Answering the demand for improved ground clearance and rear wheel stance, these swing arm extensions are designed to widen or lengthen your bike’s chassis. Best for riders seeking more stability on uneven terrain, better launch angles for mini bikes, or a simple stance upgrade without major frame work. This guide highlights five solid options, explains who each product is best for, and explains why they were chosen based on build quality and fitment.
| Product | Wheel Style | Fitment Note |
|---|---|---|
| AUTOVIC Swing Arm Extension Kit (4”-5”) | Mini bikes | Razor MX650 SX500 MX500 compatible |
| AUTOVIC Swing Arm Extension Kit (3”-4”) | Mini bikes | Razor MX650 SX500 MX500 compatible |
| AUTOVIC Swing Arm Extension Kit (4”-5” with Silver finish) | Mini bikes | Razor MX650 SX500 MX500 compatible |
| CWTD 21″ Extended Rear Swingarm | Pit bikes / Chinese style | 14″-16″ rear wheel upgrades |
| KTUMININV RSV Swingarm Extension Kit | Coleman B200RSV | Ground clearance upgrade |
AUTOVIC Swing Arm Extension Kit 4”-5” for Razor MX650
Fitment: Razor MX650 SX500 MX500 mini bikes. Material: 6061-T6 billet aluminum for strength and corrosion resistance. Design: Slotted dropout to delete the factory chain tensioner, enabling precise chain tension adjustment for a perfect fit.
Best for: Riders with Razor MX650/MX500 mini bikes who want a straightforward 4”-5” widening solution without modifying major components. Why selected: Combines durable aluminum with a simple install approach and adjustable chain tension for better alignment. Limitation: May require precise alignment of existing components; verify tensioner compatibility on your frame.
AUTOVIC Swing Arm Extension Kit 4”-5” (Silver)
Fitment: Razor MX650 SX500 MX500 mini bikes. Material: 6061-T6 billet aluminum for strength and corrosion resistance. Feature: Slotted dropout design allows manual chain tension adjustment for a precise fit.
Best for: Enthusiasts who prefer a bright Silver finish and easy manual tensioning. Why selected: The same robust alloy with a slightly different finish, offering a consistent expansion solution. Caution: Check finish compatibility with frame hardware if you swap between finishes.
AUTOVIC Swing Arm Extension Kit 3”-4” (Black)
Fitment: Razor MX650 SX500 MX500 mini bikes. Material: 6061-T6 billet aluminum for superior strength and corrosion resistance. Benefit: Manual chain tension adjustment via the slotted dropout design for a precise fit.
Best for: Riders needing a moderate 3”-4” width increase without going to the largest option. Why selected: It maintains the same alloy quality with a narrower extension. Caution: May be too short for riders seeking the widest stance on certain frames.
CWTD 21″ Extended Rear Swingarm Kit
Fitment: 21″ extended rear swingarm; suitable for 14″-16″ rear wheel builds on pit bikes and similar Chinese-style off-road motorcycles. Feature: Includes 15mm bearing setup with pre-installed bearings for rear axle compatibility.
Best for: Builders upgrading rear suspension on small to mid-size dirt bikes or mini bikes with compatible frames. Why selected: A longer steel swingarm adds ground clearance and supports larger wheel upgrades. Limitation: Confirm frame and shock mount clearance before purchase.
KTUMININV RSV Swingarm Extension Kit
Fitment: Coleman B200RSV 2023-2026. Material: Stainless steel with robust load-bearing and corrosion resistance. Benefit: Includes all necessary plates, washers, bolts, and nuts for straightforward installation.
Best for: Riders upgrading Coleman B200RSV models with improved ground clearance. Why selected: Stainless steel construction offers durable performance in varied terrains. Caution: Verify axle and shock clearance on your specific frame to avoid interference.
NICEDOLL Motorcycle Aluminum CNC Swing Arm Extension
Fitment: Monkey Bike 125 (2018-2026). Material: Aluminum; CNC precision manufacturing for durability. Feature: Extends the rear linkage in a lightweight, strong configuration to accommodate larger wheel setups.
Best for: Monkey bike enthusiasts seeking a CNC-machined aluminum option. Why selected: Combines precise construction with a compatibility range for compact motorcycles. Caution: Data notes rear-wheel compatibility; confirm your bike’s axle size and chain alignment before purchase.
New Anime 18-Inch Extended Aluminum Swingarm
Fitment: Universal; Part number listed as Flat Swingarm. Material: Aluminum; extension intended for dirt bikes and mini bikes with compatible frames.
Best for: Riders needing a universal, lightweight extension with straightforward compatibility. Why selected: Offers a simple, cost-effective option for various small-size motorcycles. Caution: Universal fit means you should verify exact frame compatibility and mounting points before ordering.
Buying Guide
- What to consider: Please verify your bike’s model, wheel size, axle diameter, and shock clearance before selecting an extension. A proper fit prevents binding or chain misalignment.
- Material and finish: Aluminum (6061-T6) offers light weight and corrosion resistance; steel variants provide maximum strength for heavier builds. Pick based on expected riding conditions and maintenance preferences.
- Extension length: Common ranges include 3″-4″ and 4″-5″. Choose based on desired stance, ground clearance, and compatibility with your wheel/tork setups.
- Hardware and install ease: Some kits include full mounting kits with bolts and washers; others expect you to source hardware separately. Confirm what’s included to avoid custom fittings.
- Frame compatibility: Not all swingarms fit every frame. Check mounting points, chain tensioning needs, and brake line clearance to ensure safe operation.
- Maintenance considerations: Extended arms can alter chain tension and alignment. Regular checks help ensure safety and longevity of drivetrain components.
FAQ
- Q: Do swing arm extensions require professional installation?
A: It varies by kit. Some are straightforward bolt-on upgrades; others may require alignment and chain tension adjustments that benefit from technical know-how. - Q: Will extensions affect wheel alignment or braking?
A: Yes, improper installation can affect chain line, axle positioning, and brake clearance. Follow the manufacturer’s installation steps and verify alignment after installation. - Q: Are all extensions universal for Razor MX bikes?
A: Not all. Some are designed specifically for Razor MX650/SX500/MX500, while others target different mini bikes or 14″-16″ rear wheels. Check fitment carefully. - Q: Which material is best for durability?
A: 6061-T6 billet aluminum offers a good balance of strength and weight. Stainless steel variants provide maximum durability in harsh conditions. - Q: Can I upgrade to a larger rear wheel with these extensions?
A: Some extensions enable larger wheel setups; confirm wheel diameter compatibility, brake clearance, and chain tension when planning a wheel upgrade. - Q: Do extensions come with bearings or bearings are required separately?
A: Some packages include bearings; others require you to source them separately. Verify the included hardware against your build plan.