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Availability:
20 left in stock
Arrives
Wednesday, Nov 18
At a glance
- Condition
- New
- Model
- TSDZ-2B
- Color
- Black
- Material
- Aluminum
- Bike Type
- Electric Bike
- Wheel Size
- 26 in
- Suspension Type
- Dual
- In the box
- 500W/750W/1000W Mid Drive Kit
- Warranty
- 30 Days return time,365 days warranty service,Lifelong technical guidance service
Features 6
- [ Torque Sensor Mid Drive System for Natural Riding Feel ] The TSDZ series features an advanced torque sensor that automatically adjusts motor assistance according to pedaling force, delivering a smooth, responsive and natural riding experience. Compared with cadence-based systems, power output feels more intuitive and efficient, making starts, acceleration and climbing more comfortable while helping extend battery range for daily riding
- [ Choose Motors to Match Usage ] Multiple power variants suit diverse riding demands. The 48V 500W generates 80N.m peak torque with a top speed of 40km/h, offering steady power perfectly suited for daily city commutes. The 48V 750W reaches 140N.m torque and 50km/h max speed, excellent for hilly routes and sustained steep climbs. The powerful 48V 1000W outputs 160N.m torque up to 60km/h, ideal for off-road trips, cargo transport and high-speed custom builds pursuing strong dynamic performance
- [ 4 Riding Modes for Total Control ] Switch seamlessly between E-bike, Pedal Assist, Walk Assit , or Traditional Cycling mode to match your energy, terrain, or fitness goals. Preserve knee health on steep climbs, save time with electric throttle, or enjoy exerciseall while the LCD display tracks speed, mileage, battery life, and time. Upgrade to the EKD01 Blue*tooth display for navigation and ride analytics
- [ All-Weather Durability & Universal Compatibility ] Built for year-round adventures, this IP65 waterproof mid drive electric bike kit thrives in rain, snow (-20C to 45C), and daily weather. Compatible with road bikes, mountain bikes, hybrids, or even tricycles (68-73mm BB width), its perfect for commuters, seniors, or delivery riders seeking reliability. Includes pre-installed cables, detailed guides, and plug-and-play componentsno expertise needed to revive your old bike!
- [ Customizable Battery Options with Security ] Choose from downtube or rear-rack batteries to fit your budget and range needs. All batteries feature anti-theft locks, certified safety systems, and clear charge indicators. Extend rides up to 55Mile* (*varies by capacity) for errands, scenic tours, or hassle-free senior mobility
- [ Affordable Eco-Upgrade for Every Rider ] Skip expensive e-bikesrevive your current bicycle into a high-performance electric machine at a fraction of the cost! Seniors gain effortless mobility; commuters slash riding time; adventurers tackle rugged trails
Description
Varstrom creates high‑performance e‑bike conversion systems, offering mid‑mount & hub motor kits, smart displays, batteries and essential components. More than a supplier, we aim to be your trusted ride partner. Through innovation and meticulous craftsmanship, we deliver remarkable power, responsive performance and freedom for global riders. Favored by DIY tinkerers and pros on Amazon, Varstrom reshapes electric riding experiences.
Specs 19
| Bike Type | Electric Bike |
|---|---|
| Age Range (Description) | Adult |
| Brand | Varstrom |
| Number of Speeds | 9 |
| Color | Black |
| Wheel Size | 26 inches |
| Frame Material | Aluminum |
| Suspension Type | Dual |
| Special Feature | LCD-Display |
| Additional Features | LCD-Display |
| Brake Style | Disc |
| Intended Riding Terrain | Paved Roads, Unpaved Trails |
| Bicycle Drivetrain Type | mid drive |
| Electric Assist Type | mid-drive motor |
| Age Range Description | Adult |
| Brand Name | Varstrom |
| Model Name | TSDZ-2B |
| Manufacturer | Suzhou Tong-sheng Electric Co., Ltd. |
| Frame Material Type | Aluminum |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Nov 18
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Top Amazon Reviews
The ease to which of the paddling is so much easier. And the speed is quite amazing.
This E bike motor and kit is amazing very well satisfied. The instructions are a little iffy but with a little mechanical aptitude it is no problem installing it. It is much more than I expected. Would recommend it 1000 times over.
Reviewed in the United States on September 11, 2025 by Marluseb
I’m very pleased, great mid drive motor.
I bought it as a gift for my wife and now I’m jealous. This mid drive is a beast. Very sturdy and efficient. The torque sensor works well, and it was not difficult to mount, although you must have some familiarity with bikes.
Reviewed in the United States on March 22, 2026 by eshayer
Nightmare to install but worth it
The biggest issue I had with this product was the installation, which I do NOT recommend doing on your own unless you know what you are doing. I know some basics but if you've never touched your crank or bottom brackets before, you should definitely educate yourself on how to remove those BEFORE starting the process. I installed this onto a 29in, 21-speed full suspension MTB that I had bought for cheap off a neighbor. The installation can be split into multiple parts - the motor, the battery, the handlebar gadgets, and the wiring and speedometer, so I'll share my opinion of each one. HANDLEBARS: Easiest to do, you will need to remove existing stuff off the handlebars, then install the throttle, display, and replace your brake levers with the ones included in the kit (since they have wiring to shut off the motor when the brakes are engaged). This can be done easily with the appropriate Allen wrenches - for me a 3mm, 4mm, and 5mm got everything off, and the brake cables were easily tied into the new levers, through I did have to adjust the brakes after. I ended up leaving my front chainring gearshift on as a dummy and installing the throttle on the left, and display on the right. Depending on the display type it may not be obvious which way its supposed to go so I ended up installing mine backwards, but I was able to fix it. BATTERY: Depends on the battery and your bike. For me, this was the worst part of the installation since my bike does not have the mounting holes on the rear frame that were needed for the rear-rack mounted battery, so all the mounting equipment it came with was useless. I ended up zip-tying the battery rack to my existing rear rack attached to the back of my seat post. It's definitely not secure against thieves but it works well enough. However, if I had to redo it, I would instead go with a battery mounted on the frame triangle (where the water bottle holder is). At least my kludge solution does keep the battery on for riding. MOTOR: I've never touched a bottom bracket before, and this is where I was out of my depth. While I was able to get my cranks and 3-size chainring off with a crank tool, I did not realize you needed special tools to deal with a bottom bracket and there's about 50 different versions each with their own bespoke tool needed. I ended up ordering the wrong BB tool type at first, when I realized my mistake I looked up the actual tools needed, saw that they were 60 bucks, then finally gave up and took the bike with the pedals and cranks removed to a local bike shop. They were able to remove the BB within 5 minutes and only charged me $10, but they flatly refused to help me install the motor due to "liability" issues, so I was on my own. The part of the motor that fits into the space where the BB used to be DID fit, but barely - and by barely I mean only after liberal application of moly grease and beating it into the hole with a rubber mallet millimeter by millimeter over the course of an hour. Because my bike has a rear suspension, I was unable to install the bracer and bracer bolt where it was supposed to go, but in the end it fit my bottom bracket so tightly I don't think the bracer is necessary. I ended up getting the 44T size drive sprocket model since it matched the size of my largest chainring, and while I no longer need it the motor DID fit alongside my front chainring derailleur, so I decided to keep it on and routed my chain through it to help keep the chain in the correct position. WIRING and SPEEDOMETER: Was pretty self-explanatory, the wiring plugs are nicely color coded and the multi-plug bus that goes to the handlebars had plenty of length. The speedometer sensor fits nicely to the inside of the rear frame and the magnet just goes on a spoke w/o tools. I recommend ordering a nice big pack of zip ties to keep the wires tight to your frame except for the handlebar ones, which need some slack so they don't interfere with turning. PERFORMANCE: Really great, actually! I used it this morning to commute to work. Even on its lowest assistance setting it has enough power to start me off and help me maintain speed when going up hills and against the wind. I tend to run it mostly on that level, with an occasional bump up to 2 or 3 for particularly nasty hills or if I'm just tired. I rarely use the throttle but when I do it works as expected. Very responsive to my pedaling speed. While I did not get a gear shift sensor, I can still shift the rear drive cassette just fine since I usually stop pedaling out of habit when shifting gears. It also seems to just sip power from the RR battery, it was still reading a mostly full charge after about 5 miles of riding, though that may be due to it being an oversized capacity. OVERALL: Great way to spruce up an old mountain bike lying around... just make sure you know what you are doing first, especially with bottom brackets since they tend to be a nightmare without the necessary tools to remove them which can be expensive. I recommend looking up videos on how to remove a crank and how to identify the many, MANY different types of bottom bracket, or just take it to a bike shop and pay them to do it for you since they probably already have the tools you need. Finally, when installing make sure you have a hefty rubber mallet, some moly grease, and most of all, patience. This ended up being a weeklong project to retrofit to my bike, but in the end I'm satisfied with the result.
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Reviewed in the United States on July 21, 2026 by Korrin
Super motor!
Super good torque sensing operation! The throttle comes on slow and smooth. The torque operation has a slight pause which is fine on my gravel bike. I can not recommend it for MTBing though. It will work just fine until you hit something and tear out the wiring that comes right out of the bottom of the motor. Unfortunately, I received a faulty display and I talked to Valstrom and he said he would send me another one. Well, it's been 3 weeks now and I have not received it. Now, I don't see any way to further contact them. Not very good customer service.
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Reviewed in the United States on August 13, 2025 by Capt Chip
Slow with short range! 750 Watt would have been than this 500watt.
More of a pedelec than a standard throttle ebike. I can get to about 16mph on throttle maybe 17mph on PAS. The PAS is faster, though I really dislike the slugishness of this type of PAS system. Range on a brand new 48V 15AH Hailong small triangle battery at around 9 miles. This is a 500watt system and Class 2.
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Reviewed in the United States on March 27, 2026 by Anonymous 1
Priced well and not overly difficult to install
Priced well and not overly difficult to install. Works as expected and lots of fun. Good customer service, which was clutch given the myriad configurations available (which may be the only negative comment I would have—it can get confusing knowing which parts to order and what gets installed where). Update after several rides/months of ownership: still very pleased and no issues.
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Reviewed in the United States on November 8, 2025 by Border Brother
Great Buy!!!
I bought this for my boyfriend friend, he loves it, exactly what he wanted and he can't wait to install it!!!
Reviewed in the United States on April 6, 2026 by Janelle B.
Having a blast
Got the system put together in about two hours. Only issue is the speedometer. I installed per instructions, but the speed jumps around. I'll ride at 8mph and the speed will go to 15, 8, 40, 6, 99, just jumps all over. The sensor is at 1.5mm from the magnent. The only thing that helped was to move the magnet away from center on the sensor. Now the speed does not read when moving slow, but is accurate above 7ish mph. Now for the rest. I got the TSDZ16 with a 48v 20ah battery. On my bike, I could not use shims, and my chain line is off. This will differ on other bikes. No big deal, I no longer need my ultra low gears. Using level 2 assist, I can climb any hill. In a high gear on level 5, I can easily do 35+mph, going uphill. I'm 200+ lb and can easily cruise with little effort. When just riding for fun, I use setting 1 or two depending on how steep the hill is and went 42 miles, using only 35% of my battery. I did not install the thumb throttle, brake or gear sensors. I just have to remember to stop pedaling, shift, pedal. Using this setup, I now know I do not need anything over 500w. I also bought to large of a battery. If I knew what I know now, I would have bought the smaller motor and a smaller battery. However, having that extra power is FUN! Battery wise, I had to install on a bike rack because it was too big for my frame. When ordering a battery, remember that if it is on a bracket, you need room to slide it in. I'm looking at buying a smaller amp hour battery so I can mount it to the frame. The reason for the reduction in a star is customer service. I wrote to Varstrom about the speedometer issue two weeks ago, I did not get a response. So it appears that if you have an issue, you are on your own.
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Reviewed in the United States on October 25, 2025 by mitsaru