1. はじめに
This manual provides detailed instructions for the installation, operation, and maintenance of your Varstrom 500W Electric Bike Conversion Kit, specifically for the Vd04 model with a 26-inch wheel. This kit is designed to transform a standard bicycle into an electric bicycle, offering enhanced performance and versatility for city commuting, mountain biking, delivery, and cargo transport. Please read this manual thoroughly before installation and use to ensure proper function and safety.
2. 安全情報
Always prioritize safety when installing and operating your e-bike conversion kit.
- Wear a helmet and appropriate safety gear when riding.
- 特に濡れた状態では、乗車前にすべての接続が安全かつ防水であることを確認してください。
- Regularly inspect your bicycle and the conversion kit components for wear, damage, or loose parts.
- 地元の電動自転車の規制と法律をよく理解しておきましょう。
- Do not attempt to modify the motor or controller, as this may void the warranty and create safety hazards.
- Keep hands and clothing clear of moving parts, especially the motor and wheel spokes.
- メンテナンスや調整を行う前に必ず電源を切ってください。
3. パッケージ内容
The Varstrom 500W Electric Bike Conversion Kit includes the following components:

図3.1: 以上view of the comprehensive assembly kit components.
This image displays the complete set of components included in the Varstrom 500W Electric Bike Conversion Kit. It shows a motor with rim, an LCD display, a controller, a controller case, a thumb throttle, brake levers, a standard left PAS sensor, a 1T4 waterproof cable, and a user manual.
- 1 x Rear Hub Motor with Rim (26-inch wheel)
- 1 x LCD Display (VD04 model)
- 1のxコントローラ
- 1 x Controller Box
- サムスロットル x 1
- ブレーキレバー1組
- 1 x Left PAS Sensor
- 1 x 1T4 Waterproof Cable
- All necessary cables and mounting hardware
- ユーザーマニュアル x 1
4. 仕様
Key technical specifications for the Varstrom 500W Electric Bike Conversion Kit:

図4.1: Detailed motor specifications.
この画像は包括的な概要を提供しますview of the motor's technical specifications. It highlights a maximum speed of 58 km/h (36 mph), maximum torque of 65 N.m, maximum controller current of 18A, rated voltage of 48V, rated power of 500W, and compatibility with Disc/V brakes. It also specifies the geared brushless rear hub motor's installation width of 142mm (5.59"), 12G silver spokes with double wall rim for 20"/26"/27.5"/28"/29"/700C, and a 500mm cable with quick release waterproof connector. Compatible rear dropout is 138-145mm (5.43-5.71") and fork notch width is 10mm (0.39"). The disc brake diagonal hole distance is 44mm (1.73") and adjacent hole distance is 22mm (0.86"). It explicitly states compatibility with cassette freewheel and incompatibility with standard freewheel.

図4.2: Wheel and motor size specifications.
This image details the size specifications of the motor and wheel. It shows a motor diameter of 166mm, an axle length of 204.5mm, and a compatible rear dropout size of 138-145mm. The rim diameter is specified for 20" (420mm), 26" (571mm), 27.5" (596mm), and 700C (634mm). Compatible rim diameter is 1.5-2.4" and spoke specification is 36H*12G.
| 特徴 | 仕様 |
|---|---|
| ブランド | Varstrom |
| モデル名 | 125XVH 48V 500W RDC |
| 巻tage | 48ボルト |
| ワットtage | 500ワット |
| 最高速度 | 58 km/h (36 mph) |
| 最大トルク | ≥65 N.m |
| 無負荷速度 | 415 回転 |
| 材料 | アルミニウム |
| 防水等級 | IPX5 |
| 対応ホイールサイズ | 20", 26", 27.5", 28", 29", 700C |
| 後車軸長さ | 204.1mm |
| Dropout Spacing | 138~145mm |
| カセットの互換性 | ≤10-speed cassettes |
| 表示モデル | VD04 (3.5-inch IPS, Navigation, Multi-language, Quick switch to 25km/h) |
5. セットアップとインストール
Installation of the Varstrom e-bike conversion kit requires basic mechanical skills and tools. It is recommended to consult a professional bicycle mechanic if you are unsure about any steps.
5.1 インストール前のチェック
- Ensure your bicycle's rear dropout spacing is between 138-145mm.
- Verify your bicycle's wheel size matches the kit (26 inches for this model).
- Confirm your cassette is compatible (≤10-speed).
- Gather all necessary tools (e.g., wrenches, screwdrivers, cable ties).
5.2 インストール手順(全般)view)
- 後輪を取り外す: Carefully remove your bicycle's existing rear wheel.
- モーターホイールの取り付け: Mount the new motor wheel into the rear dropouts, ensuring it is centered and secured with axle nuts.
- マウントコントローラー: Secure the controller and controller box to the bicycle frame, typically near the seat tube or down tube.
- PASセンサーをインストールします。 Attach the left Pedal Assist System (PAS) sensor to the crank arm, ensuring proper alignment with the magnet disc (if separate).
- Install Display and Throttle: Mount the VD04 LCD display and thumb throttle on the handlebars in a comfortable and accessible position.
- Install Brake Levers: Replace your existing brake levers with the provided e-bike specific brake levers, which include motor cut-off switches.
- 配線を接続: Connect all components using the provided waterproof cables. Ensure each connector is fully seated and secured. The 1T4 waterproof cable simplifies connections.
- ケーブル管理 Route and secure all cables neatly along the frame using cable ties to prevent snagging or damage.
- 最終チェック: Before riding, perform a thorough check of all connections, brake function, and wheel alignment.

図5.1: Visual guide for connecting the upgraded controller to various components.
This image illustrates the upgraded sine wave controller and its various connections to the e-bike components. It shows the controller connected to the motor wheel, battery, display, throttle, PAS sensor, and brake levers. The image also highlights the importance of using the correct PAS sensor for hollow crank sets.
6. 操作手順
Once installed, operating your Varstrom e-bike kit is straightforward.
6.1 電源のオン/オフ
- To power on the system, press and hold the power button on the VD04 LCD display.
- 電源を切るには、もう一度電源ボタンを長押しします。
6.2 VD04 LCD Display Functions

図6.1: VD04 LCD Display interface and specifications.
This image showcases the VD04 LCD display, highlighting its 3.5-inch IPS screen, dimensions (89.3mm x 60.8mm x 6.4mm), and various functionalities. It displays speed (KM/H or MPH), trip distance, odometer, average speed, power output, and battery level. The display also features navigation, multi-language support, and a quick switch to 25km/h. Speed limit settings range from 1 to 99 km/h, handlebar mounting diameters are 22.2mm/25.4mm/31.8mm, assist levels are 3, 5, or 9, and it includes a Type-C 5V 1A USB port for charging.
The VD04 display provides essential riding information and control:
- スピード: Current speed displayed in KM/H or MPH.
- バッテリー残量: バッテリー残量を表示します。
- アシストレベル: Adjust pedal assist levels (3, 5, or 9 levels available) using the '+' and '-' buttons.
- 旅行/ODO: View current trip distance or total odometer reading.
- ナビゲーション: The VD04 display supports navigation features.
- 多言語: ユーザーの利便性のために複数の言語をサポートします。
- 制限速度: Quick switch to 25 km/h speed limit.
- USB充電: Features a Type-C 5V 1A USB port for charging external devices.
6.3 ライディングモード

図6.2: Illustration of the four available riding modes.
This image depicts a cyclist riding an e-bike and highlights the four distinct riding modes available with the Varstrom kit: Throttle, PAS (Pedal Assist System), Manual, and Boost.
- スロットルモード: Engages the motor directly via the thumb throttle, providing power without pedaling.
- PAS(ペダルアシストシステム)モード: ペダルを漕ぐとモーターがアシストします。アシストレベルはディスプレイで調整できます。
- 手動モード: モーターアシストなしでも、従来の自転車と同じように自転車に乗ります。
- ブーストモード: Provides maximum motor power for quick acceleration or climbing steep inclines.

図6.3: Varstrom 125XVH motor performance.
This image shows a person riding an e-bike, emphasizing the powerful performance of the 125XVH motor. Key performance metrics are displayed: 58 km/h (36 mph) max speed, 415 RPM high speed, and ≥65 N.m high torque.
7. メンテナンス
Regular maintenance ensures the longevity and safe operation of your Varstrom e-bike conversion kit.
- クリーニング: モーター、コントローラー、ディスプレイをクリーニングします。amp 布で拭いてください。電気部品に直接高圧洗浄をかけないでください。
- 接続: すべての電気接続部の締め付け具合と腐食を定期的に点検してください。防水コネクタが適切に密閉されていることを確認してください。
- ブレーキ: Inspect brake pads and rotors for wear. Adjust or replace as necessary. Ensure the motor cut-off function of the brake levers is working correctly.
- タイヤ: Maintain proper tire pressure and inspect for wear or damage.
- チェーンとドライブトレイン: Keep the chain clean and lubricated. Check for wear on the cassette and chainring.
- バッテリーのケア: Follow the battery manufacturer's instructions for charging, storage, and maintenance. Avoid fully discharging the battery.
- モーター: The 125XVH hub motor is designed to be maintenance-free for up to 100,000 kilometers.
8。 トラブルシューティング
If you encounter issues with your e-bike kit, refer to the following common troubleshooting steps:
| 問題 | 考えられる原因 | 解決 |
|---|---|---|
| モーターが作動しない | Loose electrical connection, low battery, brake lever engaged, PAS sensor issue. | Check all connections, charge battery, ensure brake levers are fully released, inspect PAS sensor for proper alignment. |
| ディスプレイがオンにならない | Loose power cable, dead battery. | Check display cable connection to controller, ensure battery is charged and connected. |
| パワー/範囲の減少 | Low battery charge, battery degradation, incorrect assist level. | Fully charge battery, consider battery replacement if old, increase assist level. |
| モーターからの異音 | Loose components, internal motor issue. | Check for loose spokes or other components. If noise persists, contact customer support. |
For further assistance, please contact Varstrom customer support.
9. 保証とサポート
Your Varstrom Electric Bike Conversion Kit comes with the following warranty and support:
- 戻り値: 30-day free returns.
- 修理: 1年間の無料修理サービス。
- 相談: Lifetime after-sales consultation.
For warranty claims or technical support, please refer to the contact information provided with your purchase or visit the official Varstrom webサイト。