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Tongsheng TSDZ2 vs Bafang BBS02

The Bafang BBS02B has a low gear ratio of 20, which causes a low motor-efficiency. That is why the Bafang BBS02 was not interesting for me, and I did not initially include it in the comparison.
Later, in 2014, the Tongsheng TSDZ2 was released, and this is a much better alternative to the Bafang BBS02B.

Read this article from Tony from eBike Choices where he compares both mid-drive motors.

The big advantage of the Tongsheng TSDZ2 and the Bafang BBS02, is that all parts are available, in contrast to Yamaha and Shimano which are hardly repairable.

Main advantages of the Tongsheng TSDZ2 compared to the Bafang BBS02B

  • Larger gear ratio 41.85 vs 20
  • Lighter pedaling without motor support

Tongsheng TSDZ2 gear stages

The total gear ratio = 93/10 * 36/8 = 41.85

Tongsheng TSDZ2 gear 93/10
Tongsheng TSDZ2 gear 93/10

Tongsheng TSDZ2 gear 36/8
Tongsheng TSDZ2 gear 36/8

Bafang BBS02B gear stages

The total gear ratio = 62/11 * 32/9 = 20.04

Bafang BBSO2 gear 62/11
Bafang BBSO2 gear 62/11

Bafang BBSO2 gear 32/9
Bafang BBSO2 gear 32/9

Bafang BBSO2 gear 32/9
Bafang BBSO2 gear 32/9

Tongsheng TSDZ2 weight reduction

I think the weight of the bare motor could be reduced to around 2.5 kg:

  • An ISIS crank with accompanying lightweight cranks
  • Replace the motor with an Astro 3205 motor
  • Make the housing lighter
  • Lightweight gears

Do you have any comments about the website or problems with shopping? Please let me know.