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To get a few extra mm reach on your front deraillur, use a longer bolt on the bracket and pack something between it and right side frame e.g. cut about 90 degrees of thick plastic pipe and put between deraillur and frame. I think the 34t steel is the smallest front chainring that easily works...

When you rearrange the gear cluster, the unused gears can to be put back as spacers as required. i.e. in my case only 5 out of the seven gears are used, the other gears are mere spacers. The stop screws are adjusted accordingly. Common practise with mid-drives to fix chainline and many think...

I done a DIY cheap job using available spare parts. The only thing I bought was the steel 34t chainring for about 10 euro. I had a spare 44t from an old 27 inch sports/racer. I used a spare front derailleur from a steel mtb which has a longer reach due to the smaller seat tube. I reshaped the...

42:28 = 3:2 (when divided by 14) = 1: 2/3 or one in two thirds. (when divided by 3). On a bike, the ratio of the front chain ring to the rear sprocket multiplies (increases) the speed but divides (reduces) the torque proportionally for a set cadence.

You could do better. At the moment, your lowest gear ratio is 42:28 which means only two thirds of the motor torque gets to the back wheel. I have mine (36v version) set up with dual 44/34 front and 14-34 rear which give me at lowest gear (34:34) full motor torque to the rear wheel. I think this...

I found the document below useful as it gives a good description of a basic controller in terms of its inverter/commutation/pulse width modulation function. Grin technologies also have a 'learn' page. https://ebikes.ca/learn.html

I read a post on another forum (German I think) of a user who built a stealth throttle. If I can remember, he dismantled the throttle and stitched the magnet into one of the fingers/thumb of the glove. He drilled a largish hole in the handlebars under the handgrip and placed the 'hall' into it...

Are you sure you don't mean pedal sensor. That the thing located on the inside of the front chainwheel. It consists of a magnetic disk and a sensor with a small red led light in my case. The light normally come on at startup but flashes when you pedal. It actually went faulty in my case due to...

Interesting.....I think anything that makes a bike more 'user friendly' is good and might attract people back to cycling that would otherwise be put off by things like dirty chains falling off etc. It might especially work well in this case as the users may only make short journeys or have weak...

One thing that possibly can cause a battery to fail early when 'nearly new' is if the original owner forgets to recharge the battery after full use and the exhausted/flat battery is stored away for a long time before resale. The owner eventually might charge the battery immediately before...

Two question that if answered might give an additional clue. 1. Are there any additional lights flashing ? ( e.g. The Low, Med or High lights flashing give fault message/codes) 2.There is a 'walk assist' thumb button function on the 790 unit. Pushing this button normally activates the motor...

I use schottky diodes now but have directly connected batteries in parallel. In practise, the batteries seem to equalize if the are within one volt of one another and this is a rule of thumb and common practise with experienced users. e.g...

Just to be specific, my daughters 2017 pendleton was fitted with a dnp 'epoch' 8 speed 13-32 tooth freewheel (similar to 28 version as as shown below). I suggest oiling as shown underneath the toothed locking ring so the oil flows through the ball bearings and on to the pawls inside the...

Thats a common problem. The cure is to put the bike (powered off) on its side on the floor with the freewheel facing upwards and pour plenty of 3 in 1 oil into the freewheel bearing that under the inside of the 13 speed cog while spinning the wheel to soften and flush out the solidified grease...

My daughter has a 2017 version of the Pendleton Somerby that has a 36V 8.8ah Phylion/Joycube battery and uses a 5 pin charger sslc084v42. They are available e.g. https://www.ebay.co.uk/itm/174615410221

What gauge are the spokes? e.g. 14g is 2mm diameter, 13g is 2.3mm, 12g is 2.6mm

Carry a double ended tube as a spare. (and a small scissors/knife to cut off the old tube). Then no need to take off the wheel.

Above quote for Samsung 29E spec sheet. So taking above as an example for a 10s 36 volt battery, if a cell is out of balance and is .05 volt higher than rest of pack at 42v, it runs the risk of going above the the 4.25 volt threshold. At the other end, if the controller low voltage cutout is...

My Yose 250 front bought in 2019 has a long motor cable that runs continuously the whole way to the controller (Julet 9 pin connector) thats fitted in a triangular frame bag. It has no connector near the wheel. I have the cable facing downwards (drip loop) and this gives enough slack to fit a...

I cant tell you anything about the formulae. But below is a simplified flow chart of how this function can typically be implemented in software. The PWM duty cycle value is adjusted (incrementally) depending on whether the current (as in present) motor speed is either greater or less than the...