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36V 250W Tongsheng Mid Drive motor – very small, with torque sensing

(2 customer reviews)

£389.00 inc VAT

A tiny torque sensing 250W mid drive motor and screen – this means that the harder you work, the harder it works.  It has been engineered to be as small and light as possible whilst being one of the toughest motors we sell. Its also very cost effective!

Please select your 36v battery HERE.

SKU: MTS250C Category: Product ID: 4194


The Tongsheng mid drive 250W motor is a great way to upgrade your bike to an ebike – and remain completely road legal. Unlike the Bafang motors, it rewards effort by helping more as you pedal more (it has a built in torque sensor). They are also significantly smaller and lighter than the Bafang units.

Please watch the video below to see how to install, or we can install for you.

Key information:

  •  36V 250W mid drive motor with torque sensor
  • Brake sensors are not required
  • No thumb throttle – this provides assistance when you pedal
  • Suitable for most bikes
  • LCD Display
  • 42T chainwheel
  • Replacement cranks (both sides!)
  • All required cables
  • Fits 67 – 73mm BSA bottom bracket. Contact us if you need help identifying

Can I fit this myself?

Read our fitting guide here. If you require tools to take off your bottom bracket, pedal cranks and maybe split your chain, follow this link to purchase all of the tools.  If in doubt, get us to do the work!

How do I know if this mid drive motor fits for my bike?

This mid drive motor is designed to fit bikes with a 68mm (2.68inch) or 73mm (2.87inch) wide bottom bracket. The inner diameter of the bracket should be not less than 33.5mm.  Most modern bikes sold in the UK meet this standard (but please check).  We have a bottom bracket guide here.

We also provide a set of spacers to help you adjust the motor to fit your bike.


The Tongsheng torque sensor motor kit comes with a  1 year warranty based on purchase date. Please return to us for repair or replacement.

UK Legal Status

This is fully UK road legal.


Additional information

Weight 5.6 kg
Dimensions 26 × 26 × 26 cm
Bottom Bracket Size



Waterproof Grade

2 reviews for 36V 250W Tongsheng Mid Drive motor – very small, with torque sensing

  1. Julie (verified owner)

    Henry and team,
    I brought a Tongsheng Mid Drive Motor 36v 250W with 36v 19.2 AH battery for Christmas and have now had plenty of time to try it. The news is, I love it! It performs just as I wanted just like a normal bike, just with more power on each pedal. I can now keep up with the rest of the family and I no longer stay at home, because I can’t go the distance.
    When I got the package in the post the display was missing from the box, but with a phone call the item was very quickly dispatched. Infact all the team at Custombuild-ebikes have gone above and beyond in their service and help with my many questions.
    I was keen to put the motor on my Whyte’s mountain bike, but to my dismay found it didn’t fit. The Whyte’s bikes have a larger bottom bracket outer than the norm, so not enough room to slot on. We put it on my second choice bike and it fitted fine. The electrics were tricky and need some know how.
    We live in the Peak District where it is hilly to say the least and I have now done 80km and the battery is down to 1/3 (using tour setting for most of it, off on the down hills and speed setting for most of the hills.)
    I find the Turbo great for getting across junctions quickly and speeding up hills with a car behind.
    I now find I am challenging myself to reduce the power and work hard, but every now and then whizz past the rest of the family especially on the last hill home.

  2. John (verified owner)

    For some time I had been considering getting an E bike as some of my friends have them and they dramatically increase the range they can cycle. I spent some time researching different options and finally decided to fit a motor to my existing touring bike, rather than buy a ready made Ebike.
    I settled on a Tongsheng 250 W kit which I purchased from CustomBuilt-eBikes and I fitted it to my Raleigh Randoneur tourer, a bike that I’m really comfortable with. I’m absolutely delighted with the conversion. It was easy to carry out and I think anyone with a little mechanical ability could do it. The only issue that needed a bit of thought was the fitting of the battery as the bottle screw fixings on the down tube were too low so I had to make an aluminium bracket to provide fixing points further up the down tube. I have photographs of this if anyone is interested.
    I’ve done a few miles on the bike and I’m very impressed with the mileage that the 17.5Ah battery gives me, on the first charge I covered 111 miles and still had 1 bar showing on the battery indicator. Most of my riding has been done with the motor at levels 1 or 2 and if the going was particularly easy I didn’t use the motor at all. Regardless of this I think 111 miles is pretty impressive.
    Custom-built E bikes have been a pleasure to deal with, I found them very friendly and helpful throughout, even when I made a stupid mistake regarding fitting the cranks which is too embarrassing to recount here. In conclusion I now have and an Ebike which I’m comfortable on for a lot less than the cost of buying a ready made one.

    Regards, John

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