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MagBurn is a resistive training device that uses magnets to add drag while cycling. It allows you to work harder at slower speeds. The primary use case is to allow you to work as hard as you want to in group rides.

Adds up to 250 watts of resistance at 30 km/h

Goes on bike frame in seconds

Resistance can be adjusted on-the-fly while riding

Ideal for riding with friends or for safer riding on paths

The back rim must be made from aluminum and cannot have any steel in it.

FAQs

What wheels are compatible with MagBurn?

The rear rim must be fully constructed of aluminum. To verify this, you can run a strong magnet around your rim to check for any steel. Carbon fibre will not work. Most road bike rim sizes should be compatible as MagBurn has been designed to fit rims with widths between 18 – 32mm. The tire can be up to 32mm wide, and cannot have a steel bead. Both rim-brake and disc-brake rims are compatible. If you don’t have an aluminum rim, you can purchase one for <$200.

What frames are compatible with MagBurn?

The seat tube can be up to ~35mm wide and can be up round or aero-shaped (up to ~55mm in length). D-shaped seat tubes have not been tested and likely won’t work very well. The bike frame must also contain a small area behind the seat tube to allow for the adjustment bolt to fit through with enough clearance to prevent scratching the frame. We estimate that MagBurn is compatible with over 90% of frames, but please check your frame if you’re not sure.

What is MagBurn constructed with?

The main components are 3D printed carbon fibre-filled nylon. The metal components are stainless steel or brass (with good corrosion resistance). Rubber bands are used to secure MagBurn to the seat tube. A bead of silicone is used to cushion MagBurn. The arms house high-strength rare earth neodymium magnets.

Will MagBurn damage my frame?

As long as you are using MagBurn as intended and with a compatible frame, there should be no impact to your frame. The thick silicone bead nicely cushions MagBurn against the seat tube with force applied by the strong rubber bands.

How do I adjust the resistance while biking?

This is about as easy as grabbing your water bottle. You simply twist the barrel bolt with your hand. Clockwise increases the resistance by moving the magnets closer together, and counterclockwise does the opposite.

How does MagBurn work?

As the aluminum rim moves between the magnets, the magnetic field induces circular electric currents (eddy currents) in the metal rim due to electromagnetic induction. These eddy currents generate their own magnetic fields that oppose the motion of the magnet (Lenz’s Law), creating a resistive force known as eddy current drag.

Does the rim get hot?

The rim can get somwhat warm, but shouldn’t do any damage to your rim or tire.

Team

We are a team of three engineers from Ontario, Canada who also happen to be brothers. We have work experience at companies like Tesla, Toyota, Suncor, and a couple of startups.

David Wulff

David is a chemical engineer with a love for creating and hacking, and is the one who came up with the MagBurn idea. He’s also completed two Ironman triathlons and is currently training for his third.

Jono Wulff

Jono is a mechanical engineer who recently completed his first triathlon and marathon. He loves mountain biking as well. He currently has a side project where he’s trying to create a more efficient paddle.

Matt Wulff

Matt is a mechatronics engineering student who enjoys enjoys ultimate frisbee and his new favourite sport of inner-tube basketball. He’s in school full time, but in his spare time he’s working on creating a way to mix pharmaceutical drugs on-demand.

Timeline

2024

Design and Testing

July 18, 2025

Kickstarter Launch

Fall 2025

Products ship!