Find the best pit bike swing arm conversion options to upgrade 14″ and 16″ wheel setups. This guide targets riders looking to increase durability, adjust geometry, or enable larger wheels on common pit bike models. The top picks below cover heavy‑duty steel arms, aluminum variants, and practical extendable swingarms for 125cc to 200cc class bikes. Ready for riders who want better off‑road performance, easier wheel swaps, or longer travel without complex fabrication.
| Product | Best For | Why It Stands Out |
|---|---|---|
| Rear Swing Arm for 14″ 16″ Dirt Pit Bike | Heavy use, durability | Heavy‑duty steel, wide compatibility with 125cc‑160cc engines |
| Silver 480mm Aluminum Rear Swingarm | Intermediate wheel upgrades | Longer aluminum arm for 12″ to 14″ wheels and multiple engines |
| Dirt Pit Bike Steel Swing Arm 90-125cc | Budget builds, classic CRF‑style fits | Steel construction, fits 12″ and 14″ tires on rear |
| Rear Swing Arm 21” Extended Swingarm | 15mm to 18″ wheel upgrades | Extended length for improved stability on 14″ and 16″ wheels |
| 21” Extended Swingarm with Bearings | Large wheel conversions | Includes bearings and 16″ upgrade ready kit |
Rear Swing Arm for 14″ 16″ Dirt Pit Bike — Heavy Duty Upgrade
Best for riders building or upgrading a rugged 14″ or 16″ wheel pit bike with a horizontal engine layout. This heavy‑duty steel swing arm focuses on durability and rigidity to handle rough terrain. It is designed for compatibility with a wide range of pit bike engines in the 125cc to 160cc class, which makes it a versatile upgrade for mixed‑bike garages. Choose this if you want a straightforward swap that improves chassis stiffness and rear tracking on demanding trails. A caution: ensure bolt sizing matches your bike’s swing arm mount.
Silver 480mm Aluminum Rear Swingarm
Best for riders upgrading to a longer aluminum arm on 12″ to 14″ wheels, suitable for a broad set of 125cc to 190cc pit bikes. The 480mm length helps restore geometry after larger wheels or a stretched frame, offering smoother weight distribution and potentially improved stability. Best for enthusiasts who value lighter weight and easier handling. Limitations: aluminum variants may require careful torque management and periodic inspection for bends under heavy loads.
Dirt Pit Bike Steel Swing Arm 90-125cc
Best for budget builds and classic CRF‑style pit bikes, this steel swing arm is designed for 70–125cc engines and supports 12″ to 14″ tires. It provides reliable durability at a lower cost and is well suited for riders who want a straightforward conversion without advanced setup. A caution: verify compatibility with your specific frame mount and disc brake layout to avoid clearance issues.
Rear Swing Arm 21” Extended — 14″ and 16″ Wheels
Best for riders seeking an extended‑length solution when upgrading to larger rear wheels. The 21″ length increases wheelbase, potentially improving stability and weight distribution on 14″ and 16″ wheels. This arm is constructed from durable iron, offering solid rigidity for more aggressive riding styles. Choose this if you want more deliberate geometry changes and longer reach, but be prepared to adjust chain tension and alignment carefully.
21” Extended Swingarm With Bearings
Best for serious wheel upgrades, this 21″ extended arm includes bearings and is compatible with 14″ to 16″ rear wheels on a range of 125cc‑200cc pit bikes. The bearing assemblies help smooth operation and reduce play over time, enabling more precise handling on rough terrain. A limitation: installation may require careful alignment and proper bearing seating to prevent premature wear.
Buying Guide
Key considerations when choosing a swing arm conversion:
- Wheel compatibility: Confirm whether the arm supports 12″–14″ or 14″–16″ rear wheels and if disc brake setups are present.
- Material and weight: Steel arms prioritize durability; aluminum arms offer lighter weight but require attention to heat and stress.
- Length and geometry: Longer arms increase wheelbase, improving stability but affecting steering effort and chain alignment.
- Bearings and hardware: Some arms include bearings or require separate components; verify bolt size and axle compatibility.
- Engine class: Ensure the arm fits the engine displacement and frame design of your pit bike (125cc–200cc is common).
- Installation considerations: Clearance with exhausts, chain tension adjustment, and frame mounting points.
Frequently Asked Questions
- What is a swing arm conversion for pit bikes?
A swing arm conversion replaces the stock rear arm to allow larger wheels, adjust wheelbase, and improve durability for off‑road riding.
- Which material is best for a swing arm upgrade?
Steel offers maximum durability and resistance to bending; aluminum reduces weight for easier handling but may require careful maintenance.
- Do all swing arms fit every pit bike?
No. Fitment depends on frame design, mounting points, wheel size, and brake type. Check the product’s listed compatibility.
- Will a longer swing arm affect steering?
Yes. Extending the wheelbase can improve stability at speed but may require adjustment to steering geometry and chain alignment.
- Is installation difficult for a beginner?
Some basic mechanical skill is helpful. Refer to manufacturer instructions and ensure proper torque and alignment during installation.
- Can I reuse my existing chain and sprockets with a new swing arm?
Often, yes, but you may need different length chains or spacers. Verify chain tensioning range after installation.