Will an under-desk bike fit under your desk?

Seated under-desk machines have one hard constraint, and it is vertical. Your knee rises through the top of the pedal stroke. If the underside of your desk is lower than that path, the machine does not work — not “works less comfortably”, does not work.

Everything else in this category is a preference. Sixteen resistance levels versus eight is a preference. App tracking is a preference. A display is a preference. Clearance is arithmetic, and getting it wrong means a box going back.

Which is what makes it striking how few makers publish the number. This is a product category whose entire selling proposition is “it fits under your desk”, and half the machines we checked will not tell you how tall they are.

Five minutes with a tape measure and you can answer this yourself, which is better than any product page will manage for you.

1. Floor to the underside of your desk.Not the desktop surface — the lowest thing under it. Many desks have an apron rail or a shallow drawer that eats two or three inches, and that is the number that governs. A standard 29 to 30 inch desk typically leaves 27 to 28 inches underneath, but yours may be less.
2. Your seated knee height. Sit in the chair you actually use, at the height you actually use it, feet flat. Measure floor to the top of your knee. This is where the machine has to fitunder your leg, and it varies far more between people than desk heights do.
3. The depth available.These machines reach further back than they look — 20 to 23 inches deep on the ones that publish it. Measure from the front edge of the desk to whatever is behind (a wall, a cable tray, a CPU tower).
4. The width available. The DeskCycle is 24 inches wide, which is genuinely wide. Check that against your chair base and the desk legs.

The arithmetic that follows: your seated knee height, minus the machine’s pedal height, has to leave enough that your knee does not hit the desk when the pedal is at the top. There is no published formula for that from any manufacturer we found, which is why the DeskCycle guidance below is unusually valuable.

Two of four publish a pedal height. One of four publishes a user weight limit — and that one, the Cubii JR1, publishes 150 lb, which is the lowest limit of any machine on this site and rules it out for a large share of buyers before clearance even comes into it.

Where a machine publishes nothing, we are not going to estimate it from a photograph. If you are considering one of those, the practical move is to ask the seller for the height in writing before ordering.

Three real options, in order of how much they cost you.

1. Raise the chair, not the desk. If your chair goes up and your feet still reach the pedals, you gain clearance for free. The catch is that your arms then sit too low for the desk, so this only works over an inch or two.

2. Take the elliptical rather than the circular stroke. An under-desk elliptical flattens the knee’s path through the top of the motion, so for the same machine height it needs less vertical room. That is the genuine argument for that design — not any claim about calorie burn.

3. Get a taller desk, and then reconsider the machine. If you are going to buy a height-adjustable desk anyway, the calculation changes entirely: with an adjustable desk, a walking pad becomes viable, and walking recruits substantially more of you than seated pedaling does. The comparison.