Robots are coming fast

[Jeremy McCreary]

@Jeremy McCreary ,.. I know that you're a gearing geek.

Can you give me a rough idea how my 36T chain ring connected to my 7-speed 11-34T freewheel will compare to the original 44T chain ring?

I've got 27.5" X 2.8" Schwalbe Super Moto-X tires.

I don't want to go over 20mph and risk $5,000 in fines, so will my gearing and BBS02B land me in jail, and my ebike confiscated?

Will I be able to go 2-3 hundred mph with 3000 Watts of Raw POWER available ??

A lot of us like this graphical gearing calculator:

Ritzelrechner - Graphical Gear Calculator for Bicycles

The bicycle gear calculator displays graphically the gearing of derailleur gears and gear hubs. It can be used to compare different setups to find the optimal gearing for all kinds of bicycles.

www.gear-calculator.com

I set it up to compare 44t and 36t chainrings on a 9-speed 11-34 cassette at an arbitrary cadence of 70 rpm.

The number of rear cogs is irrelevant here, as you're only interested in the ground speeds given by the smallest and largest (11t and 34t) cogs at your cadence(s) of interest. These speeds appear above the inverted triangles.

Put in the lowest and then the highest cadence you're comfortable with, take a screen shot of each case, and compare the screenshots.

NB: This says nothing about how fast you can go with a given motor and rider power input. For starters, you don't have the data needed to estimate that.

It only says how fast you'll be going in a given gear at a given cadence with a given wheel diameter when actively pedaling. Whether you could actually reach that cadence in that gear on your ebike is a separate issue.

 

[gromike]

Now back to the robots. This vid was posted today on endless sphere:
The World's First True Artificial Superintelligence | Asinoid by ASILAB .
I don't know whether to buy a shovel, gun, or stock.

 

[PCeBiker]

I set it up to compare 44t and 36t chainrings on a 9-speed 11-34 cassette at an arbitrary cadence of 70 rpm.
Put in the lowest and then the highest cadence you're comfortable with,
NB:
It only says how fast you'll be going in a given gear at a given cadence with a given wheel diameter when actively pedaling.

My cadence is and always will be 0

But this calculator can still work nicely.

I just need to find out the maximum and minimum rpm output of my motor into a 36T chain wheel.

I think I know that my BBS02B is most efficient at ~80% maximum rpm, but I don't know what that is or the gearbox ratios.

Maybe @Gionnirocket can help with providing an idea of the approximate cadence (rpm) my motor is comfortable with?

Give or take a few mpg, or mph, or inch pounds per foot, or whatever ??

 

[Jeremy McCreary]

My cadence is and always will be 0

But this calculator can still work nicely.

I just need to find out the maximum and minimum rpm output of my motor into a 36T chain wheel.

I think I know that my BBS02B is most efficient at ~80% maximum rpm, but I don't know what that is or the gearbox ratios.

Maybe @Gionnirocket can help with providing an idea of the approximate cadence (rpm) my motor is comfortable with?

Give or take a few mpg, or mph, or inch pounds per foot, or whatever ??

I really shouldn't have answered because gearing has no connection whatsoever to this thread.

 

[PCeBiker]

I don't know whether to buy a shovel, gun, or stock.

You need to buy a UART BBS02B before they're all gone and replaced by CAN-BUS Robots

I have no place for robots or wifi or Bluetooth or digital data crap on my ebike.

Straight from throttle to controller to motor.
No unnecessary artificial interruption.

 

[PCeBiker]

gearing has no connection whatsoever to this thread.

It does if the robots are controlling it and leaving the rider out of the loop.

I don't want to ask the AI Robot cloud for permission to activate my throttle.

I still have a small delay in my throttle response due to Artificial Interference.

 

[gromike]

You need to buy a UART BBS02B before they're all gone and replaced by CAN-BUS Robots

Have had one a Trek 7.2 for three plus years, though I thought this thread was about the coming robots.

 

[Rás Cnoic]

A lot of us like this graphical gearing calculator:

Ritzelrechner - Graphical Gear Calculator for Bicycles

The bicycle gear calculator displays graphically the gearing of derailleur gears and gear hubs. It can be used to compare different setups to find the optimal gearing for all kinds of bicycles.

www.gear-calculator.com

I set it up to compare 44t and 36t chainrings on a 9-speed 11-34 cassette at an arbitrary cadence of 70 rpm.

The number of rear cogs is irrelevant here, as you're only interested in the ground speeds given by the smallest and largest (11t and 34t) cogs at your cadence(s) of interest. These speeds appear above the inverted triangles.

View attachment 204338View attachment 204339
Put in the lowest and then the highest cadence you're comfortable with, take a screen shot of each case, and compare the screenshots.

NB: This says nothing about how fast you can go with a given motor and rider power input. For starters, you don't have the data needed to estimate that.

It only says how fast you'll be going in a given gear at a given cadence with a given wheel diameter when actively pedaling. Whether you could actually reach that cadence in that gear on your ebike is a separate issue.

My favourite is good old Sheldon Brown's (RIP) gear inch calculator. Legend of a bike wizard that he was.

Sheldon Brown's Bicycle Gear Calculator

A JavaScript calculator for analyzing bicycle gearing

www.sheldonbrown.com