Scooter · 2021

S-Across

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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-Across 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-Across Tire Size, Oil & Service Capacities

🛞 Front Tire Size

2.75-14

Front wheel spec

🛞 Rear Tire Size

3.5-12

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 (Direct drive)

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 1200 mm (47.2 inches)

Wheels & Brakes

Front Tyre 2.75-14

Rear Tyre 3.5-12

Front Brakes Single disc

Rear Brakes Expanding brake (drum brake)

Dimensions & Weight

Dry Weight 135.0 kg (297.6 pounds)

Overall Height 1100 mm (43.3 inches)

Overall Length 1800 mm (70.9 inches)

Overall Width 720 mm (28.3 inches)

Service & Fluids

Brake Fluid DOT 4

Other

Starter Electric

Color Options Blue,Green

Instruments LED screen

Light Led front light

Notes

72V 20Ah lead-acid battery. Range 55km. Made in China.

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

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

✓ 5 Positive Owner Reviews (Pros)

Rugged crossover scooter styling with elevated ground clearance and protective body trim for rough urban pavement
High-torque brushless hub motor delivers dependable, silent hill-climbing power and smooth throttle transitions
Long-lasting battery chemistry delivers reliable 50-60 km real-world urban range per charge
Front hydraulic disc brake paired with wide tubeless tires provides solid traction and safe stopping performance
Flat, wide floorboard with sturdy front luggage hook makes carrying grocery bags and backpacks exceptionally easy

! 5 Negative Owner Reviews & Known Issues (Cons)

Maximum speed capped at 45 km/h limits utility exclusively to city streets and neighborhood speed zones
Rear drum brake provides modest stopping power and requires periodic manual cable adjustments
Under-seat storage volume is limited due to the battery placement, requiring an aftermarket top case for gear
Chassis build incorporates utilitarian plastics that lack the premium tactile feel of Japanese competitors
Suspension travel is modest and can bottom out under two full-sized adults riding over severe speed humps

★ Editor's Technical Verdict (2021)

The 2021 Yadea S-Across is a rugged, crossover-styled electric scooter engineered to handle the rough-and-tumble conditions of everyday urban commuting. With elevated ground clearance, durable bodywork, and a dependable brushless motor, it absorbs the potholed realities of city life while eliminating fuel costs entirely. Although limited by moped-class speed restrictions and utilitarian appointments, it is an accessible, eco-conscious transportation tool tailored for practical daily use.

🛡️ 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-Across →

Technical Overview

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

At the heart of the 2021 Yadea S-Across scooter motorcycle, Yadea 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-Across measures 135 kg (298 lbs) dry. Rider ergonomics and dimensional geometry center around a 1,200 mm (47.2 in) wheelbase engineered for quick, flickable turn-in geometry.

Chassis suspension hardware on the 2021 Yadea S-Across is configured for predictable road feedback with front suspension handled by Telescopic fork. Braking performance is delivered by single disc up front paired with expanding brake (drum brake) at the rear. Factory rolling stock mounts a 2.75-14 front tire and a 3.5-12 rear tire, sizing the contact patch for predictable turn-in grip and replacement tire availability.

Buyers cross-shopping the 2021 Yadea S-Across 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

2.75-14 / 3.5-12

About These 2021 Yadea S-Across Specifications & Data Sources: Technical data for the 2021 Yadea S-Across 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

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

S-Across 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-Across 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-Across 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

1,200 mm (47.2 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-Across 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-Across 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-Across Summary Table

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

### 2021 Yadea S-Across — 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-across/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-Across — 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-across/2021" style="color:#bf3b00;font-weight:600;text-decoration:none">2021 Yadea S-Across Specs, Review &amp; Recalls — MotoLibrary</a></div></div>

Running & Fuel Cost Estimate

S-Across 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-Across Frequently Asked Questions

Does the 2021 Yadea S-Across 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-Across?

The 2021 Yadea S-Across 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-Across 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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