Upgrading a dirt bike’s swingarm can improve wheel size options, ground clearance, and stability on rough terrain. Swingarm extensions move the rear wheel farther back, creating room for larger rear wheels and better traction on steep trails. This guide highlights five top-rated dirt bike swingarm extensions, covering fitment, material, and installation considerations. Each product is designed for popular pit bikes and electric dirt bikes, and includes essential hardware where applicable. Review the quick summary table below, then explore detailed product sections with key features, benefits, and practical notes to aid installation and use.
| Product | Brand | Key Feature |
|---|---|---|
| CHANGCHENG Swingarm Extend Accessory SurRon Swing Arm Extension | CHANGCHENG | Aluminum CNC, forward foot peg position |
| YC Yier 21” Extended Swingarm | YC Yier | 21” extension, 15mm bearings |
| SUISUITONG 21” Extended Swingarm | SUISUITONG | Heavy-duty iron, 14–16″ wheels compatibility |
| CWTD 450mm Rear Swing Arm | CWTD | Fits 12″ wheels, 70–125cc engines |
| YLQYYH Aluminum Swing Arm | YLQYYH | 480mm aluminum, 12″/14″ wheels |
CHANGCHENG SurRon Swing Arm Extension
The CHANGCHENG swingarm extension is designed for Surron Light Bee X/S and Segway X160/X260 electric dirt bikes. It provides a forward-leaning extension to accommodate larger rear wheels and improve stability on uneven terrain.
Constructed from CNC-machined aluminum alloy, the extension is light yet strong, resisting rust and corrosion and built to withstand rugged riding. After installation, the foot peg position shifts forward, which can enhance rider comfort when climbing steep slopes or navigating rough trails.
The kit is designed for straightforward mounting and may include a brake hose routing option and a rear brake disc guard bracket for integrated protection and routing. Proper installation is essential to maintain braking performance and rear wheel alignment.
YC Yier 21” Extended Swingarm
The YC Yier 21″ extended swingarm is designed to support larger rear wheels, expanding compatibility from 14″ to 16″ rear wheels on compatible pit bikes. It includes a 10mm thread and two pieces of 6200 bearings, with a complete swingarm assembly that aids installation and alignment.
With a 21″ extension, riders can achieve added rear-wheel travel and ground clearance, which is beneficial when riding over rough terrain or obstacles. The kit typically ships with the essential hardware needed to secure the arm and ensure smooth pivoting and stability during operation.
The extension is intended for pit bikes in the 125cc–200cc range and emphasizes reliable bearing support and a robust mounting interface to maintain handling characteristics after installation.
SUISUITONG 21” Extended Swingarm
The SUISUITONG 21″ extended swingarm is built from durable iron, designed to support 125cc–200cc dirt pit bikes and enable a transition from 14″ to 16″ rear wheels. The reinforced structure enhances stability and handling at higher rear-wheel loads and rough terrain.
It offers precise fitment with a 10mm thread and 6201 bearings, facilitating a straightforward installation process. The design emphasizes reliability under demanding riding conditions while maintaining robustness and alignment integrity.
Maintenance considerations include inspecting fasteners after initial rides and ensuring proper lubrication of pivot joints to prevent play and preserve steering response.
CWTD 450mm Rear Swing Arm
The CWTD 450mm rear swing arm is a brand-new unit designed for dirt pit bikes with rear wheels around 12 inches in diameter, compatible with engines in the 70cc–125cc range. The 450mm length provides a different wheelbase geometry that can improve stability on rough sections and steep climbs.
Installation involves replacing the stock swingarm and ensuring proper alignment with the rear axle, brake lines, and chain. This model emphasizes a straightforward fit for riders seeking a solid upgrade without extensive chassis modification.
YLQYYH Aluminum Swing Arm
The YLQYYH aluminum swing arm is a 480mm unit intended for 125cc–160cc pit dirt bikes. It supports both 12″ and 14″ wheels, expanding rear-wheel compatibility for riders who want to experiment with different setups.
Manufactured from aluminum alloy, this swing arm prioritizes light weight and corrosion resistance while offering a robust mounting interface. The kit is typically supplied with protective packaging to safeguard the arm during shipping and handling.
Buying Guide
- Wheel size compatibility: Confirm whether the extension supports your current rear wheel size (12″, 14″, 16″) and how the change affects wheel clearance and chain tension.
- Engine size considerations: Match the swingarm extension to your bike’s engine displacement (ranging from 70cc to 200cc) to ensure proper chain alignment and load handling.
- Material and durability: Aluminum arms are lighter and resistant to rust, while iron arms tend to be sturdier and potentially more affordable. Choose based on riding style and maintenance preference.
- Bearings and hardware: Some kits include bearings (e.g., 15mm bearings) and threaded hardware. Verify what’s included and plan for any additional components you may need.
- Installation complexity: Consider your mechanical experience. Some swingarms require only basic tools, while others may demand alignment checks and brake line routing considerations.
- Brake and chain considerations: Extended swingarms can alter brake line routing and chain length. Check whether a longer chain or brake hose adjustment is necessary and ensure proper tensioning after installation.
- Fitment accuracy: Double-check model compatibility (SurRon, pit bikes, SSR, Taotao, Coolster, etc.). Cross-check mounting points with your frame to avoid misfit or alignment issues.
- Maintenance and safety: After installation, inspect fasteners, bearings, and pivot points regularly. Look for any unusual play, rubbing, or heat-related concerns during rides.
- Warranty and brand support: Prefer products from brands with clear installation guidance and post-purchase support to help address fitment questions or replacement parts.