Siw444

Just Joined
Apr 5, 2023
2
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Has anyone got any recommendations on what conversion kit I should buy for my 19inch Cube Acid hard tail mountain bike?
I’m looking for high speed, ease of installation and a battery that will sit on the frame nicely.

thanks
 

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AGS

Esteemed Pedelecer
Feb 12, 2023
608
190
Your frame is versatile enough to take either a hub or mid drive and there will be no problem with battery location.

Hub drives come on two flavours, front or rear, but as you have front suspension it’s not recommended to use a front hub motor.

So you need to decide if you want to go for a rear hub or mid drive and if you want to go for a mid drive you need to decide if you want cadence or torque sensing.

There are pros and cons with both mid and hub drives and cadence versus torque sensing so it boils down to your riding style and what type of terrain you mostly ride on. Also to further complicate matters, hub drives come as geared or direct drive and again, each has it’s own pros and cons.

If you need a lot of assistance for hill climbing then a mid drive is preferred over hub drive. But you will have to use your gears to protect the motor.

If you do a lot of flat commuting then a hub drive is easier to use because you don’t need to change gear as much.

I have listed some popular EU/UK legal kits below that you may wish to consider:

Mid drive cadence sensing:

Mid drive torque sensing:

Geared hub:

There are many other kits on the market to choose from, some are road legal and some are not. So it depends upon what you mean by “high speed”.

High speed ranges from anything above 15 mph to knocking on the door of 50 mph.

Rough numbers are:
250w legal = 15.5 mph
500w = 20 mph
750w = 28 mph
1000w = 32 mph
1500w = 35 mph

If you want to go completely bonkers then high power (5000 watt) mid drives are available for off road use that are capable of 50mph. But you will need a big and expensive battery to operate at this level, plus you will probably kill yourself and others.


Here is a recent scary video of a speed test on a cyc motor running at around 3750 watts.

 
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