For street bike enthusiasts planning custom builds, extended swing arms can improve straight-line stability, accommodate larger rear wheels, and tailor suspension feel. The top picks below are chosen for varying riding styles—from rugged off-road-inspired street builds to smooth street-legal cruisers. This guide highlights who each product is best for, plus practical cautions to help you choose confidently. A quick summary table follows to compare core specs at a glance.
| Product | Best For | Key Benefit |
|---|---|---|
| Kemblawolf Extended Rear Swing Arm | Aggressive street riders with custom frames | Longer geometry for stability |
| New Anime 18-Inch Swing Arm | CRF/XR style setups and larger wheels | Wide compatibility with 18″ wheels |
| KBBYT CT70 Compatible Swing Arm | DAX-style bikes and 12″ wheels | Lightweight aluminum upgrade |
| XLJOY Extended +16cm Swingarm | Z50/Monkey style builds | Notable extension for taller stance |
| AUTOVIC 3″-4″ Widening Axle Kit | Razor MX650/SX500 mini bikes | Precise chain adjustment via slotted dropout |
Extended Rear Swing Arm for Off Road Bike
Brand: Kemblawolf. Features include a longer 590mm (approx. 23.2″) reinforced design to enhance straight-line stability, and a forward-position shock mount bracket for alternative suspension tuning. Best for riders seeking a pronounced stance and robust construction for aggressive riding. Caution: Detailed fitment may require compatibility checks with your frame and shock setup.
Dirt Pit Bike Swing Arm for 70-125cc
Brand: YLQYYH. Compatible with 70-125cc dirt pit bikes, 12″ and 14″ tires, rear disc brake type. Best for riders building smaller displacement street-legal or light off-road machines. Caution: May require specific model matching and brake rotor alignment adjustments.
18-Inch Extended Aluminum Swingarm
Brand: New Anime. Fit type: Universal; part number: Flat Swingarm. Designed for 18-inch wheel compatibility with a lightweight aluminum construction. Best for riders seeking a straightforward, larger-wheel upgrade. Caution: Universal fitment means confirm exact frame compatibility and mounting points before purchasing.
CT70 Compatible Aluminum Swing Arm
Brand: KBBYT. The CT70 extended swing arm is tailored for DAX models with precise 12-inch wheel compatibility. Constructed from aluminum for a lightweight, sturdy upgrade. Best for classic-style builds seeking enhanced stability without excessive weight. Caution: Limited to 12-inch wheel configurations; verify wheel sizing before purchase.
AUTOVIC Swing Arm Extension Kit
Brand: AUTOVIC. For Razor MX650/SX500/MX500 mini bikes, includes 3″-4″ widening axle extension with a 6061-T6 billet aluminum build. Best for riders who want a wider stance and precise chain tension control via a slotted dropout. Caution: Designed for specific Razor mini bikes; verify model compatibility and chain alignment needs.
Buying Guide
What should you consider when choosing an extended swing arm?
- Wheel size compatibility: Ensure the arm supports your intended rear wheel diameter (12″, 14″, 16″, 18″).
- Frame and shock compatibility: Check mounting points, shock geometry, and clearance with the exhaust and frame rails.
- Material and weight: Aluminum arms offer lightness; steel arms tend to be tougher but heavier.
- Intended riding style: For street-legal aesthetics with slight off-road capability, prioritize stability and suspension compatibility; for aggressive off-road street builds, prioritize length and rigidity.
- Installation complexity: Some arms require custom brackets or brake rotor alignment; plan for potential professional installation.
FAQ
- Q: Do extended swing arms require new shocks?
A: They can, depending on your setup. Longer arms may change suspension travel and geometry; verify shock clearance and travel compatibility with the new geometry. - Q: Will these fit all 12″ wheels?
A: Not universally. Some arms are model- and wheel-size specific. Always confirm wheel diameter and mounting compatibility before purchase. - Q: Can I install an extended arm on a street-legal bike?
- Q: Do I need professional installation?
- Q: Are extended arms legal for track use?
A: Yes, if the arm matches your frame and wheel size and if local regulations permit the modifications.
A: A professional can ensure correct alignment, torque specs, and safe brake/chain geometry after installation.
A: Track legality varies by jurisdiction and track rules; verify with race organizers before use.