The Treadmill Bike: A Machine That Solves Walking Outside by Letting You Walk Outside on a Machine
Someone mounted a treadmill on bicycle wheels and charged hundreds of dollars for the privilege of walking at the speed of walking while pushing a contraption
I need you to understand what this product is before I can explain why it shouldn't exist.
The Treadmill Bike is a treadmill belt mounted on a frame with bicycle wheels. You walk on the belt. Your walking motion turns the wheels. The wheels propel you forward. At the speed of walking. Because you are walking.
You are walking outside on a treadmill to go the same speed you would go if you were walking outside without a treadmill. The machine converts walking into walking. The input is walking. The output is walking. The value added is a $500 frame, two wheels, and the guarantee that everyone who sees you will stop what they're doing to process what they're looking at.
This is not exercise equipment. This is a philosophy class. The Treadmill Bike is the physical manifestation of the question "If you're already walking, and the machine lets you walk, and you end up at the same place at the same speed, what has the machine done?" The answer is: it has made walking worse. It has added weight, cost, storage requirements, and public attention to an activity that previously required only the intention to move forward.
The Treadmill Bike is the most over-engineered solution to a non-problem in fitness history, and fitness history includes a product that helps you squeeze a spring between your thighs.
The Vision: The Joy of Walking, but With More Machine
The Treadmill Bike was created — presumably in a workshop where irony goes to die — for people who enjoy the walking motion of a treadmill but want to do it outside. These people exist, theoretically, in the same way that people who enjoy the taste of water but wish it were carbonated exist — they're real, but the problem they have doesn't typically require hundreds of dollars and an engineering degree to solve.
The value proposition, as far as one can be identified: a treadmill provides a consistent, flat surface. Walking outside involves uneven terrain. The Treadmill Bike lets you walk on a consistent, flat belt while traveling through the inconsistent, uneven world. This is solving a problem that sidewalks solved, but with more parts.
The machine also provides a handlebar for stability, which means you're essentially pushing a wheeled walker with a treadmill deck. This is a mobility device for people who don't need a mobility device. It's a walker that makes you less mobile by adding fifty pounds of machine to the act of walking.
The Glorious User Experience
Dave from Minneapolis, MN — ★☆☆☆☆
"I took the Treadmill Bike out on a bike path. I was walking at approximately 3.5 mph. Cyclists passed me. Joggers passed me. A woman with a stroller passed me. A child on a tricycle passed me. I was on a machine with wheels and a child on three wheels was faster than me because I was WALKING and the child was PEDALING and this is the fundamental flaw of the Treadmill Bike: it goes the speed of walking, which is slower than everything else with wheels. I was the slowest wheeled vehicle on the path and also the most confusing one."
Jess from Austin, TX — ★☆☆☆☆
"Every single person I passed did a double-take. Every. Single. One. Some pointed. One man stopped his dog, gestured at me, and said something to the dog. I don't know what he said to his dog about me, but his dog looked sympathetic. A teenager filmed me. I am probably on TikTok. I have not checked. I will never check. One star."
“Your walking motion turns the wheels”
Click to TweetBrian from Portland, OR — ★☆☆☆☆
"I could have walked. Without the machine. For free. At the same speed. I chose to add $500 of aluminum and rubber to the experience of walking. The machine does not make me faster. It does not make me more fit. It does not make me more efficient. It makes me slower, actually, because the belt has friction losses that ground contact doesn't. I am paying $500 to walk slower than free walking. I am subsidizing my own inefficiency. One star."
Karen from San Diego, CA — ★☆☆☆☆
"The machine weighs approximately 50 pounds. I have to carry it up and down the stairs of my apartment to use it. Carrying the Treadmill Bike to the starting point of my walk is a more intense workout than using the Treadmill Bike during my walk. The pre-workout is harder than the workout. If I just carried the machine around the block without using it, I'd burn more calories than I do walking on it. One star."
The Truth: An Engineering Solution in Search of a Problem That Doesn't Exist
The Treadmill Bike has been featured on numerous "worst inventions" lists, covered in disbelief by publications ranging from Wired to BuzzFeed, and demonstrated on YouTube in videos where the comments section is a unified symphony of "but... why?"
The physics are undeniable: a person walking on a treadmill belt that drives wheels moves at approximately the speed of walking, minus energy lost to friction, mechanical inefficiency, and the emotional toll of being photographed by strangers. The machine does not amplify human effort — it merely redirects it through a mechanical system that takes a percentage as tax. You walk. You lose some energy to the machine. You go slightly slower than if you'd just walked. The machine is a fitness tax on the act of fitness.
For people who genuinely enjoy the treadmill walking motion — the even surface, the consistent pace — a treadmill exists. In a gym. Indoors. Where nobody will film you. And for people who want to walk outside, outside exists. For free. Everywhere. The Treadmill Bike solves neither of these use cases better than the existing solutions and costs more than both.
A bicycle, for context, costs about the same or less, covers distance 3-5x faster, provides genuine cardiovascular challenge, and does not require you to walk on a belt in public. A pair of walking shoes costs $60 and provides the same workout as the Treadmill Bike without the machine, the weight, the storage, or the TikTok footage.
The Verdict
The Treadmill Bike is what happens when engineering serves no purpose — when someone builds a thing because they can, not because they should. It converts walking into walking. It makes easy things heavy. It makes simple things complicated. It makes private things public, specifically the private thing of looking foolish while exercising.
Walking is free. Walking is simple. Walking is the thing the Treadmill Bike does, minus the treadmill bike. The best version of the Treadmill Bike is no Treadmill Bike at all. Just walk. Just step outside and walk. Your feet know how. They've been doing this since you were one.
We rate it 1 out of 5 reasons to exist.
If you want to move through the world without attracting bewildered stares, see our alternatives below.
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✅What to Buy Instead
Walking Shoes
For walking outside. Just walk. That's the alternative. $60-120 for shoes that let you do what the Treadmill Bike does, without the treadmill bike.
Trek FX 1 Hybrid Bike
An actual bicycle that's faster than walking, provides real cardio, and doesn't look absurd. Covers distance. Burns calories. Has two wheels used correctly.
Nordic Walking Poles
If you want more intensity while walking, poles add upper-body engagement for $30. More workout, less machine, zero TikTok footage of strangers mocking you.
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