The Yuba Mundo BMC Forsen two wheel drive electric bike!

One of the fun things about owning a bike shop, especially an electric one, is getting to try out fun and crazy new things.

We recently received a batch of new BMC motors, dubbed variously “600W” or “version 2” (V2). They are purported to be for higher speed use.

We decided to set up the BMC motor on the Yuba Mundo as a rear wheel drive, and the Mundo already has a Forsen 1000W/36V motor on the front. Why not? An all wheel drive bicycle with about 1800 watts of power. Somehow that seems appropriate for the Yuba, which can carry over 400lbs of cargo.

Pictures are below. Brief details:
– Yuba Mundo, a longtail cargo bike that is rock solid for carrying kids, gear, groceries, whatever
– Two LiFEPO4 10Ah batteries capable of about 40-50A output
– Front Forsen 36V 1000W hub motor. It is a high speed (up to 40 mph on the stand), low(ish) torque motor
– Rear BMC V2 600W hub motor. It is also a high speed (up to 30 mph on the stand), medium torque motor
– Right twist throttle pointing away from the Shimano twist shifter
– Left thumb throttle
– Lots of fun

The Yuba’s gear range is not super wide, so by pedaling alone, the top speed is around 17 mph. However, this bike will easily accelerate to 27 mph with no pedaling, using the two motors. It sucks down some batteries, however – at 25 mph, it draws about 22 Amps, which equates to about 1000W continuous. With both motors, this bike will accelerate up hill, fast.

One more note before the pictures – everything here is only temporary, so there was no attempt made to make it aesthetically pleasing. On the bike configurations we ride every day, and the configurations for our customers, we work harder on the aesthetics.

Yuba Mundo with two motors

Front picture of yuba with Forsen motor

Kids riding on the Yuba Mundo

I’ll just close with the thought that the Yuba makes a great bike for an electric setup like this – because it can haul so much weight, mounting a bunch of batteries on there is of no concern. The longer wheelbase makes it very stable even with a big load. And, the baloon tires with steel frame take up shocks in the road pretty well.

Morgan

One thought

  1. Why so few spoke crosses on the front wheel? I would expect that a builder would want to have the spokes as long as possible while being as close to tangent to the hub as possible, so more crosses…

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