Lighter.
Faster.
Built to Win.
Smoker Performance engineers ultra-light kart drivetrain components that reduce rotating mass, translating directly to sharper acceleration, cleaner deceleration, and faster lap times. Every gram counts.
7075
Aluminum Grade
219
Chain Pitch
54–66T
Sprocket Range
The Physics of Speed
Reducing rotating mass on kart rear axle components is one of the most mechanically efficient performance gains available. Here is why, stated in verified physics, no marketing spin.
Rotational Kinetic Energy
Rotational kinetic energy is expressed as KE = ½Iω², where I is moment of inertia and ω is angular velocity. Every spinning component stores energy that must be added and removed on every acceleration and braking event.
Moment of Inertia Scales With Radius²
For a ring or sprocket, moment of inertia approximates I = mr². Mass located further from the rotational axis, such as the outer teeth of a sprocket, contributes disproportionately more to rotational inertia than mass near the center.
Rotating Mass Has Double the Penalty
A given reduction in rotating mass saves more energy than the same reduction in non-rotating (chassis) mass, because the drivetrain must overcome both translational and rotational kinetic energy simultaneously. This is a measurable, physics-based advantage.
Direct Drivetrain Impact
Lower rotational inertia in rear-axle components reduces the engine torque required to change wheel speed. Lighter hubs, sprockets, and axle ends also reduce total unsprung mass, improving how the kart responds to track surface changes.
Rotational Kinetic Energy
KE = ½ · I · ω²
I = moment of inertia | ω = angular velocity (rad/s)
As Featured In
Franklin Motorsports Product Spotlight
15 oz
Complete System Weight
Hub + sprocket + carbon fiber guard. One of the lightest complete sprocket systems on the market.
4 Axle Sizes
Hub Availability
30mm · 40mm · 50mm · 1.25" (American karts). Titanium hardware available as an upgrade.
Carbon Fiber
Sprocket Guards
One-piece (68–84T) and two-piece (54–66T). Minimal added mass, full protection.
Engineered Components
#219 Smoker Performance Ultra-Light Sprocket - Two Piece
The lightest two piece sprocket you will find!
Smoker Performance Mini Sprocket Hub
Ultra-light billet hub. Available in four axle sizes including 1.25" for American karts.
Smoker Performance Split Carbon Fiber Sprocket Guard
Two-piece woven carbon fiber. Installs without axle removal.
Drivers Who Run Smoker
“Mike at Smoker Performance clearly knew what he was doing when he designed this product. We reduced rotational inertia exactly where it matters most, and the results on track speak for themselves. Mike not only engineered an outstanding product, he made no compromises in the process -- from materials to execution, everything is the best available. Running his equipment in our LO206 Masters Grand Nationals entry, we started third in the finals and gave them a real run for their money. We will be back on it for the 2026 season, especially after seeing his latest updates. If you are looking for the best-performing hub on the market, this is it. Visit smokerperformance.com to see the full lineup.”
AJ Codalata
SwiftKarting.com
“Huge thanks to Ryan Perry Motorsport for stepping up to help us this weekend, my dad as always, and Josh Hotz Driver Development for the support all year -- and Smoker Performance for having the best gears out there.”
Emory Lyda
Emory Lyda Racing
“Blessed. Win number 6 of the season. Third 100-lapper win in a row. Never give up -- that is the story of this season. Big thanks to Tipton at Hi5 for setup support and everything else. God gets the glory for today. Big thanks to those who help make this happen: Smoker Performance, Hi5 Performance, and CiCi Long.”
Jonathan Westcott
Jonathan Westcott Racing
“Another strong weekend and it is all thanks to you -- our customers -- for making this dream a reality. Congratulations to every winner out there. Outstanding performances by LSR Motorsports, CRG NordAm, and the CRG Factory team on the Masters class win at WKA Karting. We are proud to be part of your journey and we are just getting started.”
Mike
Smoker Performance
Find a Smoker Performance Dealer Near You
Our growing network of authorized dealers spans North America and beyond. Get Smoker Performance components from a knowledgeable local partner.
6+
Authorized Dealers
4
Countries
USA
Manufactured In
7075
Aluminum Grade