Carbon fiber cranks: made sense in ebikes?

E

Eddy Current

100 mW
Joined
May 1, 2019
Messages
37
Hi all

So given we dont need that efficency levels compared to regular bikes, they dont save that much weight even if its rotatory mass and all that, my biggest doubt if they can transfer more to torque sensor because they are stiffer but not physically conected to the ring like normal bikes

Ok if you want ever more simple, are carbon fiber cranks a real improve on Ebikes in any way?
 
Nope.

Pros:
  • They weigh less, so you use slightly less wattage on hills.(probably measured in .00000000's of a watt)
    Less rotating mass so you can accelerate ever so slightly faster. (probably measured in .0000000's of a second)
    They make your wallet lighter, so you use slightly less wattage on hills. (probably measured in .00000000000000000's of a watt)
    Bike bling makes you cool.

Cons:
  • Extra Stiffness makes every bump feel worse.
    You feel every vibration even more.
    A pedal strike will end your ride, or end you.
    Lighter wallets mean less beer money. (Or less nachos, if you don't drink)
    Unnecessary bike bling makes you look like a tool.

If you're using a ring for a pedelec, you're not sensing torque, but rather RPM. if you have a torque sensing bb, then it still won't help. the total torque delivered won't change.
 
Your bike will weigh less by the amount that the cranks save. That's it. Makes no sense unless every other part of the bike is optimized first, especially for an ebike.
 
They will improve how cool you are. But if you don't care about cool, save your money, or put em on a pedaler where weight does matter.
 
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