater wear resistance and extra strength compared with mild steel versions.
Because the steel is stronger, the profile can be made lighter, narrowing the weight difference to aluminium sprockets while keeping the durability. Every sprocket is precision laser-cut to tighter tolerances for an accurate fit and reliable performance on every ride.
Key features
- Made from certified Hi-Carbon Steel
- Precision CNC laser cutting
- Profile designed in CAD to save weight
- Mud clearing grooves that help reduce wear
- Rigid design adds torsional strength
- Tighter tolerances for improved performance
Fitting
- Start with the bike on a stand and the rear wheel raised.
- Take off the chain and remove the wheel.
- Hold the hex key still while a spanner loosens the nuts.
- Take out every nut and the old sprocket.
- Clean the hub so it is free of dirt and debris.
- Fit the new sprocket onto the hub so it sits snugly with the bolt holes lined up.
- Clean the sprocket bolts and nuts.
- Put blue Loctite on each bolt and push them through the holes.
- Run the nuts onto the bolts by hand, checking that the locking seals are undamaged and in good order.
- Hold the hex key in place and tighten the nuts in an even pattern.
- Torque the nuts and bolts to the figures in your owner's manual.
- Refit the wheel, making sure the chain is correctly aligned and adjusted to the manufacturer's specification.
Questions about this part
Will the RFX Pro HCS Rear Sprocket YZ125-250 YZF250-450 99-26 fit my bike?
It is listed for 25 models, including Fantic XE 125 (2021-2026), Fantic XE 300 (2024-2025), Fantic XEF 250 (2022-2026), Fantic XEF 310 (2024-2025). The full list is in the "Fits these bikes" table on this page, and the fit check next to the price tells you straight away for your saved bike.
What is the part number?
Each option has its own manufacturer part number, listed under Specifications on this page. Our stock code is 110664-STE-46.
How much is delivery?
Order before 3pm for same day dispatch. UK Next Day delivery is £7.99, and free on orders of £100 or more. Pre 12:00 (£9.99) and Pre 10:00 (£14.99) upgrades are charged at any order value.
Can I return it?
Yes. You can return it within 30 days of delivery for a refund. You pay the return postage unless the item is faulty, damaged or wrong, in which case we cover it. See our Returns page for how. Returns