250w Bafang Mid-Drive Kit with Frame Battery

From: $1,750.00


A mid-mount motor running on the chain gives you the powerful advantage of providing different gear ratios for the motor to perform in. When you are in a low gear (for taking off or hill climbing), you will get higher torque from the motor. And when you are in a higher gear, you will get more top speed from the motor. So, just like in a manual car. This leads to more efficient use of the battery, and the motor assists you at appropriate torque levels, selected by you based on the terrain.

*You do need to be competent with your gears to get the most from this system.

Choose from our range of versatile and practical frame-mounted batteries, designed for balanced comfort due to their central and low mounting position. The weight of the motor/controller unit is also in its best possible position down below the bottom bracket, worth half of any unsprung weight in the wheel (ie. compared to hub motors).

Kits must be installed by a REV Bikes dealer. This can be done at a REV Bikes dealership at no extra cost, or you can have a REV technician come to your premises and install for an additional fee (you must be within 50km of a REV dealer). REV Dealership locations are:

  • Victoria:
    • REV-Bikes HQ – Nunawading
    • Beuchat Bikes – Brunswick East
    • Drouin Cycles – Drouin
  • Tasmania:
    • Pedaltec Tasmania – Hobart
  • South Australia:
    • Ray’s Trikes – Woodside
Our Guarantee
**MONEY BACK SATISFACTION GUARANTEE upon Test Ride at pickup/delivery**


250w Bafang Mid-Drive Motor Kit with Frame Battery

Bafang motors are generally accepted to be the best after-market mid-drive motors in the industry. There is a reason they have such a good reputation.. we have seen for ourselves the quality control systems in place at the factory outside Shanghai, and we are definitely impressed with the performance of their mid-mount systems.

The motor mounts through any standard bottom bracket from 68mm – 73mm wide (press-fit bottom brackets require an adaptor, and we can get wider BB compatible motors for fat bikes etc, call us for details). The entire bottom bracket and crankset assembly is removed, and replaced by the motor and single chainring. Cranks are also included, and you can reuse your existing pedals (9/16″). Your rear gears will remain untouched.

The controller & pedelec are both internal within the mid-drive motor, which simplifies the fitting. The pedelec is very responsive, especially when appropriately choosing low gears to take off in. This is important on a mid-drive e-bike, like when driving a manual car, to get the most torque during take-off and hill climbing.

The handlebar controls provided include the optional-to-install throttle (thumb style). Throttles are not strictly road-legal on a 250w kit, but they are sometimes popular amongst people who really need assistance taking-off, before they have rotated their pedals enough for the pedelec to kick in. The left hand side of your handlebars will be available for fitting a thumb throttle, without clashing with any gear shifters (because the front gears are removed).

Also included are electronic cut-out brake levers, or magnetic cutout sensors which can be fitted to existing levers, to provide a safety cutout feature when braking. We also include a Shift Sensor, which cuts power temporarily while you change gears, to reduce stress and wear on your drivetrain. The existing gear cable is threaded through this sensor.

The market-leading colour LCD mounts over the headstem in the centre of the handlebars, with a loom out to the buttons, for them to be within easy reach. This shows all the functions and stats you could possibly want, on an attractive visual interface. You can choose to set it up with 3, 5 or 9 available pedelec levels.   These levels are easily adjustable from the LCD screen on the handlebars.

The final component is a speed sensor. The pick-up sensor is normally mounted to the chain stay beside the rear wheel, with a magnet fitted to one of the spokes.

The package is completed with a quality frame mounted battery, and there are a few different options available based on the distances you want to travel per charge. Mounting to the water bottle lugs in the triangle is ideal, as it’s good to keep the battery weight low and central, to make for a more comfortable and balanced ride.

We only use the top-quality battery chemistry of Lithium tri-metal (Nickel Manganese Cobalt Oxide, or NMC), which is the leading type used for electric vehicles at the moment. Read more on our batteries page. Also find links to sizing templates for the frame-mounting batteries, or you can order a Battery Template Kit by mail, so that you can confirm what fits, and order your ideal battery with complete confidence that it will suit your frame.

No longer will you be limited to where you can ride. The hills will feel flat, and the world will open up for you when you upgrade your bike with a REV-Bikes electric assist system. Book a Test Ride – we even come to you!

Our kits can electrify ANY bike, often giving a new life to your old trusty. But if you’d prefer a brand new and shiny bike, check out our recommended bikes for this kit.

We are so sure you won’t be disappointed, we are happy to offer you a 30 day 100% Satisfaction Guarantee on this kit.. Love it, or you’ll get your money back!

We provide 2 years warranty on all parts in the kit, and a lifetime warranty on our labour if we fit it for you – check out our Mobile Service.

See a range of bikes fitted with REV-Bikes Kits in our Gallery

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Battery Care Guidelines


This Attachment Never Expires.

Charging Practices, Prolonging the life of your Battery Pack, and Important Info for Battery Care