INNTECK Aluminium Rear Sprocket for KTM SX 60, SX 65, HUSQVARNA TC 65 and GAS GAS MC 65 1998-2024

The INNTECK aluminium rear sprocket is designed for KTM SX 60, SX 65, HUSQVARNA TC 65 and GAS GAS MC 65 from 1998 to 2024. 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: INNTECK
• Manufacturer part numbers: 25-71442044, 25-71442045, 25-71442046, 25-71442047, 25-71442048, 25-71442049, 25-71442050, 25-71442051, 25-71442052
• Chain pitch: 420
• Material: 7075 aluminium (Ergal)
• Available versions: 44 Teeth: ref. 25-71442044; 45 Teeth: ref. 25-71442045; 46 Teeth: ref. 25-71442046; 47 Teeth: ref. 25-71442047; 48 Teeth: ref. 25-71442048; 49 Teeth: ref. 25-71442049; 50 Teeth: ref. 25-71442050; 51 Teeth: ref. 25-71442051; 52 Teeth: ref. 25-71442052
• Engine: 2-stroke

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.

Spare parts and items to plan

• Front sprocket : AFAM · PBR
• Drive chain : AFAM A420MX2-G · AFAM A420R1-G
• Chain lube : LIQUI MOLY 400 ml · MUC OFF 400 ml

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:
GAS GAS MC 65 2024
GAS GAS MC 65 2023
GAS GAS MC 65 2022
GAS GAS MC 65 2021
HUSQVARNA TC 65 2024
HUSQVARNA TC 65 2023
HUSQVARNA TC 65 2022
HUSQVARNA TC 65 2021
HUSQVARNA TC 65 2020
HUSQVARNA TC 65 2019
HUSQVARNA TC 65 2018
HUSQVARNA TC 65 2017
KTM SX 60 2001
KTM SX 60 2000
KTM SX 60 1999
KTM SX 60 1998
KTM SX 65 2024
KTM SX 65 2023
KTM SX 65 2022
KTM SX 65 2021
KTM SX 65 2020
KTM SX 65 2019
KTM SX 65 2018
KTM SX 65 2017
KTM SX 65 2016
KTM SX 65 2015
KTM SX 65 2014
KTM SX 65 2013
KTM SX 65 2012
KTM SX 65 2011
KTM SX 65 2010
KTM SX 65 2009
KTM SX 65 2008
KTM SX 65 2007
KTM SX 65 2006
KTM SX 65 2005
KTM SX 65 2004
KTM SX 65 2003
KTM SX 65 2002
KTM SX 65 2001
KTM SX 65 2000
KTM SX 65 1999
KTM SX 65 1998