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the word 'scale' as in 'they scale the motor support' is a good choice of word. however, 4 (or more often 5) basic power levels are perfectly good for what we need because within each power level, you can control theoretically between 0% to 100% by varying your input. There is no real need for...

it means that we just have to accept daily death toll and get on with life. I expect the daily toll to settle at around 500 in hospitals + 300 in care homes. I know someone who works at Southend General's ICU. They do better for their patients, more getting out now healed than dead. I wish we...

Torque is measured at the cranks for crank drive motors, and at the wheels for hub motors. When a crank drive motor turns the rear wheel, what is conserved is the power of the motor. The relationship between power and torque is: power (in Watts like 250W) = torque (in Newton Meter NM) *...

How tall are you? I you want a step through bike: if you are under 5ft10, the Woosh Santana3 is my recommendation. https://wooshbikes.co.uk/?santana3 or Santana CD: https://wooshbikes.co.uk/?santana-cd Over 5ft10, the Crusa is a good alternative. https://wooshbikes.co.uk/?crusa If you...

the output of a CD motor is proportional to the cadence. The problem is this: most riders can't keep their cadence at 100+ RPM to get the most out of the motor when climbing hills. If you like CD kits, have steep hills and are not very fit, choose the 48V TSDZ2T with throttle. It will give you...

they are pressed into the casing. The bearings are on ebay, amazon etc. the clutches are on aliexpress- a bit more expensive. Just google TSDZ2 blue gear. I get them from Tongsheng.

service interval: around 4,000 miles. Mainly new ballbearings and grease. you may have to replace the clutches (blue gear's and main gear's needle bearings) before that, depending on how fast you ride. They are about same.

60 firms, 80 candidate vaccines, all based on the new nano medicine technologies - most will kill SARS-COV-2 but many will also kill the patients, some right away, some in the near future. How to make $$$ billions:

it's the viral load density. You need to look at the diffusion across a membrane. https://en.wikipedia.org/wiki/Fick%27s_laws_of_diffusion The mask does not protect as well if too many people are in a closed space too long. Droplets will stay suspended for hours in still air and in closed...

after an unprecedentedly busy week, I've run out of a few models. Only a few Ramblettas left. Next arrival of Rambla: June Next arrival of Santana3: end of July Next arrival of Camino: end of July Next arrival of Rambletta: end of July Next arrival of Big Bear Plus: August Really sorry for...

you should install the speed sensor, if only to make sure it's all working correctly. Keep the magnet about 10mm from the sensor head. Then think about changing the speed limit in the LCD instead of disconnecting the speed sensor. You would then know for sure when you go over the legal speed limit.

only China got hit with anti-dumping duty on e-bikes. you can assemble your e-bikes anywhere else in the rest of the world without being penalised.

yes.

it seems that we are settling down to 4,500-5,500 new confirmed cases a day since beginning of April (1/4-23/4) - at 12% death rate, that's 600 a day in hospitals. Plus 40% for deaths outside hospitals, that's 1,000 deaths a day. Italy has 2,700 new cases a day, nearly 50% less than we do. They...

Their problem is the ratio of number of confirmed cases versus number of tests. They want to maximise the confirmed cases and spend less on testing kits.

you have two freewheels, the normal freewheel on your right works like a single speed freewheel, the one on your left is driven by the motor. When the motor is on, the wheel moves but chain does not have to move.

I suppose they want to save up some test kits. That's the natural consequence of hiring bean counters to manage an outbreak.

that booking site opens at 8AM to 8PM. I don't know why those hours but by 9AM, all the home testing kits have already been all booked out. 'Come back tomorrow' it says.

If you are an essential worker and "have symptoms", you can request up to 5 home test kits for yourself and your family. It's a bit silly really while we have spare capacity. Why wait until an essential worker exhibits symptoms? that may be 10 days too late...

Voodoo Bizango is Halfords own brand. I like it though, albeit the battery is only 418WH, low for 2020. They don't build their bikes here though. I also like decathlon e-bikes. They are assembled in France, not some poor country in the Far East...