When choosing a swing arm for a dirt pit bike, the goal is to improve stability, wheelbase, and suspension compatibility for better off-road handling. This guide highlights five top-searched options suitable for 70cc–160cc pit bikes and 12″–16″ wheels. The profiles help buyers decide who each product is best for, from novice riders seeking simple upgrades to builders pursuing heavy-duty performance.
| Product | Wheel Size Compatibility | Best For | Why It Stands Out |
|---|---|---|---|
| Dirt Pit Bike Steel Swing Arm (YLQYYH) | 12″ and 14″ | Casual riders with 70–125cc bikes | Simple, direct fit for common CRF-style frames; solid steel construction |
| YC Yier 21” Extended Swingarm | 14″ to 16″ | Customization enthusiasts | Longer wheelbase option with bearing set for upgrades |
| TC-Motor 480mm Aluminum Swingarm | 12″ and 14″ | Performance-minded riders | Lightweight aluminum with extended length for improved stability |
| Kemblawolf Heavy-Duty Rear Swing Arm | 12″ wheels | Rugged reliability on SSR/Apollo-Taotao bikes | Durable iron design with precise fit for common 12mm axles |
| ICONSPORTSS Rear Swing Arm + Shock Kit | 12″ wheels | Upgraded suspension with ready upgrade | Includes shock; broad compatibility for mid-range bikes |
Dirt Pit Bike Steel Swing Arm by YLQYYH
The YLQYYH swing arm is designed for 70–125cc dirt pit bikes with CRF-style frames. It fits 12″ and 14″ tires and is compatible with rear disc brake setups. Best for riders seeking a straightforward, budget-friendly upgrade that restores rear-end stability on popular Chinese-made pit bikes. Limitations include a basic design without extended wheelbase, which may not suit riders seeking long-travel performance.
YC Yier 21 Inch Extended Swingarm
The YC Yier extended swingarm increases wheelbase by enabling a transition from 14″ to 16″ rear wheels, with bearings included. This is best for riders who want improved straight-line stability and a broader stance for higher-speed off-road trails. Choose this if you’re converting to larger wheels and need a robust bearing kit; avoid if you don’t require a longer profile or extra bearing parts.
TC-Motor 480mm Aluminum Rear Swingarm
This TC-Motor swingarm features a 480mm aluminum design compatible with 12″ and 14″ wheels on 125cc–190cc pit bikes. It’s best for riders seeking a lighter, stronger upgrade that can improve handling while maintaining a reasonable wheelbase. It requires a 15mm axle to fit properly. A limitation is the need to verify exact model compatibility with your bike’s frame before purchase.
Kemblawolf Heavy-Duty Rear Swing Arm
Designed for 12-inch wheels, the Kemblawolf swing arm supports 70cc–150cc dirt pit bikes, including SSR, Apollo, and Taotao. Its iron construction delivers durability for rough terrains, with a precise 12mm axle hole and a 440mm length. Best for riders who prioritize rugged reliability; consider potential weight heavier than aluminum options for quick, nimble maneuvers.
ICONSPORTSS Rear Swing Arm With Shock Kit
The ICONSPORTSS kit combines a rear swing arm with a shock absorber (260mm/10.2″, 1000lbs) for 70cc–160cc bikes with 12″ wheels. This is best for riders seeking an all-in-one upgrade to restore or enhance suspension behavior. A potential limitation is the kit’s emphasis on a complete assembly, which may require more installation effort than single-arm replacements.
Heavy Duty Aluminum Rear Swingarm for 16” / 18” Wheels
This 16”/18” wheel-ready swingarm from 91.SCS uses high-strength aluminum for durability and has an extended overall length of 590mm (23.2″). It’s best for riders who want increased wheelbase stability and improved control on rough trails. The extended length can alter steering geometry, so verify compatibility with your frame and fuel-injected setup before purchase.
TianDiPRO Rear Swing Arm for 14″ and 16″ Wheels
The TianDiPRO rear swing arm targets 14″ and 16″ wheel conversions for 125cc–160cc dirt bikes. Constructed from high-strength steel, it emphasizes durability and stable performance for off-road riding. Best for builders upgrading older frames; avoid if the bike uses non-standard axle sizes not listed in the specification.
WPHMOTO 14” Rear Swing Arm
The WPHMOTO swing arm is designed for 14″ rear wheels on 125cc–160cc dirt pit bikes like SSR and Apollo Taotao models. Best for riders seeking a straightforward upgrade with reliable compatibility. A limitation is the lack of a shock kit in this specific listing, so an independent shock upgrade may be necessary for enhanced suspension performance.
Buying Guide
Key considerations when selecting a pit bike swing arm:
- Wheel size compatibility: Confirm the wheel diameter (12″, 14″, 16″, or 18″) your bike uses and whether the arm supports needed wheel options.
- Material and weight: Aluminum arms are lighter and often offer better performance, while iron arms provide maximum durability for rugged trails.
- Axle compatibility: Check axle diameter and spacing (commonly 12mm) to ensure a proper fit with your frame and wheel.
- Length and wheelbase: Extended swingarms increase wheelbase for stability; ensure fitment does not adversely affect steering or frame geometry.
- Shock integration: Some listings include a shock kit; others require separate parts. Decide whether you want an all-in-one upgrade or modular components.
- Frame and brake compatibility: Ensure the chosen arm supports your brake type (disc brakes are common) and matches your frame style (CRF-like or Chinese-made clones).
Frequently Asked Questions
- What is the advantage of an extended swingarm?
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An extended swingarm increases wheelbase, which can improve straight-line stability on rough terrain and provide a smoother ride at higher speeds.
- Do I need a new shock when upgrading the swing arm?
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Not always, but many upgrades benefit from a compatible or upgraded shock to maintain optimal suspension geometry and ride feel.
- Will a swing arm upgrade fit every 70cc–160cc pit bike?
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Not every model fits every frame. Verify axle size, wheel size, and frame compatibility before purchase.
- Is aluminum better than iron for swing arms?
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Aluminum is lighter and often provides better handling, while iron is typically stronger and more durable under heavy use.
- Can I mix components from different brands?
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Mixing components can be possible but may require custom adapters or spacers. It’s best to choose a matched kit or confirm exact fitment with the seller.
- Do these swing arms affect bike geometry significantly?
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Yes. Changing wheelbase and axle alignment can alter steering response and geometry. Always check clearance and alignment after installation.