This is not 100% 3rd gen related but the basic information to figure out gear ratios has to be the same for everything?

I have a set of gear connected by chain. On the 2nd gear set the middle one must stay empty or the chains will rub.

Currently it set up for a 52/48 36/16 final

well that is tool high.

how do I figure out the final ratio from the frist set to the last gear?

I wonder about switching to a
29/36 48/16
or a
52/36 48/16

I know in the past with only one option 50/16 had a good feel but have no idea how to come close to that.

I suck at math BTW.

 

you can flip double gears over or swap gears end to end, or get another gear

 

I just wondered if its some simple math.

52/48= 1.08 to 36/16=2.25 = 1:2.25 final

29/36= 0.80 to 48/16= 3 = 0.8:3 final
[I like this one if the math is right?]

52/36= 1.4 to 48/16= 3 =1.4:3 final


I want to keep it tech related to figuring out gear ratio's but the gears can't be moved or switched easy.

A gear ratio is a gear set should be figure out the same in anything?

 

yes i'm sure it's soem simple math to figure it out and at one time i had done it but being the dumbass that i am i'v tried and can't get it to work out for me now

 

ok i played with the numbers again and i ended up same place you did. not sure if that makes us both right or both wrong. if it's something you can see you could turn it by hand and see how that works out.

 

Well you know people around here, they would be eager to point out that the math was wrong. So since I'm not getting flamed I [we] must be right?

I'll let the cat out of the bag some.

junk yard american chopper

 

i think i'd be making some changes to the frame. that extra unused post sure looks like a good way to hurt some parts i'd rather not have hurt.

 

scroll down. lots of pics as it evolved slowly. It at maybe 98% complete. That 2nd post is long gone. I may complicate thing even more if I can get a 3 speed internal hub for the rear tire.
Really make the gear ratio math hard.

not even sure how you would do the math for an inter gear set.
It would still have a 16t sprocket but inside it would have 3 gear planetary sets that would change?