The Best Exercise Bikes for Bad Knees

We went looking for 60 measurements across the 6machines on this page — the nine that decide whether an older adult can get on, reach the controls, read the screen and hear themselves think. 33 of those 60 are not published by anybody. Not one manufacturer here publishes the full set.

Step-over height is the worst of them. It is the single measurement that decides whether you can get onto a machine at all, and across everything we checked, not one manufacturer states it. That is not an oversight in a category explicitly marketed to seniors, and the count in each panel above is there so you can see who is doing it.

Where a figure exists, we cite it and date it. Where it doesn’t, the panel says Not published by the manufacturer rather than an estimate dressed up as a fact. You can measure step-over height yourself in about a minute — and if a machine is already in your house, that is the fastest way to settle it.

Most machines publish a level count and nothing else, which is close to meaningless: eight levels on one bike and eight on another may span entirely different ranges. Two machines here do better.

The Horizon 5.0Rpublishes 0–100 electronically controlled resistance. A hundred steps means the increment between adjacent settings is small enough that you can find the exact load a knee will tolerate rather than choosing between too little and too much. This is the single most relevant published specification on this page.

The Teeter FreeSteppublishes its 20 levels as a range in pounds: 0 to 105 lb. That is a genuinely useful number because it is absolute rather than relative — you know what level 1 actually is.

Everyone else publishes a count. The Schwinn’s 25 magnetic levels are the best of those, because more levels across a similar range means smaller steps. Sixteen levels, as on the HARISON and Niceday, is the middle. Eight levels on a mechanical knob is coarse for this purpose, and it is what most budget bikes have.

This is more important than anything you buy. At the far point of the pedal stroke your knee should keep a slight bend. If the seat is too far back you straighten and over-extend on every single revolution — hundreds of times a session — and a knee that was fine at minute two will not be at minute fifteen. Too close and you close the joint angle up and load the front of the knee instead.

So look for a continuously adjustable seat rail rather than fixed positions. The HARISON publishes a one-hand sliding rail with a 26.5 to 38.9 inch range. The Niceday, by contrast, has eight fixed positions — which means your correct seat distance has to fall near one of eight holes, and if it falls between two you get to choose which way to be slightly wrong.

Set it, then ride two minutes and check again. Nearly everyone sets it too far back the first time.

The CDC’s target for adults 65 and over is at least 150 minutes a week of moderate activity. With a bad knee, that is a destination measured in months rather than weeks, and the fastest route to it is a slower start than feels reasonable.

Ten minutes at the lowest resistance, three times in the first week. If the knee is no worse the next morning — the next morning is the test, not during the ride — add five minutes. The Arthritis Foundation’s guidance on building volume is worth reading alongside this, and the pattern it describes is the same: increase one variable at a time and never duration and resistance together.

The fuller version of that build-up is here, and the guide on whether a recumbent bike is good for knees covers the mechanism.

If the lowest setting on a bike is still too much, more bike is not the answer. Two honest alternatives:

A pedal exerciser at one-tenth the price, one of which offers steplessresistance — a continuous dial, so you can set something genuinely tiny. And a motorized seated elliptical, which moves your legs through the stride whether you push or not. That is passive movement rather than exercise, and we are clear about the difference, but it keeps a joint moving on a bad day.

And if the knee is post-surgical, recently injured, or has changed suddenly, the right first step is a physical therapist rather than a purchase. They will tell you the range and load your knee should be working in, which is information no specification sheet contains.