Blog Archives

Electric Yuba – gearing

I have had a good couple of days with the Yuba. After 60 or so kilometres riding it two things were obvious. Firstly, the gearing needed work. Secondly – the “power profile” needed adjusting, i.e. the amount of assistance given

Posted in Electric Bikes, Yuba Mundo eV4

Electric Yuba – just how far will it go?

Well, yesterday I found out. After 23km on Sunday, including about 200 metres of climb, I thought I would leave it without charging, and do a few short trips to see how far the battery went. So on Monday the

Posted in Electric Bikes, Yuba Mundo eV4

Electric Bikes – Yuba Mundo eV4 – first rides

So, the build was finished at 6.00 on Friday, and Saturday morning I took it for a first ride, into Porirua to take my wife a coffee at work, and to buy some mudguards. Obviously this was to be a

Posted in Electric Bikes, Yuba Mundo eV4

Electric Bikes – Yuba Mundo eV4 – delivery and build

  OK, it all happened today! I rang Bicycle Junction just before midday, and was told that my motor kit had just arrived, and I could pick up the bike! At just after 12, I drove into Wellington to the

Posted in Electric Bikes, Yuba Mundo eV4

Electric Bikes – a new addition to the stable.

After 3 years of building and maintaining our two Giant Elwoods with Bafang 8Fun rear hub motors, I have decided to purchase a new e-bike to act as a company vehicle for my computer repair business. My existing e-bike is

Posted in Electric Bikes, Yuba Mundo eV4

Electric Bikes – hub motor torque/spacer washers

I originally posted this for someone who called asking for advice, but I am leaving it here in case it helps anyone else. When you get a bafang hub  motor, it comes with two “torque” washers, which fit over the

Posted in Electric Bikes

Electric Bikes – Wheel Building part 2

In the previous post  I mentioned the delay in getting the spokes I needed, well they finally arrived last week. Lacing the wheel was reasonably easy, and stress free, other than the slightly disturbing way the wheel goes together, so

Posted in Electric Bikes

Electric Bikes – wheel building

It’s close to 3 years since I started the process of building our electric bikes, going through a decision process, followed by researching suppliers, followed by taking the big leap and ordering a lot of parts. The major part of

Posted in Electric Bikes

Arduino – multi-cell voltmeter

Right at the start of the saga which is my multi-cell voltmeter/potential BMS, I considered and rejected the simplest way of doing this, namely using voltage dividers to drop the voltage from the cells down to within the range of

Posted in Arduino, Computer Stuff, Electric Bikes, Programming

Electric Bikes – a quick battery check

When I got home on Friday, Lynn’s bike was on charge, whirring away (noisy charger!). As she only left an hour or so before me, this was OK. However, when I did the rounds at bedtime (4 hours later), checking

Posted in Electric Bikes