Best Swing Arm For Dirt Bike: Compare 10 Pit Bike Fits

#1 · Best Overall

1. TC-Motor 480mm Aluminum

Best for: 12-inch disc-brake pit bikes.

Why it ranks #1: Its 480mm aluminum arm lists 125cc–190cc fitment, 12- or 14-inch wheels, 10mm bearing and bush IDs, and a 15mm axle requirement.

The 480mm aluminum arm pairs a defined length with 10mm bearing and bush dimensions, giving compatible disc-brake pit bikes a specific replacement option. Its listed fit covers several Chinese-made engine sizes and 12- or 14-inch rear-wheel setups, making the key checks wheel, brake, and mounting dimensions.

TC-Motor lists fitment for 125cc, 140cc, 150cc, 160cc, and 190cc bikes, while also naming several Chinese-made pit-bike brands and a broader 110cc–190cc range. The 12-inch tire specification and 14-inch wheel option help narrow the intended wheel setup. Before installation, match the 10mm swingarm bolt, 10mm bearing and bush IDs, and 15mm axle requirement; those dimensions directly affect whether the arm and wheel can mount correctly.

Skip it if you need an arm for a 16-inch rear wheel; this listing specifies 12-inch and 14-inch setups.

Choose this TC-Motor arm for a compatible Chinese pit bike with a disc brake and a listed 12- or 14-inch wheel setup. Check the 480mm length, bolt, bearing, bush, and axle dimensions before planning installation.

Listed on Amazon as: Silver 480mm Aluminum Rear Swingarm For 110cc 125cc 140cc 150cc 160cc 170cc 180cc 190cc Pit Dirt Motor Bike

#2 · Extended Aluminum

2. 91.SCS 590mm Aluminum

Best for: Extended 16- and 18-inch setups.

Why it ranks #2: The 590mm aluminum design targets 16- and 18-inch wheels and 150cc–300cc engines, with a reverse shock mount for specified builds.

A 590mm overall length sets this aluminum swingarm apart for riders seeking an extended setup with 16- or 18-inch wheels. The listing connects the longer arm to improved wheelbase stability and straight-line control, positioning it for rough terrain, high-speed riding, and custom off-road builds.

The 91.SCS arm uses high-strength aluminum and measures 590mm, or 23.2 inches. The listing associates its extended length with wheelbase stability and straight-line control, benefits relevant to rough terrain and faster riding. It is specified for 16- and 18-inch wheel setups and vertical-engine bikes from 150cc to 300cc. A reverse shock mounting design is also identified, so buyers should account for that arrangement when considering installation and suspension layout.

Skip it if you run a 12-inch or 14-inch rear wheel; the 91.SCS 8523P8DedV kit lists those smaller setups.

Consider this 91.SCS arm for a 150cc–300cc vertical-engine bike using 16- or 18-inch wheels, especially when an extended wheelbase suits the ride. Check that the reverse shock mount matches your bike's suspension arrangement.

Listed on Amazon as: Heavy Duty Aluminum Rear Swingarm for 16” / 18” Wheels | Extended Off-Road Swing Arm for Dirt Bike, Pit Bike, Motocross Motorcycle, Vertical Engine 150cc-300cc

#3 · 12-Inch Fit

3. Kemblawolf 440mm Iron

Best for: 12-inch wheel pit-bike fit.

Why it ranks #3: Its 440mm length and 12mm axle hole are stated for 12-inch wheels and 70cc–150cc pit bikes, including SSR, Apollo, and Taotao.

A 440mm length and 12mm axle hole define this iron swingarm for 12-inch-wheel pit bikes. Its stated 80/100-12 tire fit and 70cc–150cc engine range help buyers narrow compatibility, with SSR, Apollo, and Taotao named among the example brands.

Kemblawolf specifies a 440mm arm with a 12mm axle hole, giving buyers two key dimensions to compare with their current setup. The 80/100-12 wheel specification makes the intended rear-wheel size more precise than engine size alone. Its listed range runs from 70cc through 150cc and includes SSR, Apollo, and Taotao bikes. Iron construction is presented for strength and durability in off-road use, while the stated dimensions help inform installation planning.

Skip it if you need a 15mm axle setup; the ICONSPORTSS ICOTK230 lists a 15mm axle.

This Kemblawolf arm fits the stated use case of a 70cc–150cc pit bike with a 12-inch 80/100-12 rear wheel. Verify that the 440mm length and 12mm axle hole suit the bike's mounting arrangement.

Listed on Amazon as: Heavy-Duty Rear Swing Arm for 12-Inch (80/100-12) Wheels, Fits 70cc 90cc 110cc 125cc 140cc 150cc Dirt Pit Bikes, Compatible with SSR Apollo Taotao, 12mm Axle, 440mm Length

#4

4. 91.SCS Rear Swing Arm Kit

Best for: 70cc–160cc pit-bike replacements.

Why it ranks #4: This heavy-duty metal kit covers 70cc–160cc bikes and lists 12-, 14-, and 17-inch wheel compatibility plus a 15mm axle.

This heavy-duty rear swingarm kit spans 70cc–160cc pit bikes and lists compatibility with 12-, 14-, and 17-inch wheels. Its broad stated wheel range gives riders several setup sizes to consider, while the high-strength metal construction is presented for off-road use and motocross riding.

The 91.SCS kit combines high-strength metal construction with stated compatibility across 70cc–160cc bikes and 12-, 14-, and 17-inch wheels. That range can help buyers narrow whether the kit matches a smaller pit-bike setup or a listed larger wheel size. The product names SSR, Apollo, Taotao, Coolster, and SDG among compatible examples. Its 15mm axle specification provides a concrete mounting measurement to compare with the bike's hardware before installation.

Skip it if you ride a 200cc pit bike; the ICONSPORTSS ICOTK230 is listed for 200cc models.

This kit is a candidate for riders with a 70cc–160cc off-road or motocross bike in one of its listed wheel sizes. Check the 15mm axle and the bike's actual dimensions, particularly if your setup differs from the named examples.

Listed on Amazon as: Heavy-Duty Dirt Bike Rear Swing Arm Suspension Kit – Compatible with 12" 14" 17" Wheels – Fits 70cc–160cc Pit Bikes, Motocross, Off-Road Motorcycle, Thumpstar, SSR, Apollo & More

#5 · Small-Bike Steel

5. YLQYYH Steel Swing Arm

Best for: Small rear-disc pit bikes.

Why it ranks #5: The steel arm is aimed at 70cc–125cc CRF-style bikes, with 12- or 14-inch tires and rear disc brakes specified.

Steel construction and stated compatibility with 70cc–125cc CRF-style Chinese pit bikes make this a focused option for smaller trail-bike setups. The listing specifies 12- and 14-inch tires and rear disc-brake type, giving buyers useful starting points for checking whether it suits their bike.

YLQYYH identifies this swingarm for 70cc–125cc dirt pit bikes, including CRF-style bikes made in China and examples such as BBR, TTR, and SSR. Its stated 12- and 14-inch tire compatibility helps narrow the wheel setup, while the rear-disc-brake designation is an important brake-style check before purchase. The steel arm weighs 4.4 pounds, a concrete handling and installation consideration when comparing replacement parts for a small trail bike.

Skip it if you use a rear drum brake; the TC-Motor B08CND5MCT is explicitly listed for disc-brake bikes instead.

Choose this arm when a small 70cc–125cc CRF-style pit bike has a rear disc brake and a listed 12- or 14-inch tire. Check the bike's dimensions and brake arrangement before committing to the replacement.

Listed on Amazon as: Dirt pit Bike Steel Swing Arm 90-125cc small Trail Dirt Bike Swingarm Rear Frame rear fork suspension motorcycle rocker arm

#6

6. YLQYYH 480mm Aluminum

Best for: Aluminum 12- and 14-inch setups.

Why it ranks #6: This 480mm aluminum option lists 125cc–190cc pit bikes and 12- or 14-inch wheels, though it provides fewer axle details than the lead pick.

YLQYYH specifies a 480mm aluminum swingarm for disc-brake pit bikes with either a 12-inch or 14-inch wheel setup. Its listed engine fit spans 125cc to 190cc, giving owners of several common pit-bike sizes a defined replacement length and wheel range to assess.

The aluminum-alloy arm is listed for 125cc, 140cc, 150cc, 160cc, and 190cc pit bikes, with 12-inch 80/100-12 and 14-inch 90/100-14 wheel specifications. That detail helps narrow wheel compatibility, while the disc-brake designation is a separate essential check. Its 480mm length provides another concrete comparison point when replacing an arm. Read the fit description against the bike's actual setup before purchasing or starting installation.

Skip it if you need an arm for a rear drum-brake bike; the listing specifies disc-brake pit bikes.

This YLQYYH arm suits a 125cc–190cc pit bike using a listed 12- or 14-inch wheel and rear disc brake. Check the 480mm length and exact tire setup against your bike before selecting it as a replacement.

Listed on Amazon as: Dirt pit Bike Aluminum Alloy Swing Arm Swingarm motorcycle

#7 · 550mm Extended

7. ICONSPORTSS 550mm Iron

Best for: 14-to-16-inch wheel conversions.

Why it ranks #7: Its 550mm iron construction and 15mm axle suit listed 125cc–200cc bikes and upgrades from 14-inch to 16-inch rear wheels.

The 550mm iron arm pairs a 15mm axle with a stated 14-to-16-inch rear-wheel upgrade path. It targets 125cc, 150cc, 160cc, and 200cc dirt pit bikes, giving riders considering a larger rear wheel a clearly specified length and axle size to compare.

ICONSPORTSS lists this swingarm for 125cc, 150cc, 160cc, and 200cc bikes, with Apollo, Taotao, and SSR named in the title. Its 550mm length and 15mm axle diameter provide concrete fit checks, while the stated move from 14-inch to 16-inch rear wheels defines the upgrade use. Iron construction is specified for strength and longevity, making material and wheel conversion relevant considerations when planning replacement installation.

Skip it if you need a listed fit for a 250cc bike; the 91.SCS MPTK285 lists vertical-engine bikes up to 300cc.

Consider this ICONSPORTSS arm for a 125cc–200cc pit bike when moving from a 14-inch to a 16-inch rear wheel. Check the 550mm length and 15mm axle against the bike before planning the conversion.

Listed on Amazon as: Heavy Duty Metal Swing Arm – 550mm Length, 15mm Axle – Fits 125cc 150cc 160cc 200cc Dirt Pit Bikes Frame Motorcycle Apollo Taotao SSR – Compatible with 14" and 16" Rear Wheels

#8

8. CWTD 450mm Swing Arm

Best for: 12-inch wheels, smaller engines.

Why it ranks #8: The 450mm arm is specifically described for 12-inch rear wheels and 70cc–125cc dirt pit bikes, but offers few additional dimensions.

A 450mm length and 12-inch rear-wheel specification make this CWTD swingarm a defined option for 70cc–125cc dirt pit bikes. The fit range is aimed at smaller-engine setups, and the stated wheel size gives buyers a practical starting point for matching their replacement arm.

CWTD lists compatibility with dirt pit bikes from 70cc to 125cc using 12-inch rear wheels. The 450mm length adds a specific measurement for comparison with the existing arm, while the product names SSR, Apollo, and Taotao as examples. The package includes one swingarm. Because the listing emphasizes checking shape and size rather than relying on model names, compare the actual part dimensions and bike configuration before beginning installation.

Skip it if you are upgrading to a 16-inch rear wheel; the YC Yier TK230 lists a 14-to-16-inch upgrade.

Choose this CWTD arm for a 70cc–125cc dirt pit bike with a 12-inch rear wheel when the 450mm length suits the replacement. Match the arm's shape and dimensions to the bike rather than relying on model names alone.

Listed on Amazon as: 450mm 12" Rear Swing Arm 70/90/110cc/125cc Dirt Pit Bike Swingarm SSR Apollo Taotao

#9

9. YC Yier 21-Inch Iron

Best for: 14-to-16-inch wheel upgrades.

Why it ranks #9: The 21-inch iron arm targets 125cc–200cc bikes upgrading 14-inch wheels to 16-inch, and specifies two 6200 bearings and a 15mm axle.

The 21-inch extended iron arm is explicitly listed for upgrading a 14-inch rear-wheel setup to 16 inches. That makes wheel-size conversion its clearest use case for 125cc–200cc pit bikes, with two included 6200 bearings and a 15mm axle defining important mounting details.

YC Yier specifies an iron swingarm with a 10mm thread, two 6200 bearings, and a 15mm axle. Those details give a buyer concrete dimensions to compare with the bike's mounting hardware before starting an upgrade. Its stated 14-to-16-inch wheel application can help identify a relevant conversion path, but the product also cautions that model names alone do not establish fit. Compare the arm's shape and dimensions with the actual bike.

Skip it if you need a listed fit for a 250cc bike; this arm is specified for 125cc–200cc pit bikes.

This YC Yier arm suits riders planning a 14-to-16-inch rear-wheel upgrade on a 125cc–200cc pit bike. Use the 10mm thread, 15mm axle, bearing details, and arm shape to assess the actual installation fit.

Listed on Amazon as: 21'' Extended Swingarm Iron 15mm Bearings for Pit Dirt Bike 14" 16" Rear Wheels Coolster SSR Apollo Taotao 125cc 140cc 150cc 160cc 200cc 250cc Motorcycle

#10

10. Generic 17-Inch Aluminum

Best for: 17-inch extended replacements.

Why it ranks #10: This extended triangular aluminum arm is listed for 17-inch wheels and several pit-bike families, but provides little fitment or axle detail.

This aluminum replacement arm is specified as an extended 17-inch swingarm for dirt bikes using a disc brake. Its triangular shape gives the product a distinct form, while named compatibility with Honda CRF50, XR50, SDG, SSR, and clones helps identify its intended family of pit bikes.

The Generic listing describes an aluminum extended swingarm for a 17-inch setup and calls out disc-brake use. It names Honda CRF50 and XR50, SDG, SSR, and their clones, with additional description also mentioning TaoTao and Pitster Pro copies. Those examples help focus a compatibility check, while the triangular shape distinguishes its configuration. At 10 pounds, its listed weight is also relevant when planning handling and installation; verify the intended bike and wheel setup.

Skip it if you need a 12-inch wheel arm; the Kemblawolf KWTK202 is specified for 12-inch wheels.

This arm suits buyers seeking an extended 17-inch disc-brake replacement for a listed CRF50, XR50, SDG, SSR, or clone setup. Confirm the bike's actual configuration and the triangular arm's intended fit before installation.

Listed on Amazon as: Replacement 17"-Inch Aluminum Extended Swingarm Swing Arm Disc Brake for Dirt Bikes Compatible with Honda CRF50 XR50 SDG SSR 107 110 125cc Pit Bikes And Their Clones. Triangular Shape