Effects on Chain Geometry: Calculate sprocket distance based on total chain (or belt) length and sprocket combination
Based on this calculated chain (or belt) length and the entered values for the sprockets, the resulting distance between the sprockets can be calculated for all 3 setups. The absolute numbers in the sprocket distance are not very meaningful but are used to calculate the differences in sprocket distance between the setups. This information indicates how far you have to move your rear wheel forward or backwards to accommodate the setup.
In this same table at the bottom on the right you can see the
how much your rear wheel has moved from it originbal (Stock) position to get in
it's Current position and also in what direction and by how much it needs to
move to get in the Custom position:
In this example when you changed your sprockets from
Stock to Current (14-36) setup, you had to move your rear wheel 0.26" backwards.
The '<->' characters mean: move front and rear sprocket further apart, i.e. move
rear wheel backwards
This is only feasible if you still have enough room to move your rear wheel in the
right direction. If not, if the rear wheel is already at maximum front or rear
position, the only option left is to get a new longer or shorter chain (or belt).