What size e-bike is right for my height?

An e-bike can be technically perfect and still have unstable handling, cause sore knees, or simply never feel truly comfortable. This is often not due to the motor or battery, but to the frame size and overall geometry. If you buy the wrong size, you’ll spend months adjusting to the bike instead of the other way around.

Finding the right e-bike size is about more than just “I’m 1.78 m tall, so size M.” It’s also about your inseam, your riding position (upright or more sporty), the length of the top tube, and the adjustment of the handlebars and saddle. With a few measurements and a short checklist, you can get close to a size that’s actually right for you.

What exactly does ‘size’ mean when it comes to an e-bike?

For many city and touring e-bikes, “size” refers to the frame size in centimeters (for example, 50, 55, 60) or in S/M/L. Sometimes you’ll see inches, especially on sportier models. It remains confusing, because not all brands measure the same way.

Important: Frame size isn't the whole story. Two bikes labeled “size 55” can feel completely different due to differences in geometry, wheel size, stem length, and bottom bracket position.

Key Concepts in Plain Language

• Frame size: usually the length of the seat tube (from the bottom bracket to the seat tube clamp), or an approximation of that.
• Reach: how far forward you reach toward the handlebars. This determines whether you're sitting in an ‘extended’ position.
• Stack: the height of the front frame. Determines how upright you can sit without having to do anything unusual.
• Standover height: the height of the top tube. Good to know when getting on and off the bike.

Step 1: Measure your inseam (this is often a more important factor than your height)

Your total height is a rough guide. Your inseam is often a more accurate measure, since it directly affects saddle height and frame height. Two people who are both 1.80 m tall can have very different inseam lengths and therefore different ideal sizes.

Here's how to measure your inseam

• Take off your shoes and stand with your back against a wall.
• Clamp a book firmly against your crotch (as a saddle would sit).
• Measure from the top of the book to the floor in centimeters.

Write down this number. This is your inseam.

Guide: Which frame size is right for your height?

The table below is intended as a starting point. It will help you narrow down your search to the right size range, after which you can make your final decision by test-riding and adjusting the bike. For many city-style (upright) e-bikes, the size is often slightly roomier than for sportier bikes.

Use this table to quickly select the appropriate frame size range based on your height.

Please note: for some brands, 56 is considered “sporty long,” while for others it’s “compact.” That’s why the next step is just as important.

Step 2: Choose your seating position (upright or leaning forward)

The “right size” also depends on how you want to sit. A city bike with a high stack and shorter reach feels very different from a sporty e-bike with a low front end, even if they’re the same size. If you mainly ride comfortably around town, you’ll usually want a stable, slightly more upright riding position.

When is a smaller size a better fit?

• You want to be able to stop easily and get off quickly in heavy traffic.
• You like a short, agile bike.
• You have relatively short arms or a short torso.
• You're torn between two sizes, and you prefer a snug fit over a loose one.

When is a larger size a better fit?

• You're taking longer rides and want a comfortable riding position.
• You have relatively long arms or a long torso.
• You like a bike that feels stable at higher speeds.

Step 3: Look for 5 signs that the size isn't right

When you're test-riding, don't just focus on the motor assistance and brakes. Your body often gives you clues within ten minutes. The signs listed below are typical indications that the frame size or the bike's setup isn't right.

Too small: Does this sound familiar?

• Your knees come up high and almost touch the handlebars.
• You're “hunched over” and feel a lot of pressure on your hands.
• The bike handles nervously, especially when riding with one hand.
• You're having trouble raising your saddle high enough without it feeling awkward.

Too big: Does this sound familiar?

• You reach far toward the steering wheel, and your shoulders hunch up.
• Your lower back tends to get tense quickly.
• Stopping feels unsafe because you can't get your feet firmly on the ground.
• You steer “slowly” around corners, as if you have to convince the bike first.

What about low-entry, high-entry, and ‘one size’?

Many e-bikes have a low step-through frame, which is great for city riding and when you make a lot of stops. That doesn’t change the importance of the size, but it does change how you mount the bike and how the top tube height feels. With a low step-through frame, you can sometimes have a little more wiggle room without it becoming unsafe.

With ‘one-size’ models, the size selection often involves a wider range of adjustment for the saddle and handlebars. That sometimes works just fine, but you’ll want to pay extra close attention to the reach and handlebar height. A reach that’s too long can’t always be fixed by simply “lowering the saddle a bit.”.

Adjustments: You can make a lot of improvements (but not everything) by adjusting the saddle and handlebars

Proper adjustment can turn a nearly-perfect fit into a truly comfortable one. It doesn't work the other way around: you'll rarely be able to get a frame that's clearly too big or too small to fit right, no matter how much you adjust the seatpost.

Quick Adjustment Guidelines for Comfort

• Saddle height: When the pedal is in the lowest position, your knee should be slightly bent, not straight.
• Saddle Position: If you lean too far forward, you'll quickly get knee pain; if you lean too far back, it often puts a lot of strain on your hamstrings.
• Handlebar height: Higher handlebars provide a more upright riding position and put less strain on your wrists; lower handlebars offer a sportier ride.
• Steering travel: If you're always “hanging” from your arms, you're probably standing too far from the handlebars or your seat is set too low.

What if you're between two sizes?

This is perfectly normal. In that case, it’s a good idea to prioritize your main use: city riding with lots of stops requires control and the ability to get off easily, while commuting at a steady pace calls for smoothness and stability.

When in doubt, many people opt for the smaller size and adjust for it with saddle height and, if necessary, a stem. That often feels safer in the city. Those who go on long rides and want a comfortable, “long-distance” bike are sometimes better off with the larger size.

Practical Choices: Which Type of STOER E-Bike Is Right for Your Body Type?

At STOER Bikes, the focus is primarily on city use and daily rides. In these situations, stability, control, and a comfortable riding position are often more important than an aggressive, sporty riding position. So when you’re looking for a city bike, you can base your choice of size on the character you want your bike to have.

• If you're looking for a nimble e-bike for everyday commuting, a city bike like the CityX e-bike for a comfortable commute often works well with a slightly more upright sitting position.
• If you're looking for a modern city e-bike with a smoother ride, check out the UrbanX e-bike for city riding and longer rides and pay special attention to reach and handlebar adjustment.

Common Mistakes When Choosing the Right E-Bike Size

Most bad purchases aren't caused by an incorrect table, but by assumptions. These are mistakes you can easily avoid.

• Buy by length only and ignore your inseam length.
• Test Riding with a Saddle That's Too Low, which makes the bike seem “too small” and puts excessive strain on your knees.
• Forgetting that e-bikes are heavier: If it's too big, it feels even more awkward when stopping and turning.
• Do not include clothing and shoes: A winter coat, rain gear, and sturdy shoes can slightly change your posture.

A helpful extra check: What do independent sizing guidelines say?

If you're still unsure, it might help to compare your measurements to general guidelines on frame sizes and bike geometry. Wikipedia, for example, explains how frame size is traditionally measured and why measurement systems can vary by bike type.

Read more about frame sizes and bike frame measurement If you want to understand why “size 55” doesn’t always mean the same thing.

A quick checklist for in the store or during a test drive

• Did I measure and record my inseam?
• Is the saddle set at a realistic height during the test ride?
• Can I steer comfortably without putting strain on my wrists and shoulders?
• Does stopping and getting off feel like second nature?
• Is this bike right for my rides: short trips around town or longer distances?

The final step: confirm your choice with a test drive

The best fit feels relaxed, predictable, and comfortable, without you having to “work hard” on your posture. Once you have a good basic fit, you can use adjustments to fine-tune it just a bit more.

Would you like to compare different sizes and seating positions side by side? Then check out the overview of all STOER e-bikes and schedule a test ride at a dealership so you can be sure the size is right for your body and daily use.