The Honda Grom is one of the most popular mini motorcycles on the market. Riders love it for its compact size, low cost, and easy handling. But many Grom owners want more than just the stock setup. One part often changed is the swingarm — the metal part that holds the rear wheel and connects it to the frame. Upgrading the swingarm can improve both the performance and the appearance of the bike. This guide explains everything you need to know about the Honda Grom swingarm, including types, benefits, and the best options for different riding needs.
What Is a Swingarm and Why Does It Matter?
A swingarm is the main support structure for the rear wheel of a motorcycle. It connects the rear axle to the motorcycle frame. This part allows the rear wheel to move up and down when the bike goes over bumps. The movement helps absorb shocks and keep the tire in contact with the ground.
The swingarm works with the rear suspension to keep the ride smooth and controlled. When the bike turns or hits rough roads, the swingarm helps balance the motion. Without a strong swingarm, the bike may feel unstable or hard to control, especially at higher speeds.
In the Honda Grom, the swingarm is compact and lightweight. It fits the small size of the bike and supports easy handling in city traffic. But its design leaves little room for wide tires or custom styling. This is why many riders upgrade it — to get better function and a fresh look.
Why Modify the Swingarm on a Honda Grom?
The stock swingarm on a Honda Grom is designed for basic riding. It is light, simple, and made for everyday use. It works well for short trips, low-speed riding, and new riders. However, many owners want more than basic function. They want better control, stronger parts, and a custom look. Changing the swingarm helps with all of these.
An upgraded swingarm improves how the bike feels while riding. A stronger swingarm gives better support, especially during fast turns or uneven roads. It reduces flex and helps the rear wheel stay stable. This gives the rider more confidence at higher speeds.
A custom swingarm also lets riders fit larger or wider tires. This is useful for those who want more grip or a bold style. Some swingarms also allow for extended wheelbases. A longer wheelbase improves balance for stunts or straight-line speed. These upgrades support different riding goals, from commuting to performing tricks.
Types of Honda Grom Swingarms
Honda Grom swingarms come in several types. Each type has a different purpose. Some focus on looks. Others improve performance. Choosing the right type depends on how you ride and what you need.
Standard and Extended Swingarms
A standard swingarm keeps the factory wheelbase. It supports quick turns and smooth city riding. An extended swingarm makes the bike longer. It moves the rear wheel farther from the frame. This helps with balance during straight-line riding and stunts. It also lowers the chance of wheel lift during fast take-offs. However, a longer swingarm can reduce turning sharpness.
Billet Aluminum vs. Steel Swingarms
Aluminum swingarms are lighter than steel. They reduce bike weight and improve handling. Billet aluminum is strong and shaped from solid blocks. It is often used in high-end custom parts. Steel swingarms are heavier but more affordable. They can handle stress but add more weight to the bike. The material affects cost, strength, and ride feel.
Custom and Aftermarket Swingarms
Many companies make custom swingarms for the Grom. These come in different shapes, sizes, and finishes. Some have open designs or added brackets for accessories. Others support wider tires or chain adjusters. Aftermarket options also offer color choices and better welding. They give riders more freedom to design their bike and match their build style.
Each type of swingarm fits different riding goals. Knowing the options helps you choose the right upgrade for your setup.
Best Aftermarket Swingarms for Honda Grom
Aftermarket swingarms offer a clear upgrade from the stock part. They improve both the performance and the appearance of the bike. Several brands make high-quality swingarms for the Honda Grom. Each one has different features, materials, and design styles. Choosing the right one depends on your riding needs, budget, and taste.
Chimera Engineering
Chimera is known for its durable, CNC-machined aluminum swingarms. Their products are made for strength, style, and easy fitment. They support wide tire setups and extended wheelbases. Chimera swingarms often include chain sliders and adjustment points. They suit both daily use and track builds. Price is higher, but the quality matches the cost.
MNNTHBX (Man in the Box)
MNNTHBX offers lightweight swingarms designed for aggressive performance. Their parts reduce weight and improve stiffness. Many riders use these swingarms for stunts and sport-style builds. MNNTHBX models support upgraded shocks and larger sprockets. They are easy to install and work well with other Grom mods. Prices are mid-range and fair for the build quality.
TB Parts
TB Parts swingarms are made for everyday riders who want a simple upgrade. They offer both standard and extended types. Their swingarms are solid and budget-friendly. Most models are steel, which makes them heavier but strong. TB Parts is ideal for riders who want a clean upgrade without high costs.
KDF Swingarms
KDF produces custom-designed swingarms with a unique look. Their parts focus on design and strength. Many of their models support longer extensions and wide tire kits. KDF products are best for show builds and riders who want visual impact. Their pricing is higher due to the custom features and materials.
These aftermarket options give you a wide range of choices. Whether you want performance, appearance, or both, there is a swingarm to match your Honda Grom project.
How to Choose the Right Swingarm for Your Ride
Choosing the correct swingarm depends on how and where you ride. Not every swingarm fits every riding style. Some are better for stunts. Others work well for daily use. Some improve looks. Others focus on performance. It is important to match the swingarm to your real needs.
Riding Style
If you use your Honda Grom for city riding or commuting, a standard or slightly extended swingarm is a good choice. It keeps the bike agile and easy to turn. For stunt riding or drag racing, a long swingarm gives better balance and more control during high-speed or wheelie setups. Adventure riders may need stronger, more durable options for rough roads.
Budget and Performance
High-end billet aluminum swingarms cost more but offer top performance. They reduce weight and increase stiffness. Mid-range models made from steel or basic alloys cost less and offer good support for regular riding. If your budget is tight, focus on structure over appearance. A solid, well-made swingarm is more important than a polished finish.
Fit and Compatibility
Not every swingarm fits every Grom model. Check if the part is made for your year. Some swingarms work only with specific wheel sizes or suspension setups. Make sure to confirm length, axle size, and mounting points before buying. This prevents problems during installation.
Style and Finish
Custom swingarms come in different colors, surface finishes, and designs. If appearance is important, choose one that fits your bike’s theme. Some swingarms include slots, welds, or edge cuts that give a bold, modern look. Others have a clean, factory-style finish.
FAQs: Honda Grom Swingarms
Will an extended swingarm reduce turning ability?
Yes. A longer swingarm increases the distance between the wheels. This gives better straight-line stability but reduces how quickly the bike can turn. It is not ideal for tight corners or fast lane changes. For city use, a standard or short extension is more suitable.
Do I need to upgrade the chain or brake line?
It depends on the swingarm length. Longer swingarms require longer chains to fit the new distance between the sprockets. Some setups also need extended rear brake lines. Always measure before you install. Many aftermarket brands list what extras are required with their products.
Is a swingarm swap safe for new riders?
Yes, if installed correctly. A quality swingarm, fitted with the right tools and steps, is safe for new or experienced riders. However, riders should understand how changes affect balance, braking, and handling. If unsure, ask a technician to check your work before riding.
Will changing the swingarm affect the bike’s warranty?
Some warranties may not cover parts changed with non-Honda components. If the swingarm causes damage to other parts, the repair might not be free under the original warranty. Check your policy or speak to your dealer before making changes.
