Wishes said:
Above 1000 watts, never shift under load.
I read somewhere a bicycle drive train can handle around 2000 watts. Above that, your stressing it. I run my gng at about 3.5kw, and it eats through chains, bends chain rings and wears out your rear cassette pretty fast.
this is somewhat true. What most people forget: The chain pull induced by the motor is always the same, it does not depend on the gear. But the engaged cassette sprocket teeth do change with the gear, since the slower ones are larger and so
they can take more load.
Simple solution: Use cassette sprockets with more than 14T. Smaller ones are waste very quickly. I have ridden my BPM2 more often these days (pulls 3200W), chain an cassette do fine. I just locked the gears smaller than 14T and dont use them.
But: This does only work since I only use very low phase amps to keep chain force down, I use 60A phas and 45A battery which is
a very small ratio of 1.333 . Factory setting is around 2.5. That would destroy my chain within a few hundred kilometers, since the chain always gets overstressed when pulling FT at low rpm.
BTW:If you want more than 3kW, 6kW is also possible with a derailleur chain, but you should only use sprockets with 28T+ :lol: that makes using this chain somewhat useless. I'd go for single speed in a 4kW+ bike.
Great that you did find your way to the market lightningrods
i'm jealous Anyway, the tips I just posted should be general info for your customers
lightningrods said:
Above 3kW not only are gears for the motor not necessary for most situations, gears for the pedals are not necessary.
I don't really understand your sentence completely, but for singlespeed the are better chains than BMX, like #219 and #35 and #41
PRW said:
LightningRods said:
LightingRods,
would you still be able to pedal - even if it is "fake" pedalling?
If you really want to pedal with high power through the gears and fast, freewheel cranks drive are useless. You should go for a "dual freewheel jackshaft drive" or (in more common words): a crossbreak style drive. It's superior to freewheel cranks in every manner
http://endless-sphere.com/w/index.php/EBike_Motors_Middrive#Jackshaft_Dual_Freewheel_Config
This should be possible with the LightningRods kit as well if you have the right parts and depending on your frame. Sadly LightningRods did never try it.