INNTECK Fusion Dual-Material Steel/Aluminium Rear Sprocket (red) for GAS GAS 2021-2027

The INNTECK Fusion (rouge) dual-material steel and aluminium rear sprocket is designed for GAS GAS EC 125, EC 250, EC 300, ECF 250, ECF 350, ECF 450, ECF 500, MC 125, MC 250, MCF 250, MCF 350, MCF 450 from 2021 to 2027. The rear sprocket is the large sprocket bolted to the rear wheel hub. A dual-material sprocket combines steel teeth, which resist wear, with an aluminium centre that keeps the weight down: you get the service life of steel at a weight close to that of an aluminium sprocket.

Specifications

• Brand: INNTECK
• Manufacturer part numbers: 23-724-48RD, 23-724-49RD, 23-724-50RD, 23-724-51RD, 23-724-52RD
• Steel toothed ring, aluminium centre
• Available versions: 48 Teeth: ref. 23-724-48RD; 49 Teeth: ref. 23-724-49RD; 50 Teeth: ref. 23-724-50RD; 51 Teeth: ref. 23-724-51RD; 52 Teeth: ref. 23-724-52RD

Choosing the right number of teeth

For the same bike, go for the number of teeth of your current sprocket (it's often stamped on it). More teeth on the rear sprocket shortens the gearing: more acceleration, lower top speed. Fewer teeth lengthens it. Even one or two teeth make a clear difference; if you change a lot, the chain length may need adjusting.

When to replace it?

• Teeth worn to a point or into a hook shape, worn down on one side only.
• Chain that lifts away from the sprocket when you pull it rearwards.
• Drivetrain noise, jerkiness or a chain that jumps under load.

Check the sprocket every time you service the chain. Always replace the rear sprocket, front sprocket and chain together: a new part running with worn ones wears out very quickly.

Fitting tips

1. Clean the hub and check that it isn't cracked or distorted.
2. Fit the sprocket the right way round (markings facing out) and tighten the bolts in a criss-cross pattern to the manufacturer's torque, with medium-strength threadlocker if the manual calls for it.
3. While you're at it, replace the front sprocket and the chain if they're worn.
4. Set the chain tension as per the manual, with the wheel aligned, then lube it with a suitable chain lube.
5. Recheck the bolt tightness and the chain tension after the first ride.

Spare parts and items to plan

• Front sprocket : JT SPROCKETS · AFAM
• Drive chain : AFAM · RENTHAL
• Chain lube : LIQUI MOLY 400 ml · MUC OFF 400 ml

Frequently asked questions

What's the advantage over an aluminium sprocket?
The steel teeth last much longer, especially in mud or sand, for barely any extra weight.

Should the chain be replaced at the same time?
Yes, if it's worn: a stretched chain wears out a new sprocket in a few hours.

Compatibility

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

Fits:
GAS GAS EC 125 2027
GAS GAS EC 125 2026
GAS GAS EC 125 2025
GAS GAS EC 250 2027
GAS GAS EC 250 2026
GAS GAS EC 250 2025
GAS GAS EC 250 2024
GAS GAS EC 250 2023
GAS GAS EC 250 2022
GAS GAS EC 250 2021
GAS GAS EC 300 2027
GAS GAS EC 300 2026
GAS GAS EC 300 2025
GAS GAS EC 300 2024
GAS GAS EC 300 2023
GAS GAS EC 300 2022
GAS GAS EC 300 2021
GAS GAS ECF 250 2027
GAS GAS ECF 250 2026
GAS GAS ECF 250 2025
GAS GAS ECF 250 2024
GAS GAS ECF 250 2023
GAS GAS ECF 250 2022
GAS GAS ECF 250 2021
GAS GAS ECF 350 2027
GAS GAS ECF 350 2026
GAS GAS ECF 350 2025
GAS GAS ECF 350 2024
GAS GAS ECF 350 2023
GAS GAS ECF 350 2022
GAS GAS ECF 350 2021
GAS GAS ECF 450 2027
GAS GAS ECF 450 2026
GAS GAS ECF 450 2025
GAS GAS ECF 450 2024
GAS GAS ECF 500 2027
GAS GAS ECF 500 2026
GAS GAS ECF 500 2025
GAS GAS ECF 500 2024
GAS GAS MC 125 2027
GAS GAS MC 125 2026
GAS GAS MC 125 2025
GAS GAS MC 125 2024
GAS GAS MC 125 2023
GAS GAS MC 125 2022
GAS GAS MC 125 2021
GAS GAS MC 250 2027
GAS GAS MC 250 2026
GAS GAS MC 250 2025
GAS GAS MC 250 2024
GAS GAS MC 250 2023
GAS GAS MC 250 2022
GAS GAS MCF 250 2027
GAS GAS MCF 250 2026
GAS GAS MCF 250 2025
GAS GAS MCF 250 2024
GAS GAS MCF 250 2023
GAS GAS MCF 250 2022
GAS GAS MCF 250 2021
GAS GAS MCF 350 2027
GAS GAS MCF 350 2026
GAS GAS MCF 350 2025
GAS GAS MCF 350 2024
GAS GAS MCF 350 2023
GAS GAS MCF 350 2022
GAS GAS MCF 450 2027
GAS GAS MCF 450 2026
GAS GAS MCF 450 2025
GAS GAS MCF 450 2024
GAS GAS MCF 450 2023
GAS GAS MCF 450 2022
GAS GAS MCF 450 2021