RENTHAL Ultralight Aluminium Rear Sprocket (red) for HONDA CR, CRF, XR and BETA RR 1984-2026

The RENTHAL Ultralight (rouge) aluminium rear sprocket is designed for HONDA CR 125, CR 250, CR 500, CRF 150, CRF 230, CRF 250, CRF 450, XR 250, XR 400, XR 600, XR 650 and BETA RR 125, RR 250, RR 300, RR 350, RR 390, RR 400, RR 430, RR 450, RR 480, RR 498 from 1984 to 2026. The rear sprocket is the large sprocket bolted to the rear wheel hub: together with the front sprocket and the chain, it transmits the engine's power to the wheel. Made of aluminium, it weighs much less than a steel sprocket, which cuts unsprung weight and makes the bike feel livelier.

Specifications

• Brand: RENTHAL
• Manufacturer part numbers: 154U-520-47GRRD, 154U-520-52GRRD, 154U-520-53GRRD
• Chain pitch: 520
• Mud-relief grooves
• Material: 7075 aluminium (Ergal)
• Available versions: 47 Teeth: ref. 154U-520-47GRRD; 52 Teeth: ref. 154U-520-52GRRD; 53 Teeth: ref. 154U-520-53GRRD
• Weight: 410 g

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. Aluminium wears faster than steel, especially in sand and mud.

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.

Why RENTHAL?

The Fatbar is made exclusively in the Renthal factory, from the brand's own 7010-T6 alloy: 28.6 mm at the clamps, 22.2 mm at the ends so you keep standard controls, and no crossbar. Its variable wall thickness saves weight and its shot-peened surface improves fatigue resistance, which counts when you're landing jump after jump.

Spare parts and items to plan

• Front sprocket : MOTO-MASTER · INNTECK
• Drive chain : AFAM · RENTHAL 520
• Chain lube : LIQUI MOLY 400 ml · MUC OFF

Frequently asked questions

Aluminium or steel?
Aluminium is lighter and works well for motocross and racing. Steel lasts longer: it's the best choice for enduro, sandy terrain or if you put in a lot of hours.

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:
BETA RR 125 2026
BETA RR 125 2025
BETA RR 125 2024
BETA RR 125 2023
BETA RR 125 2022
BETA RR 125 2021
BETA RR 125 2020
BETA RR 125 2019
BETA RR 125 2018
BETA RR 250 2026
BETA RR 250 2025
BETA RR 250 2024
BETA RR 250 2023
BETA RR 250 2022
BETA RR 250 2021
BETA RR 250 2020
BETA RR 250 2019
BETA RR 250 2018
BETA RR 250 2017
BETA RR 250 2016
BETA RR 250 2015
BETA RR 250 2014
BETA RR 250 2013
BETA RR 300 2026
BETA RR 300 2025
BETA RR 300 2024
BETA RR 300 2023
BETA RR 300 2022
BETA RR 300 2021
BETA RR 300 2020
BETA RR 300 2019
BETA RR 300 2018
BETA RR 300 2017
BETA RR 300 2016
BETA RR 300 2015
BETA RR 300 2014
BETA RR 300 2013
BETA RR 350 2026
BETA RR 350 2025
BETA RR 350 2024
BETA RR 350 2023
BETA RR 350 2022
BETA RR 350 2021
BETA RR 350 2020
BETA RR 350 2019
BETA RR 350 2018
BETA RR 350 2017
BETA RR 350 2016
BETA RR 350 2015
BETA RR 350 2014
BETA RR 350 2013
BETA RR 390 2026
BETA RR 390 2025
BETA RR 390 2024
BETA RR 390 2023
BETA RR 390 2022
BETA RR 390 2021
BETA RR 390 2020
BETA RR 390 2019
BETA RR 390 2018
BETA RR 390 2017
BETA RR 390 2016
BETA RR 390 2015
BETA RR 400 2015
BETA RR 400 2014
BETA RR 400 2013
BETA RR 430 2026
BETA RR 430 2025
BETA RR 430 2024
BETA RR 430 2023
BETA RR 430 2022
BETA RR 430 2021
BETA RR 430 2020
BETA RR 430 2019
BETA RR 430 2018
BETA RR 430 2017
BETA RR 430 2016
BETA RR 430 2015
BETA RR 450 2015
BETA RR 450 2014
BETA RR 450 2013
BETA RR 480 2026
BETA RR 480 2025
BETA RR 480 2024
BETA RR 480 2023
BETA RR 480 2022
BETA RR 480 2021
BETA RR 480 2020
BETA RR 480 2019
BETA RR 480 2018
BETA RR 480 2017
BETA RR 480 2016
BETA RR 480 2015
BETA RR 498 2015
BETA RR 498 2014
BETA RR 498 2013
HONDA CR 125 2007
HONDA CR 125 2006
HONDA CR 125 2005
HONDA CR 125 2004
HONDA CR 125 2003
HONDA CR 125 2002
HONDA CR 125 2001
HONDA CR 125 2000
HONDA CR 125 1999
HONDA CR 125 1998
HONDA CR 125 1997
HONDA CR 125 1996
HONDA CR 125 1995
HONDA CR 125 1994
HONDA CR 125 1993
HONDA CR 125 1992
HONDA CR 125 1991
HONDA CR 125 1990
HONDA CR 125 1989
HONDA CR 125 1988
HONDA CR 125 1987
HONDA CR 125 1986
HONDA CR 125 1985
HONDA CR 125 1984
HONDA CR 250 2007
HONDA CR 250 2006
HONDA CR 250 2005
HONDA CR 250 2004
HONDA CR 250 2003
HONDA CR 250 2002
HONDA CR 250 2001
HONDA CR 250 2000
HONDA CR 250 1999
HONDA CR 250 1998
HONDA CR 250 1997
HONDA CR 250 1996
HONDA CR 250 1995
HONDA CR 250 1994
HONDA CR 250 1993
HONDA CR 250 1992
HONDA CR 250 1991
HONDA CR 250 1990
HONDA CR 250 1989
HONDA CR 250 1988
HONDA CR 250 1987
HONDA CR 250 1986
HONDA CR 250 1985
HONDA CR 250 1984
HONDA CR 500 2001
HONDA CR 500 2000
HONDA CR 500 1999
HONDA CR 500 1998
HONDA CR 500 1997
HONDA CR 500 1996
HONDA CR 500 1995
HONDA CR 500 1994
HONDA CR 500 1993
HONDA CR 500 1992
HONDA CR 500 1991
HONDA CR 500 1990
HONDA CR 500 1989
HONDA CR 500 1988
HONDA CR 500 1987
HONDA CR 500 1986
HONDA CR 500 1985
HONDA CR 500 1984
HONDA CRF 150 2018
HONDA CRF 150 2017
HONDA CRF 150 2016
HONDA CRF 150 2015
HONDA CRF 150 2014
HONDA CRF 150 2013
HONDA CRF 150 2012
HONDA CRF 150 2011
HONDA CRF 150 2010
HONDA CRF 150 2009
HONDA CRF 150 2008
HONDA CRF 150 2007
HONDA CRF 150 2006
HONDA CRF 150 2005
HONDA CRF 150 2004
HONDA CRF 150 2003
HONDA CRF 230 2017
HONDA CRF 230 2016
HONDA CRF 230 2015
HONDA CRF 230 2014
HONDA CRF 230 2013
HONDA CRF 230 2012
HONDA CRF 230 2011
HONDA CRF 230 2010
HONDA CRF 230 2009
HONDA CRF 230 2008
HONDA CRF 230 2007
HONDA CRF 230 2006
HONDA CRF 230 2005
HONDA CRF 230 2004
HONDA CRF 230 2003
HONDA CRF 250 2026
HONDA CRF 250 2025
HONDA CRF 250 2024
HONDA CRF 250 2023
HONDA CRF 250 2022
HONDA CRF 250 2021
HONDA CRF 250 2020
HONDA CRF 250 2019
HONDA CRF 250 2018
HONDA CRF 250 2017
HONDA CRF 250 2016
HONDA CRF 250 2015
HONDA CRF 250 2014
HONDA CRF 250 2013
HONDA CRF 250 2012
HONDA CRF 250 2011
HONDA CRF 250 2010
HONDA CRF 250 2009
HONDA CRF 250 2008
HONDA CRF 250 2007
HONDA CRF 250 2006
HONDA CRF 250 2005
HONDA CRF 250 2004
HONDA CRF 450 2026
HONDA CRF 450 2025
HONDA CRF 450 2024
HONDA CRF 450 2023
HONDA CRF 450 2022
HONDA CRF 450 2021
HONDA CRF 450 2020
HONDA CRF 450 2019
HONDA CRF 450 2018
HONDA CRF 450 2017
HONDA CRF 450 2016
HONDA CRF 450 2015
HONDA CRF 450 2014
HONDA CRF 450 2013
HONDA CRF 450 2012
HONDA CRF 450 2011
HONDA CRF 450 2010
HONDA CRF 450 2009
HONDA CRF 450 2008
HONDA CRF 450 2007
HONDA CRF 450 2006
HONDA CRF 450 2005
HONDA CRF 450 2004
HONDA CRF 450 2003
HONDA CRF 450 2002
HONDA XR 250 2008
HONDA XR 250 2007
HONDA XR 250 2006
HONDA XR 250 2005
HONDA XR 250 2004
HONDA XR 250 2003
HONDA XR 250 2002
HONDA XR 250 2001
HONDA XR 250 2000
HONDA XR 250 1999
HONDA XR 250 1998
HONDA XR 250 1997
HONDA XR 250 1996
HONDA XR 400 2008
HONDA XR 400 2007
HONDA XR 400 2006
HONDA XR 400 2005
HONDA XR 400 2004
HONDA XR 400 2003
HONDA XR 400 2002
HONDA XR 400 2001
HONDA XR 400 2000
HONDA XR 400 1999
HONDA XR 400 1998
HONDA XR 400 1997
HONDA XR 400 1996
HONDA XR 600 2001
HONDA XR 600 2000
HONDA XR 600 1999
HONDA XR 600 1998
HONDA XR 650 2008
HONDA XR 650 2007
HONDA XR 650 2006
HONDA XR 650 2005
HONDA XR 650 2004
HONDA XR 650 2003
HONDA XR 650 2002
HONDA XR 650 2001
HONDA XR 650 2000