Based on producing traditional E-bike parts, we have developed successfully three main systems for middle motors drive system,TSDZ-2 and TSDZ-3H, as well as torque sensor driving by constant creation and sedulous innovations,Certified by TUV and owned decade domestic and international patents attributed to our reliable quality and modern technology, ours have obtained wide recognition and high compliment from our clients worldwide due to its updated technology, environment & health friendly and universal applications after their coming into being. We own strong developing strength, huge capacity and completed quality control system, we got certificate of ISO9001 in 2006. The products have been widely sold not only in domestic but also in Europe, Japan, southeast Asia, America and etc. Tongsheng is aim to make geared hub motors, middle motors (crank drive) and conversion kits.Innovation and Development.