Recent content by JohnD135

What I have started to do is to change the 7 speed cassette from 28-14T to 28-11T and the main cog from 52 to 42. If I have my sums right, this should give me the same ratio for road use (which I currently like) and improve my hill climbing by 1.25. Not quite right but close. Concerning...

Starting to change the gearing, etc, as suggested and discovered the motor details under the cassette. It is as follows "Permanent magnet brushless high speed hub motor used for electric bicycles ZL 2003 2 0123400.9" Does that suggest that I can increase the current by 30% or so, at my own...

Nealh, what is a freewheel please?

As to the mountain bike conversion, I can see the logic of a properly balanced bike for use on very challenging terrain with excellent hill climbing ability. I go off road now, but only byways and Forestry Commission tracks. Not really very challenging. I think I will refurbish (it needs front...

Wow! Thanks for all the advise guys. You have given me two avenues to investigate. Refurbish the Oxygen or convert the mountain bike. I have understood the, quite complicated, issues with gearing changes and can probably get more torque hill climbing ability by changing both the cassette and...

I suppose I am disappointed. I thought I would get significantly improved hill climbing performance with a mid drive. But thanks for all the advice everyone. I will try to increase the range of my existing cassette and also reduce the resistance of the current sensing loop in the controller...

The wheel size of the old and new bikes are the same. 42T to 28T is what I have giving, as you say, around 50nm from an 80nm motor. I am retired now, but from what I remember, most motors are limited at low revs by the dissipation in the windings. My battery has 7 cells in parallel (10 in...

I have an old Oxygen Ebike with a rear hub motor. The bike is nearly worn out. I bought it second hand before lock-down and have had lots of fun out of it. But so many things needing replacing that I have decided to convert a new mountain bike to electric. I will be using it off road so...

Thanks Nealh, it is a relief to know that this is possible, although, as you say, alignment may be an issue. As to the Oxygen bike that I have Saneagle, it is very old and I was thinking it might not stand the strain! As to the hills, I climb a few of them now but am now not so fit as I was so...

I am considering converting an MTB to electric. I already have an old Oxygen with a rear motor, but this is not so good on very steep hills. Otherwise it is brilliant! Is it possible to have two main cogs on a mid mounted motor please? So that I can manage very steep off-road?

Yes, ordered 70 Molicel INR-18650-P26A from Nkon. Arrived in about a week and all charged to the same voltage, within 10 or 20mV. I checked one of them for capacity and 4.2V to 3.0V was 2.4AH. Close to the typical figure of 2.6 so I am happy. I am now learning about welding!!

Nkon included vat in the price I notice. But do customs charge much more, us not being in the EU?

I have installed the new LED810 and all the three power levels now function. I would say that the difference between power levels is probably less than it was, but still acceptable. Thanks for your help.

Hi All. I have just changed a broken controller for a new S-KU65 controller and it works well, with as much power as the previous one. I did this with a lot of help from this group for which I am grateful. But I have a small issue with power control. I have three power levels on the LED790...

Thank you so much. It is all working again now. Would it be useful for me to list all the connections that I made, perhaps in a spread sheet?