⬇️ Download the EKX X21 MAX User Manual (PDF)

Quick Specifications: EKX X21 MAX #

How the X21 MAX Differs Within the EKX Series #

All EKX models (GTS, X21, X21 MAX, X20) share the same manual framework, frame architecture, LCD instrumentation, removable battery system, and fault-code diagnostics. The X21 MAX is distinguished by:

• Motor: 3000W rated output, a 50% power increase over the standard X21 and X20 (2000W).
• Battery: 60V 30Ah pack, higher voltage than the 48V platform used on the X21 and X20.
• Wheel: 70/100-19 motocross-style wheel for off-road terrain, versus the 20×4.0 fat tire on the X21 and X20.
• Range: 150 km riding distance with a 150 kg maximum load.

Charging, controller, and display behavior follow the universal EKX series protocol — the same LCD unit, gear buttons, PAS modes, and fault codes are used across the series.

Part 1 — Before You Ride: Safety Requirements #

Essential Safety Warnings #

• Read this manual completely before riding your EKX X21 MAX for the first time, and keep it for future reference.
• Retain the original packaging for repackaging in case of return or product replacement.
• Follow the assembly instructions precisely and verify that no screws are loose before every ride.
• Wear a certified helmet and comply with all local traffic regulations.
• Do not modify safety-related devices without qualified authorization; retain your purchase receipt to establish warranty responsibility.

Pre-Ride Mechanical Safety Checklist #

• Wheels & Tires: Verify correct tire pressure; inspect tread and casing for wear or embedded objects.
• Brakes: Confirm both front and rear brakes engage effectively; replace worn brake blocks and center the calipers as needed.
• Steering: Handlebar and stem must be correctly adjusted and tightened; verify headset locking mechanism.
• Chain: Chain must be oiled, clean, and run smoothly — extra care is required in wet or dusty conditions.
• Battery Pack: Ensure the battery is in good operating condition and kept fully charged.
• Bearings: All bearings (headset, wheel, pedal, bottom bracket) must be lubricated and free of grinding or rattling.
• Cranks & Pedals: Pedals securely tightened to cranks; cranks secure to the axle and not bent.
• Frame & Fork: Inspect for bends or cracks; replace damaged frame or fork components immediately.
• Motor Drive & Throttle: Confirm all motor drive components are correctly mounted and functioning.

Part 2 — Battery Care and Charging (60V 30Ah Li-Ion) #

Charging Protocol #

• Fully charge the battery immediately upon receipt and after every use.
• Li-Ion recommended charge time: 4–6 hours. For a complete 100% charge, leave the battery on the charger for one additional full hour after the indicator light turns green.
• Never charge for longer than 24 hours.
• Li-Ion batteries have no “memory” effect — partial charge/discharge cycles will not harm capacity or performance.

Temperature and Storage #

• Rated output capacity is measured at 77°F (25°C). Temperature variation alters performance and shortens expected battery life; high temperatures especially reduce overall battery life and runtime.
• Store the battery at temperatures above 10°C (50°F) to prevent capacity degradation.

Part 3 — Component Assembly #

Front Wheel — Bolt-On Installation #

1. If the bicycle has rim brakes, loosen them so the wheel passes the brake pads easily. For disc brakes, no adjustment is required.
2. Place the wheel into the fork dropouts.
3. Install retaining washers with the raised lip pointed toward the fork, inserting into the small hole of the fork blade. Some units use a step retaining washer instead — slide its raised portion into the fork dropouts.
4. Install the axle nut and tighten, ensuring the wheel is centered between the fork blades.
5. Spin the wheel to confirm centering and brake clearance; adjust brakes if necessary.

Warning: Failure to properly tighten the front wheel connection may cause the wheel to dislodge.

Rear Wheel — Bolt-On Installation #

1. Loosen rim brakes as above (disc brakes require no adjustment).
2. Place the wheel into the frame dropouts and slide a washer onto each side of the axle.
3. Install axle nuts and tighten; confirm the wheel is centered in the frame.
4. Spin the wheel to verify centering and brake clearance.

Warning: Tighten both rear wheel axle nuts securely. Failure to do so may cause the rear wheel to dislodge from the dropouts, resulting in serious damage or injury.

Seat Post — Quick Release Adjustment #

The X21 MAX uses quick-release (QR) cam levers for seat height adjustment. QR levers rely on correct cam clamping force — understand the mechanism and apply sufficient closing force before riding to prevent serious injury from component slippage.

Part 4 — LCD Display and Controls #

The universal EKX series LCD display indicates speed, mileage, gear, headlight status, and PAS level, and provides fault warnings plus function settings. Controls include the power switch, gear increase/reduction buttons, high/low speed toggle, brake levers with motor cutoff, and the F/P/R/Light switch.

Part 5 — Error Code Diagnostics (X21 MAX) #

Part 6 — Mechanical Troubleshooting #

Part 7 — Maintenance Schedule #

Follow the periodic lubrication and inspection intervals defined in the manual's maintenance chart. Periodically disassemble the freewheel mechanism, inspect for wear or damage, and replace as necessary — ensuring correct reconnection upon reinstallation. Consult a qualified bicycle specialist if you have doubts about assembling, repairing, or maintaining the vehicle.

Frequently Asked Questions — EKX X21 MAX #

What motor and battery does the EKX X21 MAX use? #

The X21 MAX is equipped with a 3000W brushless motor and a 60V 30Ah removable lithium-ion battery — a higher-output configuration than the 2000W / 48V setup on the standard X20.

How fast does the EKX X21 MAX go, and what is its range? #

The factory-rated top speed is 55 km/h, with a maximum riding distance of up to 150 km per charge and a 150 kg load capacity.

Does the EKX X21 MAX use the same manual as the X20 and X21? #

Yes. All EKX series models (X20, X21, X21 MAX, X22, GTS) share the universal factory manual framework for safety, assembly, battery care, and maintenance. Only the specifications — motor power, battery voltage, and wheel size — differ by model.

What does error code E030 mean on the EKX X21 MAX? #

E030 indicates a Communication Failure between the LCD meter and controller. Check the communication harness for reversed wiring or breaks, confirm the controller and meter protocol match, and inspect the meter communication circuit for burnout.

How long should I charge the EKX X21 MAX battery? #

Charge the 60V 30Ah Li-Ion battery for the recommended 4–6 hours, plus one extra hour after the charger indicator turns green for a complete 100% charge. Never exceed 24 hours of continuous charging.

What wheel size does the EKX X21 MAX have? #

The X21 MAX rides on a 70/100-19 off-road wheel, unlike the 20×4.0 fat tires fitted to the X20 model.

📎 EKX X21 MAX User Manual — Free PDF Download