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
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On Sale
Renthal Ultralight Front Sprocket 13T 520 Chain Suzuki RM-Z250 2016-2025 497U-520-13GP
RENTHAL
MSRP: $47.95Now: $43.16Was: $47.95Shaving rotational mass from your drivetrain delivers measurable gains in acceleration and throttle response—exactly what separates competitive lap times from the rest of the field. The Renthal...12121299- SKU:
- 12121299
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- 655M13 NICKEL CHROMIUM STEEL
- MOUNTING POSITION:
- FRONT
- TOOTH COUNT:
- 13
- UNITS:
- EACH
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 520
- TYPE:
- FRONT
MSRP: $47.95Now: $43.16Was: $47.95 -
On Sale
Renthal Front Sprocket 13T 520 Chain Honda CR125R CRF250R 439--520-13GP
RENTHAL
MSRP: $39.95Now: $35.96Was: $39.95A lightweight front sprocket is one of the most direct ways to improve throttle response and acceleration on your Honda dirt bike. The Renthal 13T reduces unsprung weight at the front of your...12120024- SKU:
- 12120024
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- 655M13 NICKEL CHROMIUM STEEL
- MOUNTING POSITION:
- FRONT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 13
- UNITS:
- EACH
- TYPE:
- FRONT
- CHAIN SIZE:
- 520
MSRP: $39.95Now: $35.96Was: $39.95 -
On Sale
Renthal Front Sprocket 14T 520 Chain Honda 439--520-14GP
RENTHAL
MSRP: $39.95Now: $35.96Was: $39.95A lightweight front sprocket is one of the easiest ways to sharpen your Honda's throttle response and reduce unsprung weight where it matters most—at the wheel. The Renthal 14T combines case-hardened...12120025- SKU:
- 12120025
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- TOOTH COUNT:
- 14
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- CHAIN SIZE:
- 520
- MATERIAL:
- 655M13 NICKEL CHROMIUM STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- FRONT
- UNITS:
- EACH
MSRP: $39.95Now: $35.96Was: $39.95 -
On Sale
Renthal 46-Tooth Ultralight Rear Sprocket for Husqvarna TC85 17/14 and 19/16 Blue 441U-428-46GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95Reducing unsprung weight directly improves your Husqvarna's acceleration, handling, and suspension response—critical advantages in competitive racing and technical terrain. The Renthal 46-tooth...12111722- SKU:
- 12111722
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- SPROCKET
- UNITS:
- EACH
- MATERIAL:
- 7075-T6 ALUMINUM
- MOUNTING POSITION:
- REAR
- TOOTH COUNT:
- 46
- TYPE:
- DRIVE
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 47-Tooth Blue Rear Sprocket for Husqvarna TC85 441U-428-47GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a Husqvarna TC85 in motocross or supercross, drivetrain weight directly impacts your bike's acceleration and handling. The Renthal 47-Tooth Rear Sprocket cuts unsprung weight by 66%...12111723- SKU:
- 12111723
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- CHAIN SIZE:
- 428
- COLOR/FINISH:
- BLUE
- TYPE:
- DRIVE
- MATERIAL:
- 7075-T6 ALUMINUM
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 47
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 14T Front Sprocket for Kawasaki KLX110 2002-2020 431--420-14GP
RENTHAL
MSRP: $37.95Now: $34.16Was: $37.95If you're running a KLX110 and want sharper acceleration off the line, a smaller front sprocket is one of the easiest bolt-on upgrades to feel an immediate difference. The Renthal 14T Front Sprocket...R43142014- SKU:
- R43142014
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- SPROCKET
- UNITS:
- EACH
- CHAIN SIZE:
- 420
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- FRONT
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 14
MSRP: $37.95Now: $34.16Was: $37.95 -
On Sale
Renthal 45-Tooth Rear Sprocket for Kawasaki KX125 KX250 KX450 KDX200 KDX220R KDX250 KLX250 KLX300 KLX450R 112U-520-45GESI
RENTHAL
MSRP: $99.82Now: $89.84Was: $99.82Rear sprocket wear directly impacts acceleration, chain longevity, and overall drivetrain efficiency—making a quality replacement essential for serious riders. The Renthal 45-tooth aluminum sprocket...R112B45- SKU:
- R112B45
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- CHAIN SIZE:
- 520
- RIDING STYLE:
- STREET
- TYPE:
- DRIVE
- COLOR/FINISH:
- SILVER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- MATERIAL:
- 7075-T6 ALUMINUM
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 45
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $99.82Now: $89.84Was: $99.82Qty in Cart: 0Quantity:Price:MSRP: $99.82Now: $89.84Was: $99.82Subtotal: -
On Sale
Renthal 47-Tooth Rear Sprocket for Kawasaki KX250F 2004-2016 112U-520-47GESI
RENTHAL
MSRP: $99.82Now: $89.84Was: $99.82If you're running a KX250F, rear sprocket selection directly impacts your power delivery and handling characteristics. The Renthal 47-tooth sprocket cuts unsprung weight by 66% compared to steel...R112B47- SKU:
- R112B47
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- CHAIN SIZE:
- 520
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 47
- COLOR/FINISH:
- SILVER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- TYPE:
- DRIVE
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
MSRP: $99.82Now: $89.84Was: $99.82 -
On Sale
Renthal 48-Tooth Rear Sprocket for Kawasaki KX and KLX Models 112U-520-48GESI
RENTHAL
MSRP: $99.82Now: $89.84Was: $99.82Shaving nearly two-thirds of the weight from your rear sprocket directly translates to sharper acceleration and more responsive handling on the track or trail. The Renthal 48-tooth rear sprocket...R112B48- SKU:
- R112B48
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- CHAIN SIZE:
- 520
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- TYPE:
- DRIVE
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 48
- COLOR/FINISH:
- SILVER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
MSRP: $99.82Now: $89.84Was: $99.82 -
On Sale
Renthal 49-Tooth Rear Sprocket for Kawasaki 520 Chain Models 112U-520-49GESI
RENTHAL
MSRP: $99.82Now: $89.84Was: $99.82Shave 66% of unsprung weight off your rear wheel while gaining measurable acceleration improvements—that's what CNC-machined 7075-T6 aluminum delivers. The Renthal 49-tooth rear sprocket is...R112B49- SKU:
- R112B49
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 49
- UNITS:
- EACH
- CHAIN SIZE:
- 520
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- COLOR/FINISH:
- SILVER
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $99.82Now: $89.84Was: $99.82 -
On Sale
Renthal 50-Tooth Rear Sprocket for Kawasaki 112U-520-50GESI
RENTHAL
MSRP: $99.82Now: $89.84Was: $99.82Reducing unsprung weight is one of the most direct ways to improve acceleration and bike agility—and this Renthal 50-tooth rear sprocket delivers exactly that. By swapping steel for 7075-T6 aluminum,...R112B50- SKU:
- R112B50
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 50
- TYPE:
- DRIVE
- COLOR/FINISH:
- SILVER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- CHAIN SIZE:
- 520
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- STREET
MSRP: $99.82Now: $89.84Was: $99.82 -
On Sale
Renthal 47-Tooth Rear Sprocket for Suzuki RM80 RM85 RM85L and Yamaha YZ80 YZ85 YZ85LW 121U-428-47GPSI
RENTHAL
MSRP: $99.82Now: $89.84Was: $99.82If you're running a Suzuki RM or Yamaha YZ two-stroke, your sprocket takes a beating every time you hit the track or trail. The Renthal 47-tooth rear sprocket cuts rotational mass by 66% compared to...R121A47- SKU:
- R121A47
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
- CHAIN SIZE:
- 428
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- UNITS:
- EACH
- COLOR/FINISH:
- SILVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- MATERIAL:
- 7075-T6 ALUMINUM
- TOOTH COUNT:
- 47
MSRP: $99.82Now: $89.84Was: $99.82 -
On Sale
Renthal Ultralight Rear Sprocket 47T 520 Chain Silver 123U-520-47GYSI
RENTHAL
MSRP: $99.82Now: $89.84Was: $99.82Shaving unsprung weight from your rear wheel dramatically improves acceleration and throttle response—and the Renthal Ultralight 47T Rear Sprocket delivers exactly that. At 66% lighter than steel...R12347- SKU:
- R12347
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
- COLOR/FINISH:
- SILVER
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- CHAIN SIZE:
- 520
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- TOOTH COUNT:
- 47
- TYPE:
- DRIVE
MSRP: $99.82Now: $89.84Was: $99.82 -
On Sale
Renthal 49-Tooth Blue Rear Sprocket for Husqvarna TC85 2014-2023 441U-428-49GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a Husqvarna TC85, sprocket selection directly impacts acceleration, top-end speed, and how your bike responds to throttle input. The Renthal 49-Tooth Rear Sprocket cuts unsprung...12111725- SKU:
- 12111725
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- CHAIN SIZE:
- 428
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 49
- UNITS:
- EACH
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRIVE
- MATERIAL:
- 7075-T6 ALUMINUM
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Ultralight Rear Sprocket 50T Blue 428 Chain Husqvarna TC85 441U-428-50GPBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a Husqvarna TC85 in competitive motocross or enduro events, your sprocket is working overtime—and a heavy steel unit is costing you measurable performance. The Renthal Ultralight...12111726- SKU:
- 12111726
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MOUNTING POSITION:
- REAR
- TYPE:
- DRIVE
- CHAIN SIZE:
- 428
- UNITS:
- EACH
- COLOR/FINISH:
- BLUE
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPROCKET
- TOOTH COUNT:
- 50
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal Front Sprocket 14T 520 Chain Honda XR650R 2000-2007 283--520-14GP
RENTHAL
MSRP: $39.95Now: $35.96Was: $39.95A worn or stock front sprocket limits your Honda XR650R's acceleration potential and durability in demanding off-road conditions. The Renthal 14T front sprocket cuts rotational mass by 10-15% while...12120029- SKU:
- 12120029
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- MATERIAL:
- 655M13 NICKEL CHROMIUM STEEL
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 14
- TYPE:
- FRONT
- UNITS:
- EACH
- CHAIN SIZE:
- 520
MSRP: $39.95Now: $35.96Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $35.96Was: $39.95Subtotal: -
On Sale
Renthal Front 13-Tooth Ultralight Sprocket for Suzuki RM-Z450 RMX450Z 447-520-13GP
RENTHAL
MSRP: $39.95Now: $35.96Was: $39.95A worn or suboptimal front sprocket directly impacts your RM-Z450's power delivery, throttle response, and chain wear. The Renthal 13-Tooth Ultralight Sprocket cuts rotational mass by 10-15%,...12120088- SKU:
- 12120088
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 13
- UNITS:
- EACH
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- SPROCKET
- TYPE:
- COUNTERSHAFT
- CHAIN SIZE:
- 520
- MATERIAL:
- 655M13 NICKEL CHROMIUM STEEL
MSRP: $39.95Now: $35.96Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $35.96Was: $39.95Subtotal: -
On Sale
Renthal 46-Tooth Black Rear Sprocket for KTM 441U-520-46GPBK
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a KTM off-road or racing setup, sprocket weight directly impacts your bike's acceleration and handling characteristics—and this Renthal rear sprocket cuts that rotational mass by...12111877- SKU:
- 12111877
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MOUNTING POSITION:
- REAR
- TOOTH COUNT:
- 46
- TYPE:
- DRIVE
- PRODUCT NAME:
- SPROCKET
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 520
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 48-Tooth Black Rear Sprocket for KTM 441U-520-48GPBK
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95A lighter, more durable rear sprocket directly impacts your KTM's acceleration, fuel efficiency, and chain wear rates. The Renthal 48-tooth design in 7075-T6 aluminum delivers the rigidity of steel...12111878- SKU:
- 12111878
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- 7075-T6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 48
- TYPE:
- DRIVE
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- SPROCKET
- CHAIN SIZE:
- 520
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $104.95Now: $94.46Was: $104.95 -
On Sale
Renthal 47-Tooth Blue Rear Sprocket for Yamaha YZ65 121U-420-47GBBU
RENTHAL
MSRP: $104.95Now: $94.46Was: $104.95If you're running a YZ65, sprocket selection directly impacts your bike's acceleration, top-end speed, and throttle response. The Renthal 47-tooth rear sprocket delivers the weight savings and...12112060- SKU:
- 12112060
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- COLOR/FINISH:
- BLUE
- TYPE:
- DRIVE
- PRODUCT NAME:
- SPROCKET
- RIDING STYLE:
- OFF-ROAD
- TOOTH COUNT:
- 47
- UNITS:
- EACH
- CHAIN SIZE:
- 420
- MATERIAL:
- 7075-T6 ALUMINUM
- MOUNTING POSITION:
- REAR
MSRP: $104.95Now: $94.46Was: $104.95
