Archives for Increasing speed

A Beautiful Restoration

Recently while visiting a very close friend, I found him working up a sweat 3cleaning his garage. This guy had stuff piled up on stuff so I offered to help for a while. While digging through the mess, I noticed what looked like a vintage bike in the corner of the garage. The bike looked pretty cool and I love to restore old things, so I asked what his plans were for it. Since he was going to trash it along with most everything else, I asked if I could have it and he agreed.

After putting in a couple of sweaty hours of help, I tossed the bike in the mini-van and headed home. Looking over this tattered little jewel, I found the 7frame seemed okay but I would definitely need to find some wheels. I decided to spring for a electric bikes conversion kit to bring it back to life properly. I found a website where I could order the needed wheels. I also fit the rear wheel with a Shimano Nexus internal gear hub. Before installing the new wheels, I stripped the bike and sandblasted the frame to make it suitable for a good paint job.

After spraying on several coats of paint, I rebuilt the carrier to fit the battery 4pack I had acquired. I had some old mudguards and a chain guard that I also painted a complementary color to the frame. I then began the task of  reassembling the bike and all its parts which took a little time as I didn’t want to scratch the new paint job.

All in all, the project took a little over four months as I had to wait to get the needed parts shipped to me. The rebuilt bike ended up costing more than if I would have bought a new one, but I was able to feed my passion for restoring old vintage bikes and I just love the bike I ended up with.



Increasing speed on Electric bicycle

A successful 45km/h e-bike project.

I was always curious how much speed and
power I can get out from my old Electric bicycle (Volto TDF 300W) and not to blow
something up.
One day a friend of mine, George, came around
with a story about how he added a 12V battery serial with the 36V lithium to
his foldable also Volto and it increase speed and power noticeably. The first
question was how far did he go on it and what about the controller? Did it handle
the 48V ok? He said he got from Ranui to Auckland city which is his route to
work and back. That’s 44km with not overheating, pretty good news! So it seems
the controller has enough reserves for extra load. It supposed to be 60V rated
and with heat protection and cost new $50.

How much power and speed we can get without doing expensive alterations.

Use only NZ or internet available parts.


The motor – Direct drive, less gear, less brush .It is simple and bullet
proof. Such a motor is very difficult to kill!


We discovered some fantastic hidden potential of the motor.

The coil- very easy to swap using a faster one from 20″ bike. It is inexpensive only $60



The trick No1

Use the 300W coil from 20″ bike and put it to 26″.
To swap it is quite easy job and increases the speed up to about 36km/h but losing a bit of torque. When I had done just this it was not really impressive because the bike had a lack of power it was equal to about 250W output so not really impressive if you have hills around.

The trick  No2

48V battery…. That was exactly what I need to do to get my power back.

After George tested the 12V lead acid battery in serial connection he found the capacity was not enough and the lead acid battery was getting hot and it blew up finally.  After some calculations we stated it could be used as an inexpensive occasional power booster (for short time only) otherwise the 12V battery capacity would have to be much bigger to handle the discharging current without heating up.

The battery solution

I bought 48V 9Ah lithium battery with a charger and a cable because there is a different plug for output connector because it is manufactured for different models of electric bikes.

 It is going fantastically 45km/h



New Zealand has specific regulations on using electric bicycles. The maximum legal motor power is 300W otherwise it has to be registered as a scooter. Also any information here could lead to bicycle damage, loss of warranty or personal injury/accident.

Enter discussion in forum.