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Chain Links Calculator for Generic Final Drive with new chain
There are 2 approaches to determine what needs to happen to your chain when changing sprocket sizes:
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Using a semi-fixed position of the rear wheel hence a
fixed sprocket distance and calculate needed links.
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Using the current chain and number of links to calculate the
new position of the rear wheel after changing sprocket sizes.
For help on the 2nd approach follow this link: Calculate new wheel position based on existing chain/belt length
The 'Chain Links Calculator for Generic Final Drive with new chain' part is
for using the first approach, assuming a semi-fixed position of the
rear wheel. You do not want to move your rear wheel forwards or
backwards and want to know how many links are needed for specific sprocket sizes.
This approach calculates the number of links using a
given sprocket distance.
This calculator can even be used without loading a specific bike as
there are only 4 parameters needed and in this approach are all known.
So it can used with or without loading a specific bike first !
Hence the title "Links Calculator for Generic Final Drive"
The parameters to be entered are:
1) Front sprocket number of
teeth
2) Rear sprocket number of teeth
3) Chain pitch (depends on
chain type)
4) the desired sprocket distance
After entering that data it will look like
this example:
The first 4 left fields are obviously for
entering the 4 parameters which will result in a calculated number of links in
column 'Number of Links Calculated'. As you can only buy whole links, the
calculated number will not work. So that calculated number is changed to the
nearest even number of links in column ' Number of Links Recommended'.
In above example the calculated number was 118.66 links which is is
changed to a recommended number of 118 links.
As this deviates from the calculated number links (118.66), also the
sprocket distance that will result from a
chain with 118 links will be different as specified by you. That is why
in column 'Actual Sprocket Distance' the new resulting sprocket distance
is shown which will be 27.04 inch instead of the initial 27.25.
This
means when using a 118 links chain, you will have move your rear wheel
27.04 - 27.25 = -0.21 inch forward.
This is as compared to the
initial sprocket distance entered by you.
If it shows >-<, the rear
wheel needs to be moved forward, towards the front.
If it shows <->,
the rear wheel needs to be moved backward, away from the front.
The 'Loaded Bike: Effect of Final Drive changes on links & wheel position' part on the
main page uses the second approach: "Using the current chain on a bike to
calculate the new position of the rear wheel after changing sprocket size".
This approach calculates a new sprocket distance using a given
chain length.
For
that calculator a bike from the database needs to be loaded and it is initialy assumed
that the current chain will stay on the bike if possible. It also calculates the
new sprocket distance but uses a fixed number of specified links. More info on
how to use that on the next Help-page.
Next:
Use the current chain/belt lenght to calculate the new position of the rear wheel after chaging sprocket sizes
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