16, 20 or 24 Inch Folding Bike: How Wheel Size Changes the Ride

Wheel size is the single biggest decision when choosing a folding bike. It shapes how the bike handles, how far it folds, and whether it fits your daily routine. The three most common sizes—16, 20, and 24 inches—each sit at a different point between maximum portability and full-size ride feel.

Quick Takeaways

Which Wheel Size Is Right for You?

The answer depends on three factors: how often you fold and carry the bike, what kind of roads you ride on, and how far you go.

If you take the bike on trains or buses regularly, or carry it up stairs, the folded size and weight matter most. A 16-inch bike gives you the smallest package. A 20-inch bike gives you a balance between a compact fold and a more comfortable ride. A 24-inch bike trades portability for a ride that feels closest to a standard bicycle, but the folded size puts it out of reach for most multi-modal commuters.

For most urban riders in Germany, the 20-inch folding bike hits the practical midpoint. It folds small enough for the luggage rack (Gepäckablage) on a DB train, fits in most car boots, and handles city streets with enough stability for daily use.

How Does Wheel Size Change the Ride?

Three physical factors connect wheel diameter to what you feel on the road.

Roll-Over Ability

A larger wheel rolls over obstacles at a shallower angle. A 24-inch wheel meets a pothole or tram rail at roughly 15 degrees. A 16-inch wheel hits the same obstacle at around 22 degrees. The steeper angle transmits more of the impact to the rider. This is simple geometry, not just tyre pressure, which is why smaller-wheeled bikes feel bumpier on rough surfaces.

Stability at Speed

Larger wheels create a stronger gyroscopic effect, which stabilises the bike at higher speeds. A 20-inch bike at 25 km/h feels noticeably steadier than a 16-inch bike at the same speed. The difference is most noticeable on fast descents or in strong crosswinds.

Acceleration

Smaller wheels have less rotational mass, which means they spin up faster from a standstill. A 16-inch bike accelerates more quickly from traffic lights, providing a clear advantage in stop-and-go city riding. The energy cost of getting back up to speed is lower, which matters significantly if your route has many intersections.

What Are 16-Inch Folding Bikes Good For?

A 16-inch folding bike is built around one priority: the smallest possible package.

Folded size: Typically 60–80 × 30–40 × 60–70 cm; the most compact of the three sizes.

Weight: Generally 9–12 kg; the lightest category.

Ride: More sensitive to road surfaces. Cobblestones, tram tracks, and potholes are all felt more clearly than on a larger wheel. On smooth tarmac, the difference is minor.

Speed: Higher cadence required for the same road speed, but acceleration from stops is quicker.

Who It Suits

• Commuters who carry the bike on the train every day and need the smallest fold.
• Riders who live in a flat with very limited storage.
• Anyone combining bike legs of under 5–8 km with public transport.

What to Watch For

• Tyre availability is more limited than for 20-inch models.
• Requires a slightly higher cadence on longer stretches.
• Road vibration is more noticeable on poor surfaces.

The DAHON Boardwalk D7 (16-inch) is a current prime example: featuring a Chromoly frame, 7-speed Shimano gearing, a folded size of 77 × 30 × 63 cm, and weighing 11.54 kg.

What Are 20-Inch Folding Bikes Good For?

The 20-inch folding bike is the most widely sold format on the market. It beautifully balances portability with a ride quality that works for longer daily distances.

Folded size: Typically 63–85 × 30–35 × 65–82 cm; larger than the 16-inch but still compact enough for train travel as hand luggage on Deutsche Bahn.

Weight: Generally 11–14 kg.

Ride: Noticeably more stable than 16-inch bikes on mixed surfaces. Tram tracks, wet cobblestones, and urban potholes—common on many German city routes—are absorbed more predictably.

Speed: Lower cadence required than 16-inch for the same speed. Comfortable for commutes of 10–20 km.

Who It Suits

• Daily commuters with a mix of cycling and public transport.
• Riders covering 10–20 km per day on varied urban roads.
• Anyone who wants a single bike that covers both the daily commute and occasional longer rides.

DAHON's 20-Inch Range

DAHON's current lineup for the German market centres on 20-inch models. The Boardwalk D7 20" offers a classic Chromoly frame with 7-speed Shimano gearing and a folded size of 63 × 30 × 77 cm. The HIT D6 and Dream D6 are aluminium-frame options at different price points. The Mariner D8 adds rust-resistant components and 8-speed Shimano gearing, making it well-suited to year-round riding in wet conditions. All fold in three steps and travel free on DB trains as hand luggage.

What Are 24-Inch Folding Bikes Good For?

A 24-inch folding bike delivers a ride that feels close to a standard city bike. The larger wheel rolls over road imperfections smoothly, holds speed well, and feels stable at higher cadences.

The trade-off is portability. A 24-inch folded bike typically measures 95–115 × 35–45 × 80–95 cm and weighs 13–17 kg. That puts it outside the practical range for most train travel and overhead luggage racks.

Where It Works

• Riders who primarily transport the bike by car rather than public transport.
• Longer leisure rides where comfort matters more than compactness.
• Riders transitioning from a standard bike who want the most familiar ride feel.

Where It Does Not Work

• Multi-modal commuting: The folded package is too large for most overhead racks and luggage areas on DB trains.
• Small flats: The folded footprint is similar to a standard bike leaned against a wall.
• Frequent carrying: At 13–17 kg folded, it is heavy to lift up stairs or carry through a station.

A practical note: If you plan to use the bike on Deutsche Bahn regularly, a 24-inch model creates uncertainty. DB allows folded bikes as free hand luggage with no stated size limit, but the bike must fit in available storage spaces. A 24-inch folded bike often does not fit in overhead racks and can block passageways in multi-purpose zones. For reliable, unrestricted train travel, 20 inches is the practical upper limit.

How Do the Three Sizes Compare on Folded Size and Weight?

The jump from 20 to 24 inches is larger than the jump from 16 to 20. A 24-inch folded bike takes up roughly twice the floor space of a 16-inch model.

Does Wheel Size Determine Speed?

Not directly. Speed depends on gearing, cadence, and rider effort, not wheel diameter alone.

A 16-inch wheel with a 52-tooth chainring and a 7-speed cassette can reach the same road speed as a 20-inch wheel with equivalent gearing. The difference is cadence: the 16-inch wheel needs more rotations per minute to cover the same ground. At cruising speeds of 20–25 km/h, most riders find 20-inch gearing more comfortable for sustained effort.

Larger wheels do have lower rolling resistance on smooth, flat surfaces. On the patchy tarmac and cobblestone sections found on many German city routes, tyre width and pressure matter more than wheel diameter.

What Actually Determines Cruising Speed

• Number of gears and gear range.
• Tyre width and pressure.
• Rider fitness and cadence.
• Wind resistance: Smaller, lighter bikes have a marginal advantage here.

A well-geared 20-inch folding bike is faster in practice than a poorly geared 24-inch model. Focus on the gear range, not the wheel size, when evaluating speed.

How to Pick a Wheel Size for Your Commute

Work through these four questions in order:

1. Do you use public transport regularly?
If yes: 16 or 20 inches. A 24-inch bike will create problems on trains and buses.

2. How far do you ride per day?

• Under 8 km: 16-inch works well, especially if the route is mostly smooth.
• 8–20 km: 20-inch is more comfortable, demands a lower cadence, and is better on mixed surfaces.
• Over 20 km: 20-inch with good gearing, or consider a non-folding bike for that distance.

3. How much do you carry the bike?

• Carry it daily up stairs, onto trains, into lifts: Lighter is better, and the 16-inch has the edge.
• Mostly roll it or store it: 20-inch is perfectly fine.

4. What are your roads like?

• Smooth tarmac: 16-inch works without compromise.
• Cobblestones, tram tracks, potholes: 20-inch absorbs these more predictably.

For most urban commuters in Germany, the answers point to the 20-inch model. It handles the DB commute, fits in the car, stores easily in a flat, and rides comfortably over the road surfaces found in most German cities.

Fold Smarter, Ride Further

Wheel size is a practical decision, not an aesthetic one. Get it right, and the bike fits into your routine without effort. It goes with you on the train, stands securely in the corner of the office, and rolls out again whenever you need it. DAHON's 20-inch range is built around exactly that kind of everyday use. Find the model that fits your route in the full DAHON range.

FAQs About Folding Bike Wheel Sizes

Q1: Which Wheel Size Is Best for a Folding Bike?

It depends on how you use the bike. For multi-modal commuting with regular train travel, a 20-inch is the most practical choice: compact enough for DB hand luggage rules and stable enough for daily urban riding. For maximum portability and the smallest fold, 16-inch is better. For comfort on longer rides where train portability is not needed, a 24-inch model comes closest to a standard bike feel.

Q2: Are 16-Inch Folding Bikes Harder to Ride?

Not harder, but different. The steering responds more quickly, and road vibration from cobblestones or potholes is more noticeable. Most riders adapt within a few outings. On smooth urban roads under 10 km, a 16-inch bike is entirely practical. For longer distances or rougher surfaces, the extra stability of a 20-inch wheel becomes apparent.

Q3: Are Bigger Wheels Faster on a Folding Bike?

Not automatically. Road speed depends on gearing and cadence more than wheel diameter. A 20-inch bike with a wide gear range can cruise faster than a 24-inch bike with limited gearing. Larger wheels have lower rolling resistance on smooth surfaces, but on patchy tarmac and cobblestones—common in German cities—tyre pressure and width matter more. Check the gear range, not just the wheel size.

Q4: Can Tall Riders Use a 20-Inch Folding Bike?

Yes. Most 20-inch folding bikes accommodate riders from around 150 cm to 195 cm through adjustable seatpost and handlepost heights. DAHON's 20-inch models include an extended seatpost that covers a wide range of rider heights. If you are above 190 cm, verify the maximum seatpost extension for the specific model before buying.