Motorized long-tail bike

Tongsheng TSDZ2 motor installed on the Yuba KOMBI bike

Yuba Kombi long-tail equipped with the Tongsheng TSDZ2 motor

A KOMBI bike electrified with the TSDZ2 mid drive motor. The motor firmware is upgraded with the TSDZ2 Flexible OpenSource firmware initiated by Casainho.

Typically, empty or loaded with two kids; three in rare occasions; 2300km so far with original bike chain and original motor blue gear and clutch.

The first blue bike (pictures below) uses a 36V motor - 36V battery (battery swing from 33V to 42.4V). A second bike realized with the 48V TSDZ2 motor - 48V battery (swing from 40V to 52V). The 48V version is more comfortable than the 36V version. With the 36V version, the battery swing does not allows to benefit the full potential of the motor when once it is half empty. This is not noticed with the 48V motor.

Problems encountered:

  • 2300 km: crank bearing noise. Seems cranck were not tight enough. Noise in warm weather (>15°C) Not changed yet but working fine (it’s winter time).
Original pedals

Motor Installation (1/3)

Original pedals

Accessing the BSA 68 bottom bracket

Motor Installation (2/3)

Accessing the BSA 68 bottom bracket

BSA 68 bottom bracket

Motor Installation (3/3)

BSA 68 bottom bracket

TSDZ2 lying against the front tube protected by an air tube

TSDZ2 motor installed

TSDZ2 lying against the front tube protected by an air tube

Battery vertically installed behind the seat

Yuba KOMBI bike equipped with TSDZ2 motor and battery

Battery vertically installed behind the seat

Setup for trailing a BMX race-mini bike (no-one on the BMX). The trailed bike is free to rotate about its steering wheel axis and vertically (up-down) following smoothly the front bike.

Yuba KOMBI bike trailing a bike

Setup for trailing a BMX race-mini bike (no-one on the BMX). The trailed bike is free to rotate about its steering wheel axis and vertically (up-down) following smoothly the front bike.

The front wheel of the trailed bike is engaged in a fence of the foot pod. A strap maintains the front wheel firmly attached to the trailing bike providing two degree of freedom to the trailed bike frame. A second strap helps to maintain the bike the same vertical plane. Note the foot-pod fence small angle providing space for kids foots on the front bike.

Attachment setup for trailing another bike

The front wheel of the trailed bike is engaged in a fence of the foot pod. A strap maintains the front wheel firmly attached to the trailing bike providing two degree of freedom to the trailed bike frame. A second strap helps to maintain the bike the same vertical plane. Note the foot-pod fence small angle providing space for kids foots on the front bike.

Yuba KOMBI bike attached with two other bikes on the car rack.

KOMBI bike on a car rack

Yuba KOMBI bike attached with two other bikes on the car rack.

Various

https://em3ev.com/

  • 36V battery: 3.385 kg
  • 42V battery: 3.965 kg
Lubin Kerhuel
Lubin Kerhuel

Interested in signal processing and control theory. 10 years experience with rapid control prototyping.

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