Dirt Bike Drivetrain
Dirt Bike Drivetrain Parts at JJ Motorsports
Enhance your dirt bike’s power transfer with premium drivetrain parts from JJ Motorsports. Find heavy-duty chains, front and rear sprockets, and clutch components designed to withstand intense riding demands. Combine these with other motocross gear and parts to maximize acceleration and ride efficiency on the track or trail.
Shop trusted brands like JT Chains for sealed chains and Renthal for ultralight sprockets. Explore related categories such as Dirt Bike Engine Parts for power upgrades or Dirt Bike Exhaust for complete tuning.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
On Sale
Renthal 53-Tooth Rear Sprocket for Honda Red 154U-520-53GRRD
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a 53-tooth setup, you know every gram of unsprung weight matters for acceleration and chassis response. The Renthal aluminum rear sprocket delivers that advantage while maintaining...12110180- SKU:
- 12110180
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- TOOTH COUNT:
- 53
- MATERIAL:
- 7075-T6 ALUMINUM
- PRODUCT NAME:
- SPROCKET
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- RED
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- DRIVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 47-Tooth Black Rear Sprocket for Kawasaki 121U-428-47GPBK
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a Kawasaki off-road machine, sprocket selection directly impacts acceleration, chain wear, and overall drivetrain reliability. The Renthal 47-tooth rear sprocket cuts unsprung...12110281- SKU:
- 12110281
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- CHAIN SIZE:
- 428
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 47
- UNITS:
- EACH
- MOUNTING POSITION:
- REAR
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Black 48-Tooth Rear Sprocket for 428 Chain 121U-428-48GPBK
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a 428 chain on your Kawasaki, upgrading to a lightweight aluminum sprocket directly improves throttle response and reduces unsprung weight at the rear wheel—translating to faster...12110282- SKU:
- 12110282
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MATERIAL:
- 7075-T6 ALUMINUM
- MOUNTING POSITION:
- REAR
- CHAIN SIZE:
- 428
- PRODUCT NAME:
- SPROCKET
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 48
- TYPE:
- DRIVE
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 47-Tooth Blue Rear Sprocket for Yamaha YZ85 121U-428-47GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a YZ85 in competitive or recreational dirt bike racing, sprocket weight directly impacts your power-to-weight ratio and throttle response. The Renthal 47-Tooth Rear Sprocket shaves...12110285- SKU:
- 12110285
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- 7075-T6 ALUMINUM
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 47
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 48T Blue Rear Sprocket for Yamaha YZ85 1993-2026 121U-428-48GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a YZ85, sprocket wear directly impacts acceleration, chain life, and overall drivetrain efficiency. The Renthal 48T Blue Rear Sprocket delivers the lightweight performance advantage...12110286- SKU:
- 12110286
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- MATERIAL:
- 7075-T6 ALUMINUM
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 48
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- BLUE
- UNITS:
- EACH
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 49T Blue Rear Sprocket 428 Chain 121U-428-49GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a 428 chain on your dirt bike or ATV, sprocket wear directly impacts throttle response and overall drivetrain efficiency. The Renthal 49T Blue Rear Sprocket cuts weight by 66%...12110287- SKU:
- 12110287
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MATERIAL:
- 7075-T6 ALUMINUM
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- UNITS:
- EACH
- CHAIN SIZE:
- 428
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 49
- MOUNTING POSITION:
- REAR
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 50-Tooth Aluminum Rear Sprocket for Yamaha 121U-428-50GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95A lighter rear sprocket directly translates to reduced unsprung weight, sharper acceleration, and improved handling—critical advantages whether you're racing or pushing hard on technical terrain. The...12110288- SKU:
- 12110288
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MOUNTING POSITION:
- REAR
- MATERIAL:
- 7075-T6 ALUMINUM
- CHAIN SIZE:
- 428
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 50
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- UNITS:
- EACH
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Red 49-Tooth Rear Sprocket for Honda CR80R CR85R CRF150R 189U-420-49GRRD
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95Shave unsprung weight from your Honda while maintaining the durability needed for competitive riding. The Renthal 49-tooth rear sprocket cuts 66% of the mass compared to steel, directly improving...12110289- SKU:
- 12110289
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- UNITS:
- EACH
- CHAIN SIZE:
- 420
- COLOR/FINISH:
- RED
- MOUNTING POSITION:
- REAR
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 49
- TYPE:
- DRIVE
MSRP: $104.95Now: $94.46Was: $104.95Qty in Cart: 0Quantity:Price:MSRP: $104.95Now: $94.46Was: $104.95Subtotal: -
On Sale
Renthal 50-Tooth Rear Sprocket Red 420 Chain Honda CRF CR 189U-420-50GRRD
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95Shaving nearly two-thirds of the weight off your rear sprocket directly translates to faster acceleration and reduced rotational inertia—critical advantages in competitive motocross and off-road...12110290- SKU:
- 12110290
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 420
- COLOR/FINISH:
- RED
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- UNITS:
- EACH
- TOOTH COUNT:
- 50
- TYPE:
- DRIVE
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Red 55T Rear Sprocket for Honda CR80R CR85R CRF150R 189U-420-55GRRD
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95Rotational mass directly impacts acceleration and handling—the Renthal Red 55T sprocket cuts weight by 66% compared to steel while maintaining the durability needed for competitive riding and...12110291- SKU:
- 12110291
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPROCKET
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- UNITS:
- EACH
- CHAIN SIZE:
- 420
- COLOR/FINISH:
- RED
- TOOTH COUNT:
- 55
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Red 56-Tooth Rear Sprocket for Honda CR80R CR85R CRF150R 189U-420-56GRRD
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a Honda CR80R, CR85R, or CRF150R, the factory rear sprocket is likely costing you acceleration and adding unnecessary rotational mass. The Renthal Red 56-Tooth Rear Sprocket cuts...12110292- SKU:
- 12110292
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- UNITS:
- EACH
- COLOR/FINISH:
- RED
- MATERIAL:
- 7075-T6 ALUMINUM
- TOOTH COUNT:
- 56
- CHAIN SIZE:
- 420
- MOUNTING POSITION:
- REAR
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Black 50-Tooth Rear Sprocket for Kawasaki KX100 KX80 KX85 191U-420-50GEBK
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95The Renthal 50-Tooth Rear Sprocket delivers the acceleration and reliability your Kawasaki KX demands, whether you're pushing hard on the track or tackling technical terrain. Built from 7075-T6...12110298- SKU:
- 12110298
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- TYPE:
- DRIVE
- UNITS:
- EACH
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 50
- COLOR/FINISH:
- BLACK
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 420
- MOUNTING POSITION:
- REAR
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 51T Rear Sprocket for Kawasaki KX100 KX80 KX85 Black 191U-420-51GEBK
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a KX80, KX85, or KX100 in competitive conditions, sprocket weight directly impacts your bike's responsiveness and acceleration off the line. The Renthal 51T rear sprocket cuts...12110299- SKU:
- 12110299
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- UNITS:
- EACH
- CHAIN SIZE:
- 420
- COLOR/FINISH:
- BLACK
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 51
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Ultralight Rear Sprocket 52T Black 191U-420-52GEBK
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95Shaving weight off your drivetrain while maintaining durability is critical for acceleration and handling—especially in competitive riding where every tenth matters. The Renthal Ultralight 52T...12110300- SKU:
- 12110300
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- UNITS:
- EACH
- CHAIN SIZE:
- 420
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 7075-T6 ALUMINUM
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 52
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 49-Tooth Aluminum Rear Sprocket for Husqvarna Blue 224U-520-49GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a Husqvarna off-road bike in competitive or high-demand riding conditions, sprocket wear directly impacts your acceleration, chain longevity, and overall drivetrain reliability. The...12111332- SKU:
- 12111332
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COLOR/FINISH:
- BLUE
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 520
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- DRIVE
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 49
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 50-Tooth Blue Rear Sprocket for Husqvarna 224U-520-50GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95A worn or stock sprocket robs your Husqvarna of efficiency and acceleration response. The Renthal 50-Tooth Rear Sprocket delivers measurable performance gains through precision engineering and weight...12111333- SKU:
- 12111333
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- COLOR/FINISH:
- BLUE
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 50
- TYPE:
- DRIVE
- MOUNTING POSITION:
- REAR
- CHAIN SIZE:
- 520
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 51-Tooth Blue Anodized Rear Sprocket for Husqvarna 224U-520-51GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a Husqvarna in competitive motocross or demanding off-road conditions, sprocket wear directly impacts your power delivery and chain longevity. The Renthal 51-Tooth Rear Sprocket...12111334- SKU:
- 12111334
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- COLOR/FINISH:
- BLUE
- MATERIAL:
- 7075-T6 ALUMINUM
- CHAIN SIZE:
- 520
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 51
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Rear Sprocket 38T Orange 415 Chain 48041538POR
RENTHAL
MSRP: $97.95Now: $88.16Was: $97.95If you're running a KTM off-road machine, sprocket selection directly impacts your acceleration, top speed, and how your bike responds to terrain changes. The Renthal 38T rear sprocket combines...12111201- SKU:
- 12111201
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- TYPE:
- DRIVE
- MATERIAL:
- 7075-T6 ALUMINUM
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- CHAIN SIZE:
- 415
- COLOR/FINISH:
- ORANGE
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 38
- UNITS:
- EACH
MSRP: $97.95Now: $88.16Was: $97.95 -
On Sale
Renthal 40-Tooth Rear Sprocket for KTM 50 SX 415 Chain Orange 48041540POR
RENTHAL
MSRP: $97.95Now: $88.16Was: $97.95If you're running a KTM 50 SX and want to shave rotating mass without sacrificing durability, the Renthal 40-Tooth Rear Sprocket is the upgrade that delivers. At 66% lighter than steel, this...12111203- SKU:
- 12111203
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TYPE:
- DRIVE
- CHAIN SIZE:
- 415
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 40
- COLOR/FINISH:
- ORANGE
- UNITS:
- EACH
MSRP: $97.95Now: $88.16Was: $97.95 -
On Sale
Renthal 36-Tooth Black Rear Sprocket for KTM 50 SX 49141536PBK
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95Unsprung weight directly impacts your KTM 50 SX's throttle response and cornering performance—this Renthal 36-tooth rear sprocket cuts weight by 66% compared to steel alternatives without sacrificing...12111208- SKU:
- 12111208
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 36
- UNITS:
- EACH
- MATERIAL:
- 7075-T6 ALUMINUM
- MOUNTING POSITION:
- REAR
- COLOR/FINISH:
- BLACK
- CHAIN SIZE:
- 415
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
MSRP: $104.95Now: $94.46Was: $104.95
