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OE Stock: May be supplied without retail packaging. Professional fitting required. The Bosch Active Line BES3 Drive Unit offers quiet, smooth assistance with 40 Nm torque, 586 W peak power, and a 15.5 mph support limit.
OE Stock: May be supplied without retail packaging. Professional fitting required. The Bosch Active Line BES3 Drive Unit offers quiet, smooth assistance with 40 Nm torque, 586 W peak power, and a 15.5 mph support limit.
Bosch

Bosch Active Line BES3 Smart System Drive Unit OE Stock in Grey

£450.00
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Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

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With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

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Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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Items must be returned in their original packaging and unused. Refunds will be issued once the product(s) have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:
1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £50 for collection (£100 from Northern Ireland). If you do not have the original box in usable condition, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid proof of purchase.

Bosch Active Line BES3 Smart System Drive Unit OE Stock in Grey

Season:All Year Round

Brand:Bosch

Code:5277942OEM

OE Stock Notice: This product may be supplied in bulk or non-retail packaging. Instructions, mounting hardware, and other accessories may not be included.

eBike Component Notice: This drive unit is intended as a replacement component for compatible Bosch Smart System eBikes. Professional installation may be required and this motor may not function correctly if not installed by an authorised Bosch dealer

Make every journey feel effortless with the Bosch Active Line BES3 Drive Unit. Designed for comfortable city riding and everyday commuting, this compact motor delivers smooth, natural assistance with up to 40 Nm of torque and 340% support, making it ideal for navigating urban streets and gentle hills.

Quiet operation is at the heart of the Active Line, allowing riders to enjoy their surroundings without distracting motor noise. Its finely balanced power delivery provides a harmonious riding experience, while Auto mode automatically adapts assistance to changing riding conditions.

Weighing approximately 2.9 kg, the Active Line combines practical performance with a compact design. Compatible with Bosch's Smart System, it supports modern eBike functions, including walk assistance with Hill Hold and hill start assistance, while providing pedal assistance up to the UK limit of 15.5 mph (25 km/h).

Key Features & Benefits:

  • Smooth, Quiet Assistance: Delivers natural-feeling power with minimal motor noise for comfortable everyday riding.
  • 40 Nm Torque: Provides responsive assistance for commuting, city journeys, and gentle climbs.
  • Intelligent Support: Offers up to 340% assistance, with Auto mode adapting support to riding conditions.
  • Smart System Integration: Supports compatible Bosch Smart System features, including walk assistance and hill start assistance with Hill Hold.

Full Specification:

  • eBike System: Bosch Smart System (BES3)
  • Maximum Torque: 40 Nm
  • Maximum Motor Power: 586 W
  • Rated Continuous Output: 250 W
  • Maximum Power at 70 rpm: 290 W
  • Maximum Support: 340%
  • Maximum Assisted Speed: 15.5 mph (25 km/h)
  • Start-Up Behaviour: Harmonious, Smooth
  • Shifting System Compatibility: Derailleur and Hub Gear Systems
  • Gear Shift Detection: Yes, Derailleur Systems
  • Gear Shift Detection for Hub Gears: No
  • Walk Assistance with Hill Hold: Supported
  • Hill Start Assistance with Hill Hold: Supported
  • Backpedal Braking: Optional, Depending on Bike Configuration
  • Approximate Weight: 2.9 kg
  • Maximum Power-to-Weight Ratio: Approximately 202 W/kg
  • Intended Use: Urban Riding and Commuting
  • Colour: Grey
  • Stock Type: OE Stock
  • Installation: Professional Installation and Compatibility Verification Recommended
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