Accidental ebike newbie with controller and battery questions

[hdw123]

Hello hello. I got my first cargo, disc and ebike all in one package the other day. I was aware of the first two specs but not anticiapting having a MXUS 250w 36v front hub motor involved. According to the previous owner, hub works but he gave up trying to sort out a new battery/controller.

So my plan is to get a new battery and controller to get the motor going again. My limited understanding and research has led me to believe I need

- a controller rated at 250w 36v
- a battery rated at 250w 36v

Is this right? For the battery amps, should I go for a 10ah or more? The bike doesn't have peddle assist, just throttle and brake sensors, does this limit my controller choices as I'd like to reduce the amount of rewiring I'd have to do?

I'm only planning on taking my arthritic dog to some local parks with so don't need anything too extreme, for now.

Appreciate any advice and help

The ride

 

[alan0048]

This great Grin tutorial was a wonderful help for me in determining the correct spoke length:

How to Measure Hubs and Rims for Perfect Spoke Lengths, Ebike Hub Motor Wheelbuilding

They also have a good tutorial on (hubmotor) wheelbuilding and also a good spoke calculator.

These are the spokes to use:

Sapim Strong Single Butted J-Bend Spoke

A butted spoke is drawn to its specific profile, which defines its high strength. The strongest spoke in Sapim’s product range, the Strong is developed for specific and heavy usage such as tandem, e-bikes or heavy load use. In case of large hub holes, the Strong is the recommended choice...

wheelbuildingparts.com

And if you need washers for overly large hub flange spoke holes:

Sapim Spoke Head Washer

Spoke washers help adjusting bending better to the hub. This washer adds additional reinforcement at the neck of the spoke.

wheelbuildingparts.com

Thanks for the information! I ended up using spoke calculator luckily MXUS XF07 was listed among motors.
Ordered 2.33 x 256mm stainless steel spokes (with nipples) going for a 2-cross pattern as those were cheapest and available nearby me.

 

[alan0048]

Worked great with 256mm spokes, 2-cross pattern. MXUS XF07 confirmed working in sensorless mode. Had to make my own 9->6pin adapter cable but worked in the end.