Best Chain And Sprocket for Dirt Bikes and Mini Bikes

#1 · Best Overall

1. RZEOZU MX650 Upgrade Kit

• Weight: 3.5 lb
• Package Dimensions: 10.35 x 7.99 x 3.07 in

Best for: Razor MX650 Upgrade Kit.

Why it ranks #1: A complete upgrade kit with named Razor MX650, MX500, SX500, and RSF650 fitment; it also specifies MY1020 motor compatibility and mounting dimensions.

Compatibility with the Razor MX650, MX500, SX500 Mcgrath and RSF650 gives this RZEOZU kit a clear role: replacing or upgrading the drive system on those listed electric dirt bikes. Its MY1020 motor requirement helps narrow the fit before installation, while stated motor mounting dimensions give buyers concrete points to check.

The kit is listed for several Razor electric dirt bike models and the RSF650 pit bike, so it can serve riders maintaining one of those machines rather than sourcing a generic drive part. The MY1020 motor note is a key compatibility boundary: the listing says that motor type is OK. It also specifies a 10 mm mounting diameter length and 8.5 mm mounting diameter width, giving an owner measurements to compare against the motor before proceeding with the upgrade.

Skip it if you need a kit for a different motor type; the listing specifically identifies MY1020 as OK.

Razor MX650, MX500 or SX500 owners considering a drive-system upgrade can use the listed model and motor details to assess fit. The MY1020 requirement and mounting dimensions remain essential boundaries before installation.

Listed on Amazon as: MX650 Dirtbike Chain and Sprocket Upgrade Kit Replacement for Razor

#2 · Best 520 Kit

2. Vortex 3-Ckg6134 Kit

• Weight: 8 lb

Best for: Ready-To-Install Vortex Kit.

Why it ranks #2: This chain-and-sprocket kit specifies a 520SX3-114 chain and 15/45 gearing, and its chain is listed as ready to install without cutting.

A 520SX3-114 chain supplied ready to install without cutting is the central convenience of this Vortex kit, helping buyers avoid a chain-shortening step during replacement. Its listed 15/45 gearing changes the front sprocket from the stated factory 16/45 setup while retaining the 45-tooth rear sprocket.

The 15/45 kit gearing, compared with the listed 16/45 factory gearing, gives buyers a defined gearing change to consider rather than an unspecified replacement. The chain is a 520SX3-114 and Vortex says its Performance Links kits require no chain cutting, simplifying preparation for installation. The SV3 dual-pocket sealing system is stated to provide up to seven times longer wear life than standard O-ring chains, a maintenance-related advantage grounded in the manufacturer's comparison.

Skip it if you want stock 16/42 gearing; Vortex CK2136 lists that factory-matched ratio and chain size.

Riders seeking a Vortex 520 chain kit with a specified 15/45 setup can value its no-cut installation and SV3 sealing. Check that the gearing change suits the motorcycle before choosing this kit.

Listed on Amazon as: Vortex 3-Ckg6134 Sprocket/Chain Kit Stl/Stl 15/45T Sil Sx3 520-114L Gld

#3 · Best 525 Kit

3. Vortex CK2136 Kit

• Weight: 2.7 lb

Best for: Stock-Gearing Street Chain Kit.

Why it ranks #3: The kit includes a 525SV3-112 chain with factory 16/42 gearing, giving buyers clear chain and sprocket specifications for a street application.

Factory-matched 16/42 gearing and a 525SV3-112 chain make this Vortex kit a clear replacement choice for riders seeking the listed stock setup. Vortex says its kits arrive ready to install without chain cutting, which can simplify preparation while preserving the stated factory gearing.

The kit retains the listed factory 16/42 gearing, making its ratio straightforward for owners seeking that specified setup. Its 525SV3-112 chain is also identified as ready to install without cutting, reducing chain-preparation work. The SV3 chain uses a dual-pocket sealing system that Vortex says lasts up to seven times longer than standard O-ring chains, connecting the sealing design to a stated wear-life benefit for maintenance planning.

Skip it if you need 520 chain gearing; Vortex 3-Ckg6134 specifies a 520SX3-114 chain and 15/45 gearing.

Street-bike owners seeking the listed 16/42 factory gearing and a 525 chain can consider this Vortex kit. Its no-cut installation and SV3 sealing are useful specifics, but the 525 size is a firm fit boundary.

Listed on Amazon as: Vortex CK2136 Chain and Sprocket Kit , Black

#4 · Best Complete Mini-Bike Kit

4. CILOYU 60T 420 Kit

Best for: Complete 60T Mini-Bike Chain Kit.

Why it ranks #4: This package specifies a 60T rear sprocket, 10T sprocket, 42-link jackshaft chain, and 90-link roller chain for listed mini-bike fitments.

A 60-tooth rear sprocket, 10-tooth sprocket and two specified chain lengths give this CILOYU kit a broad set of drivetrain components for compatible mini bikes. Its listed 420 setup targets Predator 196cc, 200cc and 212cc engine applications and names Coleman and Baja models among the fit examples.

The kit lists a 42-link jackshaft clutch chain and a 90-link roller chain alongside 10-tooth and 60-tooth sprockets, helping buyers evaluate the included drive parts as a set. Compatibility includes Coleman BT200X and CT200U models, Baja MB165 and MB200, and several engine sizes. The listing specifies four sprocket mounting holes, making bolt-pattern count an important installation boundary for owners checking their bike.

Skip it if you have a three-hole sprocket mounting pattern; this kit specifies four mounting holes.

Mini-bike owners seeking a 420-chain kit with 60-tooth rear gearing and the listed chain lengths can consider this CILOYU set. Check engine and model compatibility, and ensure the bike uses a four-hole sprocket mount.

Listed on Amazon as: 60 Tooth Sprocket 420 Mini Bike Chain Kit for Coleman CT200U BT200X

#5

5. CILOYU 40T 420 Kit

• Weight: 4.49 lb
• Package Dimensions: 9.45 x 6.97 x 1.65 in

Best for: 40T Coleman Mini-Bike Kit.

Why it ranks #5: The 40T sprocket and 420 chain kit lists fitment across several Coleman, Baja, and TrailMaster mini bikes, with a 40mm bore called out.

A 40-tooth sprocket with a 40 mm bore and 420 chain gives this CILOYU kit defined dimensions for mini-bike replacement work. Its compatibility list spans Coleman CT100U and CT200U models alongside several other mini bikes, helping owners focus on a listed application rather than a universal fit.

The 40 mm bore provides a concrete mounting dimension to compare with the bike, while the 40-tooth sprocket and 420 chain identify the drive components included in the described kit. The listing names Coleman CT100U, CT200U and BT200X applications, plus Predator 212 and other engine and mini-bike combinations. That breadth can help owners identify a candidate fit, but the specific bore and listed model compatibility should guide selection.

Skip it if you need a different bore size or chain specification; this kit lists a 40 mm bore and 420 chain.

Mini-bike owners whose listed application uses a 40 mm bore and 420 chain can use this kit as a replacement candidate. Check the bike and sprocket mounting details, since the stated fit is not universal.

Listed on Amazon as: Mini Bike Sprocket 40T 40mm Bore with 420 Chain for CT100U CT200U

#6

6. CILOYU 60T Sprocket Kit

Best for: 60T Low-Speed Torque Setup.

Why it ranks #6: Its 60T sprocket and 90-link 420 chain target listed Coleman, Baja, and other mini bikes; the listing explicitly identifies a 40mm bore.

A 60-tooth, 40 mm-bore sprocket paired with a 420 chain and 90 links makes this CILOYU kit a defined option for mini-bike drive changes. The listing associates the larger rear sprocket setup with improved low-speed torque, giving riders prioritizing low-speed pull a practical reason to consider it.

The 60-tooth rear sprocket is identified alongside a 420 chain with 90 links, allowing buyers to assess the core drive components and chain length together. Its stated compatibility includes Coleman BT200X, CT200U and CT200U-EX, as well as Baja MB165 and MB200 and other listed mini bikes. The 40 mm bore is an important mounting detail, while the described low-speed torque improvement makes the gearing's intended use clearer.

Skip it if you want a different tooth count; this kit specifies a 60T rear sprocket and 420 chain.

Mini-bike riders seeking a 60-tooth setup for low-speed torque can consider this kit, particularly for listed Coleman and Baja models. The 40 mm bore and 420-chain specification define the fit boundary.

Listed on Amazon as: 60T Sprocket 420 Chain with 90 Links Rear Chain Mini Bike CT200U

#7

7. CILOYU 40T 35 Sprocket

• Weight: 12.6 oz
• Package Dimensions: 5.71 x 5 x 1.69 in

Best for: 40T 35-Chain Replacement Sprocket.

Why it ranks #7: This 40-tooth sprocket is specified for a 35 chain and lists CT100U, CC100X, DB30, and other mini-bike fitments, but no chain is included.

A 40-tooth sprocket with a 37 mm bore and six mounting holes gives this CILOYU replacement several concrete fit details for mini-bike owners. It is specified for a 35 chain and lists Coleman CT100U, Baja DB30, Motovox and other models, helping buyers narrow the application.

The 37 mm bore and six mounting holes, with stated improved mounting-hole spacing, give owners useful dimensions and attachment details to compare with an existing sprocket. Its 40 teeth and 35-chain specification identify the intended drive pairing, while CILOYU describes the tooth count as supporting smooth chain operation and power transfer. Listed models include Coleman CT100U and CC100X, Baja DB30 and Motovox MBX10 and MBX11.

Skip it if you need a chain included with the replacement sprocket; this listing specifies the sprocket for a 35 chain.

Mini-bike owners replacing a 40-tooth sprocket on a listed model can use the 37 mm bore, six-hole layout and 35-chain specification to evaluate fit. The compatible chain is not specified as included.

Listed on Amazon as: High Speed 35 Chain Sprocket 40 Tooth 37mm Bore for Mini Bike CT100U

#8

8. RZEOZU 50T Rear Sprocket

• Weight: 1.5 lb
• Package Dimensions: 8.19 x 7.99 x 1.57 in

Best for: 50T Six-Bolt Mini-Bike Sprocket.

Why it ranks #8: The 50-tooth rear sprocket is compatible with listed mini bikes using a small six-bolt pattern, but the listing does not include a chain.

A 50-tooth rear sprocket for 420 chain, with compatibility listed for a small six-bolt wheel pattern, targets mini-bike owners replacing that specific drive component. RZEOZU names Coleman CT100U and CC100X, Baja DB30 and other models, while highlighting the center mounting hole as a critical fit measurement.

The 50-tooth count and compatibility with 420, #40 and #41 chain give buyers two concrete drivetrain details to check. The listed applications include several mini bikes, and the six-bolt pattern is specified for wheels with a 6-inch rim diameter. RZEOZU also cautions that the center mounting-hole size determines suitability, so measuring that opening before installation is central to avoiding a mismatch.

Skip it if you need a complete chain kit; this listing is for a rear sprocket only.

Mini-bike owners needing a 50-tooth sprocket for a listed six-bolt wheel and compatible chain can consider this RZEOZU part. Confirm the center-hole dimension against the wheel, since that measurement determines suitability.

Listed on Amazon as: 50 Tooth Rear Sprocket 420 Chain Compatible with #40 41 420 Chain

#9

9. PSLER 40T 35 Sprocket

• Weight: 10.5 oz
• Package Dimensions: 5.04 x 5 x 0.83 in

Best for: 35-Chain Mini-Bike Sprocket.

Why it ranks #9: A 40T sprocket designed for a 35 chain, but its fitment information is less specific and it does not provide the chain needed for a complete replacement.

A 40-tooth rear sprocket specified for a size 35 chain gives this PSLER part a straightforward replacement role on compatible mini bikes, pit bikes or go-karts. The listing identifies both the tooth count and chain size, helping buyers evaluate the drive setup before sourcing or fitting the part.

The 40-tooth count is stated for a rear sprocket used with a size 35 chain, connecting the part to a clearly defined chain-and-sprocket setup. PSLER also notes that the sprocket surface may show burn marks from quenching, a process described as intended to improve hardness and durability. The listing frames named models as references for a modified accessory, so buyers should use the chain size and tooth count as key selection details.

Skip it if you need a supplied chain as well as a sprocket; this listing specifies the sprocket for a size 35 chain.

Owners assembling a size 35 chain drive and seeking a 40-tooth rear sprocket can consider this PSLER part. It is a sprocket-only listing, so source the compatible chain separately for the complete drive setup.

Listed on Amazon as: PSLER 35 Chain 40T Sprocket for Most Mini Bike Dirt Bike Pit Bike,Black

#10

10. pinkhatcat Jackshaft Sprockets

• Weight: 10.2 oz
• Package Dimensions: 3.03 x 2.68 x 2.09 in

Best for: Go-Kart Jackshaft Sprocket Pair.

Why it ranks #10: The two 40/41/420 sprockets specify a 3/4-inch bore and keyway, but they are jackshaft parts rather than a complete chain-and-sprocket kit.

Two sprockets, with 14 and 10 teeth, plus a 3/16-inch keyway make this pinkhatcat set a defined jackshaft option for go-karts and mini bikes. Its 3/4-inch bore and stated compatibility with 40/41/420 chain help buyers assess whether the pair suits their transmission setup.

The set includes 14-tooth and 10-tooth sprockets, giving builders two specified components for a jackshaft arrangement rather than a single replacement gear. Both are described for 40/41/420 chain, while the 3/4-inch bore and included 3/16-by-3/16-by-3/4-inch keyway identify important mounting details. The listing connects its accurate tooth profile with power transfer, acceleration and handling, making it relevant to small-vehicle drivetrain assembly.

Skip it if you need a full drive chain included; this set supplies two jackshaft sprockets and a keyway.

Go-kart and mini-bike builders assembling a 40/41/420-chain jackshaft can consider this pair, provided the 3/4-inch bore and keyway match their setup. It supplies sprockets and keyway, not a full chain kit.

Listed on Amazon as: Jackshaft Sprockets 40/41/420 Chain 3/4" Bore 14 Tooth + 10 Tooth 3/16" Keyway for Go Karts Mini Bikes