- No. 43, Yushan Road, Huqiu District, Suzhou City, Jiangsu Province, China
- +8613671928471
- dafuli01@ebikeserviceparts.com
High‑strength alloy‑steel main large gear assembly for Tongsheng TSDZ2B mid‑drive motor. Delivers 4:1 torque amplification, <50dB low‑noise running, plug‑and‑play install, ideal for repair, heavy‑load & hill‑climbing e‑bike upgrade.
Note: This gear assembly only fits Tongsheng TSDZ2B motor. Please confirm your exact motor model before placing an order to avoid mismatch.
✅ Optimized Power Transmission & 4:1 Torque Amplification
Advanced gear‑meshing geometry delivers efficient power transfer. It provides 4:1 torque amplification for effortless hill‑climbing, with operating noise kept under 50dB for smooth, quiet rides.
✅ High‑Strength Machined Alloy‑Steel Construction
Precision‑machined from heavy‑duty alloy steel. It achieves 80 % higher wear resistance compared to original plastic gear alternatives, greatly improving durability under high‑torque conditions.
✅ Plug‑and‑Play Zero‑Adjustment Installation
Comes with OEM‑matching mounting interfaces for direct plug‑and‑play fit. No extra modification or manual adjustment required during motor rebuild, saving repair time for workshops and DIY builders.
✅ Excellent Performance for Heavy‑Duty Scenarios
Performs reliably on inclines and under heavy‑load cargo‑transport conditions. Built‑in vibration‑dampened design guarantees stable operation on both city pavement and rough rugged terrain.
✅ 10,000 KM Durability Test Verified
Validated by 10 000‑kilometer durability testing. This OEM‑compatible gear module extends motor service intervals. Combines industrial‑grade mechanical performance with smooth cycling dynamics for year‑round dependable service.
Product Name: Tongsheng TSDZ2B Main Large Gear Assembly
Part Number: TSDZ2B
Type: Large Gear Assembly
Material: Alloy Steel Metal
Color: Silver
Dimension: Approx. 11.5 cm / 4.53 inch
Applicable Motor: Tongsheng TSDZ2B mid‑mount mid‑drive e‑bike motor
Manual measurement tolerance of 1‑2 cm may exist for dimension data. Please confirm dimension acceptability before purchase.
Slight color variance may occur due to different monitor screen displays.
Only the listed large gear assembly is included. Other motor components shown in reference images are not contained in the package.
We specialize in mid-drive motors and e-bike parts. Strict testing, powerful R&D and flexible OEM service guarantee long-term cooperation.
It used to take me weeks to hunt down hard‑to‑find e‑bike spare parts. Their compatibility‑check technical support saved me countless repair headaches. Reliable supplier I can always count on.
For more FAQs and further details, please get in touch with us
We supply genuine OEM parts and premium compatible aftermarket replacement parts for e-bikes, including motor components, controllers, throttles, PAS sensors, wiring harnesses, connectors and Bosch form-factor batteries.
We serve mainstream drive system manufacturers: Ananda, Bafang, Aikema, Tongsheng, Shengyi, Bosch and more. We also provide repair components for complete e-bike brands including Sur‑Ron, Aventon, Trek and many others.
All items are brand-new and inspected before shipment. We do not supply second-hand or refurbished goods.
Our team verifies compatibility according to your bike model, motor info or original part photos. We confirm available OEM parts or recommend workable alternative solutions.
Yes. Flexible order sizes are supported, ranging from single spare parts to bulk purchases.
Sea freight, air freight and rail transport are optional.
Lead time varies by item and shipping mode. We confirm exact timelines before each order and share tracking updates.
We provide part identification, model matching and full order follow-up support.
