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Varstrom provides 68 to 73mm/100mm/120mm BB size for BBS series (250W/350W/500W/750W/1000W) mid drive kits. 68 to 73mm BAFANG mid drive kits are suitable for most bicycle frames (the bottom bracket size), if you still don't know whether our motor is suitable for your bicycle, you can download and print our measuring paper for measurement, or you can contact us to confirm the size.

Chainring
Varstrom provides 36-tooth, 44-tooth, 46-tooth, 48-tooth, 52-tooth for BBS series motors. More teeth will give the e-bike system higher top speeds, but a reduction in torque or acceleration. If you need to climb and the road is full of gravel, you can choose a smaller chainring, if you ride more on the road, you can choose a larger chainring.

eBike Display Function
Varstrom offers a wide range of e-bike displays, the small and compact displays, the horizontal or vertical screen, functional or multifunctional. You can choose the appropriate instrument according to the function you need. If you want to learn about our displays, you can click the links to visit the pages of our displays for more information.
BAFANG eBike Displays: BAFANG DP C181, BAFANG DP C18, BAFANG C961.
Varstrom eBIke Displays: Touch T1, P860C, B02N, B750C, P850C, 850C, 500C, 500C-V, DM03, 800S.

New Battery Connector Design
The new HAILONG battery connector adopts a new design, the pins are no longer the entirety of the connector, but are protected in the connector. The new design can protect the pins from being bent when the bicycle is in vigorous moving, and the gold-plated design also reduces the resistance of the connector, reducing the chance of the connector being burnt.
All included in our mid drive eBike kits
Varstrom's Gift
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LED eBike Front Light
Varstrom sends you a LED front light as a gift for free.
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BAFANG Motor Wrench
This gift is used to install or uninstall the mid motor.
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250W Label Tag
Products are inspected and QC labels assigned before shipping