Upgrade your Razor MX500, MX650, or SX500 with our innovative swing arm extension — engineered to give your ride the handling and adjustability of a real dirt bike. New black option available!
What it does
Extends the rear wheel 3.25"–4.25" for improved balance and stability on trails
Eliminates the need for the chain tensioner so you can adjust chain tension like a conventional dirt bike
Slots in the design allow easy fore/aft adjustment after the wheel is installed for a precise fit
What’s included
Left and right swing arm extension arms (Gen 3)
Brake bracket
Axle
All installation hardware and brake caliper fasteners
Reference lines on Gen 3 for slider positioning
Gen 3 upgrades
Notes & installation
Installation requires drilling holes through your existing swing arm. All necessary hardware for mounting and brake caliper attachment is included.
You will need a longer chain to accommodate the increased wheelbase.
We recommend using thread locker (Locktite) on all screws for the best results.
You will need to drill your stock swing arm
Options
Why this upgrade
Safer, more predictable handling on rough terrain
Cleaner drivetrain setup without the chain tensioner
Durable, bolt-on solution for larger wheels that retains compatibility with your original components
Upgrade your Razor MX500, MX650, or SX500 with our innovative swing arm extension — engineered to give your ride the handling and adjustability of a real dirt bike. New black option available!
What it does
Extends the rear wheel 3.25"–4.25" for improved balance and stability on trails
Eliminates the need for the chain tensioner so you can adjust chain tension like a conventional dirt bike
Slots in the design allow easy fore/aft adjustment after the wheel is installed for a precise fit
What’s included
Left and right swing arm extension arms (Gen 3)
Brake bracket
Axle
All installation hardware and brake caliper fasteners
Reference lines on Gen 3 for slider positioning
Gen 3 upgrades
Notes & installation
Installation requires drilling holes through your existing swing arm. All necessary hardware for mounting and brake caliper attachment is included.
You will need a longer chain to accommodate the increased wheelbase.
We recommend using thread locker (Locktite) on all screws for the best results.
You will need to drill your stock swing arm
Options
Why this upgrade
Safer, more predictable handling on rough terrain
Cleaner drivetrain setup without the chain tensioner
Durable, bolt-on solution for larger wheels that retains compatibility with your original components
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