Scooter · 2021

S-Force

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MotoLibrary Score

30 /100 Commuter

Top Speed

60 km/h

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Performance & Handling Profile Balanced Streetfighter / All-Rounder

S-Force Performance & Handling Ratings

Power

55/100

Standard

Torque

55/100

Balanced

Agility

89/100

135 kg dry

Ergonomics

68/100

Standard

Range

58/100

Standard

Tires, Oil & Maintenance Specs 2021 Factory Reference

S-Force Tire Size, Oil & Service Capacities

🛞 Front Tire Size

90/90-12

Front wheel spec

🛞 Rear Tire Size

110/70-12

Rear wheel spec

📏 Seat Height & Mass

135.0 kg (297.6 pounds)

Dry weight: 135.0 kg (297.6 pounds)

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Engine

Engine Type Electric

Fuel System Electronic motor controller (Direct electric drive)

Ignition Electronic controller

Cooling Air

Transmission

Gearbox Automatic

Clutch Direct electric drive (clutchless)

Driveline Belt / Chain final drive

Performance

Top Speed 60.0 km/h (37.3 mph)

Greenhouse Gases 0.0 CO2 g/km. (CO2 - Carbon dioxide emission)

Chassis

Front Suspension Telescopic fork

Wheelbase 1280 mm (50.4 inches)

Wheels & Brakes

Front Tyre 90/90-12

Rear Tyre 110/70-12

Front Brakes Single disc

Rear Brakes Single disc

Dimensions & Weight

Dry Weight 135.0 kg (297.6 pounds)

Overall Height 1150 mm (45.3 inches)

Overall Length 1860 mm (73.2 inches)

Overall Width 720 mm (28.3 inches)

Service & Fluids

Brake Fluid DOT 4

Other

Starter Electric

Color Options Red, White, Black

Instruments LED screen

Light Led front light

Notes

60V 40Ah lithium battery. Range 100 km. Made in China.

Owner Reviews, Editor Verdict & Safety Recalls Verified 2021 owner feedback, NHTSA/DVSA recall records & editorial review

2021 Yadea S-Force Pros, Cons, Recalls & Verdict

✓ 5 Positive Owner Reviews (Pros)

High-output electric hub motor provides brisk off-the-line torque, beating typical 50cc scooters away from traffic lights
Advanced graphene battery pack provides rapid recharge capability, extended life cycles, and superior cold-temperature tolerance
Aggressive aerodynamic body styling with dual LED projector headlights gives it a bold, high-tech sport scooter presence
Dual hydraulic disc brakes front and rear deliver strong, confidence-inspiring deceleration in emergency city stops
Spacious ergonomic seating with passenger footpegs and rear grab handles accommodates two riders comfortably

! 5 Negative Owner Reviews & Known Issues (Cons)

Top speed remains restricted to 45 km/h in moped trim, requiring patience on wide suburban avenues
Heavier curb weight when equipped with graphene/lead-acid packs compared to pure lithium-ion competitors
Under-seat storage space is compromised by the large onboard battery enclosure, fitting only half-helmets
Suspension damping feels stiffly sprung over sudden potholes and rough expansion joints
Digital speedometer display can suffer from glare under direct sunlight at specific midday viewing angles

★ Editor's Technical Verdict (2021)

The 2021 Yadea S-Force is a sport-styled electric scooter that combines aggressive, dynamic lines with durable high-output electric powertrain technology. Featuring quick throttle response, dual disc brakes, and rugged battery engineering, it bridges the gap between utilitarian commuter and spirited urban runabout. While its speed remains electronically capped for moped licensing compliance, it provides budget-minded commuters with a sharp-looking, zero-emission urban vehicle that costs pennies to run.

🛡️ Official Safety Recalls (2021) 0 Official Recalls

No official safety recalls reported for this model year.

🛡️ Open Full Recall & Chronic Fault Lookup → 📋 Generate Printable Pre-Purchase Checklist for 2021 S-Force →

Technical Overview

2021 Yadea S-Force Technical Analysis, Chassis Review & Ownership Overview

Positioned in Yadea's scooter motorcycle lineup, the 2021 Yadea S-Force features a purpose-built air-cooled electric configuration. Internal cylinder geometry specifies fuel delivery managed via electronic motor controller (direct electric drive).

On the scales, the S-Force measures 135 kg (298 lbs) dry. Rider ergonomics and dimensional geometry center around a 1,280 mm (50.4 in) wheelbase engineered for quick, flickable turn-in geometry.

Chassis suspension hardware on the 2021 Yadea S-Force is configured for predictable road feedback with front suspension handled by Telescopic fork. Braking performance is delivered by single disc up front paired with single disc at the rear. Factory rolling stock mounts a 90/90-12 front tire and a 110/70-12 rear tire, sizing the contact patch for predictable turn-in grip and replacement tire availability.

Buyers cross-shopping the 2021 Yadea S-Force in the Scooter segment most frequently benchmark its horsepower, seat height, and curb weight against the Yamaha NMAX (2018), Yamaha Sight (2018), Yamaha TMAX (2018).

Tire Combination

90/90-12 / 110/70-12

About These 2021 Yadea S-Force Specifications & Data Sources: Technical data for the 2021 Yadea S-Force is compiled from manufacturer OEM service sheets and type-approval records by the MotoLibrary Editorial Team. Performance ratings, seat-height ergonomics, A1/A2 license eligibility, gearing speeds, and ownership cost estimates are calculated across MotoLibrary's database of 43,881+ motorcycles using power-to-weight (HP/kg) ratios and factory chassis dimensions.

✓ Verified against OEM service manuals & type-approval records

Editorial Methodology Report a Spec Correction →

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Before You Compare This Bike

Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.

Weight

Compare weight carefully because it affects low-speed handling, parking and confidence.

Brakes

Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.

Suspension

Suspension details can matter for comfort, road feel and long-distance riding.

Transmission

Transmission and final drive affect maintenance, smoothness and everyday usability.

Rider Profile

Who Is This Bike For?

🏙️

Best For

City & Commuting

⚖️

Handling

Manageable weight for most riders

Find similar bikes for your profile →

Seat Height & Ergonomics Seat: 800 mm (31.5 in)

S-Force Seat Height & Rider Height Fit

Rider Height 175 cm (5'9")

Leg Inseam 79 cm (31.1")

Footwear Sole:

🟢 Balls of Both Feet (Secure)

Est. Knee Angle: ~92°

Quick Height Reference (800 mm Saddle + 28 mm Seat Width Arc):

163cm (5'4")

1-Foot Only

170cm (5'7")

Balls of Feet

178cm (5'10")

Balls of Feet

185cm (6'1")

Flat-Foot

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License & Power Limit Check Full A License (Unrestricted)

S-Force A1, A2 & LAMS License Compatibility

Exceeds A1/A2 learner limits (>70 kW or >0.20 kW/kg). Requires an unrestricted Category A motorcycle license.

Output (kW / HP)

N/A

Power / Weight

Standard

LAMS Ratio

N/A

🇪🇺 EU/UK A1 (≤11kW) ✗ No

🇪🇺 EU/UK A2 (≤35kW) ✗ Full A Only

🇦🇺 AU/NZ LAMS (≤150kW/t) ✗ Exceeds

🌍 Unrestricted Class A ✓ All Riders

* EU Directive 2006/126/EC requires ≤35 kW (47.5 HP), ≤0.20 kW/kg wet weight, and a factory base model not exceeding 70 kW (95 HP) for A2 restriction. Always verify VIN homologation on your registration certificate.

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Engine Design & Chassis Dimensions OEM Specs

S-Force Engine Stroke, RPM & Steering Geometry

Mean Piston Speed (@ 8,500 RPM)

Standard Street Velocity

Standard Factory Thermal Load

Bore × Stroke Architecture

OEM Spec

Balanced Street Engine Architecture

Steering Rake & Trail

Standard Rake

Neutral Balanced Cornering & Highway Composure

Wheelbase & Stability

1,280 mm (50.4 in)

Compact agile chassis footprint

Engine Note: Mean piston speed (v_m = 2 × Stroke × RPM / 60) measures piston travel velocity at peak power. Values under 18.5 m/s indicate low inertial stress on connecting rods and rings; values above 21.5 m/s approach Formula 1 / MotoGP velocities.

Sprockets, Chain & Cruising RPM Base: 16T / 43T (2.69:1) · Class Ref

S-Force Sprocket Ratio, RPM & Top Speed

Front Sprocket 16T (0)

Rear Sprocket 43T (0)

Final Ratio

2.69:1

0.0% (Factory Stock)

100 / 120 km/h RPM

Top gear est.

Geared V-Max

~60 km/h

Rule of Thumb: Dropping 1 tooth in the front (-1T) equals roughly adding +2.7 to +3 teeth on the rear sprocket, boosting wheel torque by ~6–7% at the cost of higher highway cruising RPM.

⚙️ Tire Size & Speedo Error Calc → 🏁 Loaded Rider HP/kg & Drag Calc →

Tire Pressure & Suspension Travel Travel: 125mm F / 130mm R

S-Force Tire Pressure (PSI / Bar) & Suspension Sag

1. Riding Setup Mode:

2. Payload / Passenger Load:

Target Rider Sag (F / R)

38 mm Front · 39 mm Rear

Free (Static) Sag target: 10–15 mm

Cold Tire Pressure (F / R)

32 / 36 PSI

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2021 Yadea S-Force Summary Table

Writing a review, forum post, or blog article on the 2021 Yadea S-Force? Copy a Markdown table or embeddable HTML spec card:

### 2021 Yadea S-Force — Key Specs & Telemetry
| Parameter | Specification |
| :--- | :--- |
| **Category** | Scooter |
| **Displacement** | N/A |
| **Power Output** | N/A |
| **Torque** | N/A |
| **Seat Height** | 800 mm |
| **Weight (Dry / Wet)** | 135.0 kg (297.6 pounds) / 143.1 kg |
| **Mean Piston Speed** | Standard |
| **EU A2 License Status** | Full A License (Unrestricted) |
| **Source & Full Telemetry** | https://motolibrary.com/bikes/yadea/s-force/2021 |

<div style="font-family:system-ui,-apple-system,sans-serif;border:1px solid #e2dfd8;border-radius:12px;padding:14px 16px;max-width:560px;background:#ffffff;color:#1a1a1a"><div style="font-weight:700;font-size:16px;margin-bottom:8px">2021 Yadea S-Force — Technical Specs &amp; Recall Summary</div><table style="width:100%;border-collapse:collapse;font-size:13px"><tr><td style="padding:5px 0;border-bottom:1px solid #eee;color:#666">Engine / Power</td><td style="padding:5px 0;border-bottom:1px solid #eee;font-weight:600;text-align:right">N/A · N/A</td></tr><tr><td style="padding:5px 0;border-bottom:1px solid #eee;color:#666">Seat Height</td><td style="padding:5px 0;border-bottom:1px solid #eee;font-weight:600;text-align:right">800 mm</td></tr><tr><td style="padding:5px 0;border-bottom:1px solid #eee;color:#666">Weight (Dry / Wet)</td><td style="padding:5px 0;border-bottom:1px solid #eee;font-weight:600;text-align:right">135.0 kg (297.6 pounds) / 143.1 kg</td></tr><tr><td style="padding:5px 0;border-bottom:1px solid #eee;color:#666">License / Recall Audit</td><td style="padding:5px 0;border-bottom:1px solid #eee;font-weight:600;text-align:right">Full A License (Unrestricted) · 0 official safety recalls recorded</td></tr></table><div style="margin-top:8px;font-size:12px;color:#666">Data source: <a href="https://motolibrary.com/bikes/yadea/s-force/2021" style="color:#bf3b00;font-weight:600;text-decoration:none">2021 Yadea S-Force Specs, Review &amp; Recalls — MotoLibrary</a></div></div>

Running & Fuel Cost Estimate

S-Force Annual Fuel, Maintenance & Ownership Cost

Annual km

Fuel Price ($/L)

Fuel Consumption (L/100km) — estimated

⛽ Fuel

per year

🔧 Maintenance

per year

🛡️ Insurance

per year

TOTAL

* Estimates only. Actual costs vary by country, riding habits, insurance provider and maintenance schedule.

Quick Buyer Answers

2021 Yadea S-Force Frequently Asked Questions

Does the 2021 Yadea S-Force have any official safety recalls?

No official safety recalls reported for this model year.

What is the seat height and weight of the 2021 Yadea S-Force?

The 2021 Yadea S-Force has a seat height of 800 mm, a dry weight of 135.0 kg (297.6 pounds), and a wet/curb weight of 143.1 kg (estimated).

Is the 2021 Yadea S-Force EU A2 or LAMS license legal?

License classification: Full A License (Unrestricted). Exceeds A1/A2 learner limits (>70 kW or >0.20 kW/kg). Requires an unrestricted Category A motorcycle license.

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