Nofiltercycling

I have a nexus 3i and I’m currently using a 23 tooth and plan to switch to a 13 tooth.
The 3i ratios are 0.733 - 1 - 1.364
I have one question. What formula would one use to figure out what would be the “theoretical” tooth count With the 0.733 ratio and the 1.364 ratio?

13 teeth at 0.733 = ?
13 teeth at 1.000 = 13
13 teeth at 1.364 = ?

Nofiltercycling

My research shows this


These results make me reconsider going from 23 to 13 tooth because from these results the 23 tooth cog on my nexus 3i will give me a 2.2 low a 3.0 in “neutral” which is the minimum value that is highlighted green on the ratio calculator and 4.1 in the high gear which is from what I’ve heard from YouTube is around what a Olympic track bike ratio is.

But these results put my 34 by 23 tooth ratio at a 1.48 ratio so I’m not really confident in my findings per say.

HillRider

Assuming you are asking about a 13T rear cog, the values you want are:

A 13T rear cog at 0.733 ratio would be 13/0.733 = 17.7, say equivalent to an 18T rear cog
A 13T cog at 1.0 ratio is obviously a 13T cog
A 13T rear cog at 1.364 would be 13/1.364= 9.5 or between a 9T and 10T cog.

Are you sure you can adequately spin gears that high? What is your chainwheel size?

Nofiltercycling

no 23 tooth
the images I shared include the numbers 23 and 34 referring to the tooth count that I am currently using.

23 tooth cog
34 tooth chainring

thanks in advance

Nofiltercycling

no clue but I can return with feedback.

Andrew R Stewart 

Years ago, my cousin John Allen told me to pick a 3rd gear (for my SA AW bike back then) that I could spin easily on a flat with no wind aid. He also made side bars as to the combining IGHs with "high performance riding" in the same sentence was a no no. I have followed his advice on the various IGHed bikes I have/had and found it to be correct for me. But I live in a somewhat hilly area, I spin and don't care if I coast down a hill after spinning out. Andy

Nofiltercycling

for sure. Thanks.

Would you be able to help me figure out what. The “theoretical” tooth count with the different ratios of my igh with a 23 tooth cog. With the ratios I have shared in images.

thanks in advance

Nofiltercycling

I just rode it. It’s not bad. The high gear feels similar to a stock bc. Just slightly lower if a ratio I feel like. Tomorrow in the day I’ll see how fast I can go. In
rem getting somewhere over 25mph in the past with a 36t cog and 21t ring

HillRider

Now I have no clue what you are asking. In your OP you ask about switching from a 23T rear cog to a 13T rear cog and I gave you the equivalent cogs with your IGH. Now you are back to a 23T cog. What do you really want to know?

Nofiltercycling

I can’t apologize enough I feel terrible for my inability to make sense to those reading this once again to everyone I’m am so very very sorry for confusing everyone.

at first I asked about about the 13 tooth
in the origin post

then in my second post I could have done nothing to make it more clear how i felt about the 23 tooth. To help those with adequate comprehension skills. I even did as much as to provide images that completely exclude “13 tooth” entirely.

I even directly replied to your post with a direct and clear “no” answer
no to your assumption and clarified what i was talking about to you directly and clearly. Assuming English is your preferred language. Here it is.

Quote:
Originally Posted by HillRider
Assuming you are asking about a 13T rear cog, the values you want are:

A 13T rear cog at 0.733 ratio would be 13/0.733 = 17.7, say equivalent to an 18T rear cog
A 13T cog at 1.0 ratio is obviously a 13T cog
A 13T rear cog at 1.364 would be 13/1.364= 9.5 or between a 9T and 10T cog.

Are you sure you can adequately spin gears that high? What is your chainwheel size?


MY RELY TO YOU WAS

no 23 tooth
the images I shared include the numbers 23 and 34 referring to the tooth count that I am currently using.

23 tooth cog
34 tooth chainring

thanks in advance



*THEN YOU COME BACK TO REPLY ONLY TO ADMIT THAT I HAVE PLACED YOU IN COMPLETE DISARRAY


here is the proof

quoting you*

Now I have no clue what you are asking. In your OP you ask about switching from a 23T rear cog to a 13T rear cog and I gave you the equivalent cogs with your IGH. Now you are back to a 23T cog. What do you really want to know?


My bad I guess I must be doing this English thing wrong.

its much more likely that I’m dealing with a degenerate simple because I’m your first reply you give me all this information

A 13T rear cog at 0.733 ratio would be 13/0.733 = 17.7, say equivalent to an 18T rear cog
A 13T cog at 1.0 ratio is obviously a 13T cog
A 13T rear cog at 1.364 would be 13/1.364= 9.5 or between a 9T and 10T cog.

all that from you

when in English
min my original post it clearly asks
I’ll just quote myself

I have one question. What formula would one use to figure out what would be the “theoretical” tooth count With the 0.733 ratio and the 1.364 ratio?


so you never answered what I asked.

maybe your doing this reading thing way wrong

l last words here

“What’s the formula”

clear enough

HillRider

I did indeed answer the original question and it should have been clear what the "formula" is from the numerical example in my first post. Just substitute the rear cog size of interest for the 13T cog you first asked about.

Nofiltercycling

This is fun

bboy314

I think you have far too much confidence in your communication skills…

3alarmer 

Nofiltercycling

for sure thanks. Moving on


i said I would return with feedback on mph not watts or cadence not sorry

with a 23T cog and 34T chainring I got to
in first gear 16mph
in second gear 20mph
in third gear up to 23
at a full sprint
I would say I am below average bike fitness and I actually did it in sandals. While I held my phone in one hand observing my speed on app.
I feel like I should go down a tooth on the cog. On the other hand I see the stats of group rides which id like to go on. Their average mph is 13-15 so we’ll see about going down teeth after I go on a group ride and see how I actually like the gearing.

3alarmer 

...I am very impressed by your modesty. Kudos.

Nofiltercycling

it was a 34 tooth chainring *actually

my bad

Nofiltercycling

The gps app said I got to 23 mph
this says maybe I got to 148 rpm cadence
pretty cool too me. I liked math in school, still do




34x17 used in the calculator because in my third gears 1.364 ratio x my 23T cog = about a 17T cog

I did 26 miles with that 23 tooth cog not bad. I’ll try the 22T