Big Bottom

[Bigbee]

Ive just seen an e-bike on a website that features " big bottom bracket shell "

What does this mean please?

thanks

 

[carpetbagger]

i think its the bit where the pedals attach to but somebody will correct me if i am wrong

 

[Footie]

Definition from Wiggle site

Bottom Brackets:
Bicycle bottom brackets connect the cranks to the bike and allow the crank arms to rotate. There are various sizes of bottom bracket shell on the market, so compatibility needs to be checked. The three most common frame bottom bracket shell widths are 68mm (English threaded road and mtb), 70mm (Italian threaded road) and 73mm (British threaded mtb). There are also many axle shapes and styles, from JIS or ISO square tapers through to the round splined axles such as ISIS or Octalink and then there is the new external cup systems which have the axle built into the crank arms. Some frames are now using the new BB30 system which uses bearings pushed directly into the frame and removes the needs for cups to be threaded into the frame.

Cycle | Cycling | Bottom Brackets At Wiggle
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[flecc]

This is a bike bottom bracket where the pedal cranks attach

I searched for the words you mention and found this description on the source Chinese site:

big bottom bracket shell,
collocating EAD moment-drive control system

I think what they are trying to say is that the pedelec and torque sensor which detects if the pedals are being turned and the amount of pressure applied is located within the bottom bracket, possibly making it wider than usual.

As for EAD, the eZee bikes can have a control called EAF which stands for Easy Assist Factor, so EAD may stand for Easy Assist Device, i.e. the power regulated by that torque sensor.
.

 

[Footie]

This is a bike bottom bracket where the pedal cranks attach

I searched for the words you mention and found this description on the source Chinese site:

big bottom bracket shell,
collocating EAD moment-drive control system

I think what they are trying to say is that the pedelec and torque sensor which detects if the pedals are being turned and the amount of pressure applied is located within the bottom bracket, possibly making it wider than usual.

As for EAD, the eZee bikes can have a control called EAF which stands for Easy Assist Factor, so EAD may stand for Easy Assist Device, i.e. the power regulated by that torque sensor.
.

My feeble efforts pail in insignificants in the shadow of the Pedelec Guru
Lesson learnt
.

 

[flecc]

My feeble efforts pail in insignificants in the shadow of the Pedelec Guru
Lesson learnt
.

Not so Footie. My post was only about the specific, but your's was a whole lot more useful to someone wanting to know about bottom brackets.

I'm always conscious of the fact that we often have more visitors than members viewing, many anxious to learn the subject, so all information given is useful, often to people we are totally unaware of.

You keep right on posting your valuable contributions, you never know who's there reading and welcoming them.
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[wotwozere]

Hi

Ah ah ah that is the funnyiest thing I have ever tried to read


thx

Bob