RACETECH Worx 2.0 Chain Guide for FANTIC XEF 310, XEF 450, XXF 250, XXF 450 and YAMAHA WRF 450, YZF 250, YZF 450 2024-2026

The RACETECH Worx 2.0 chain guide is designed for FANTIC XEF 310, XEF 450, XXF 250, XXF 450 and YAMAHA WRF 450, YZF 250, YZF 450 from 2024 to 2026. The chain guide, mounted under the swingarm in front of the rear sprocket, keeps the chain properly lined up. It stops the chain from coming off when the suspension is working or when a rock or a rut knocks it sideways: without it, the chain can jam and lock the wheel.

Specifications

• Brand: RACETECH
• Manufacturer part numbers: R-CRUYZFBLNR23, R-CRUYZFBNNR23
• One-piece, replaceable internal wear pad
• Available versions: Blue/black: ref. R-CRUYZFBLNR23; White/black: ref. R-CRUYZFBNNR23
• Engine: 4-stroke

Choosing the colour

All versions fit the same way: the colour is purely a styling choice, to match the bike or to stand out from it.

When to replace it?

• Wear pad grooved by the chain, almost worn through or cracked.
• Guide bent or broken after an impact.
• Chain rubbing on the side plates instead of running through the centre.

Check it every time you wash the bike: a pad worn down to the metal wears the chain, and a bent guide can throw the chain off.

Fitting tips

1. Remove the old guide and clean the mounting points on the swingarm.
2. Offer up the new guide and check that the chain runs through the centre without touching the side plates.
3. Tighten the bolts to the manufacturer's torque, with medium-strength threadlocker.
4. Spin the wheel to check the alignment, then set the chain tension.

Why RACETECH?

The brand has supplied the plastics for Mitch Payton's Pro Circuit Kawasaki team, one of the most successful teams in AMA Supercross, as well as for the Beta Offroad Factory team. Its Worx chain guide is a one-piece design fitted with a removable, self-lubricating TPU internal wear pad.

Spare parts and items to plan

• Drive chain : RENTHAL · RENTHAL 520
• Rear sprocket : RFX FXRS · RFX FXRS 31

Frequently asked questions

Can the wear pad be replaced?
On two-piece guides, yes: you just change the pad when it's worn.

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
FANTIC XEF 310 2026
FANTIC XEF 310 2025
FANTIC XEF 310 2024
FANTIC XEF 450 2026
FANTIC XEF 450 2025
FANTIC XEF 450 2024
FANTIC XXF 250 2026
FANTIC XXF 250 2025
FANTIC XXF 250 2024
FANTIC XXF 450 2026
FANTIC XXF 450 2025
FANTIC XXF 450 2024
YAMAHA WRF 450 2026
YAMAHA WRF 450 2025
YAMAHA WRF 450 2024
YAMAHA YZF 250 2026
YAMAHA YZF 250 2025
YAMAHA YZF 250 2024
YAMAHA YZF 450 2026
YAMAHA YZF 450 2025
YAMAHA YZF 450 2024