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Early 18 and late 18 original fat difference.

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I bought a original fat early this year with one gear, now I see that they come with 7 speeds. Does anyone know what changed to make this happen? Is the frame wider or what? I’ve been wanting to do a 3 speed conv. But would love the 7 speed.

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Mel, the 7 speed cassette Sondors X model comes with a different, slightly wider motor. The conversion, requires that a different motor and associated shifter hardware, while spreading the rear triangle a mere 5mm.  Both models of the 2018 Fat were avalable at the same time, not early or late 18. The 7 speed motor has a longer threaded and 5mm wider case to accommodate the larger Freewheel or Cassette, depending on motor model. 

Avalable from Aliexpress https://eunorauebike.aliexpress.com/store/group/BAFANG/904105_257734884.html?spm=a2g1y.12024536.pcShopHead_6161773.1_3_1

i just purchased a new 750watt motor there for a new project for $173.

Or, when in stock, you can buy the 750watt motor Domestic from :  https://velomobileshop.com/collections/sondors-ebike-power-upgrades/products/bafang-fat-bike-hub-motor?variant=12249194725399

“175mm Dropout Hub Motor.  Although slightly wider than the stock single speed Sondors bikes, this will drop into the existing case.  Upgrade your motor without swapping the wheel!

  • 750 watt motors USE A  LARGER MOTOR PLUG!  Larger controller with the appropriate plug required.
  • Threaded for single or multi-speed freewheel.“

Or: https://electrobikeworld.com/products/48v-750w-bafang-geared-rear-hub-motor

If you want to see what the process entails, most of the process, less the 750WATT upgrade parts, higher output battery,  aftermarket controller and LCD.  (you’ll need a new 350Watt, or better, 500 Watt longer cassette/freewheel mount motor, since you’ve already upgraded to a 25amp controller, for the upgrade less the 750watt & required 35amp controller. 


I suspect you’ve already reviewed the 3 speed thread. Most of the early posts in that thread are bogus, conjecture or just guessing so start your planning with Scott Kennedy’s post here and beyond.






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The frame is the same, but the motor housing is different.  You can change your single speed into a 3 speed without doing anything to the motor.

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