Bottom bracket sizing -- torque sensor install

noctrin

1 mW
Joined
May 10, 2022
Messages
15
Hey,

I'm good at electrical and software, terrible at mechanical. I would like to update my pedal sensor to a torque kind but i cannot for the life of me figure what would fit. I tried to google, i tried to watch youtube videos, but they seem to gloss over the actual tube diameter and thread type.

I'd like to buy something from grin since they're local, but i have no idea what fits. I read the threads and size have different standards.

Basically, i used a caliper and have the following measurements:

inner diameter of tube BB goes in: ~34mm (hard to get caliper around pedal)
length: ~98 mm

Some pics:
WhatsApp Image 2022-06-16 at 4.15.35 PM (1).jpeg
WhatsApp Image 2022-06-16 at 4.15.35 PM.jpeg

My questions:

https://ebikes.ca/shop/electric-bicycle-parts/torque-sensors/ncte-136.html

What's 136mm -- i assume the spindle is the shaft in the middle that i attach the pedals to? So what's the middle length that goes into the tube, what's the diameter?

https://ebikes.ca/shop/electric-bicycle-parts/torque-sensors/sempu-175.html

Looks like this is the one i'd need (i have a fatbike) since i assume that 100mm is the tube that goes in and it's pretty much dead on to what i measured. Can i assume the diameter and thread are correct?

Sorry for the dumb questions..
 
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