Switching from index to friction shifting allows you to change gears without limits
Today I'm going to upgrade the drivetrain of this road bike
From 6 speed to 10 speed, without changing the derailleur
Index shifting has click stops, each shift moves the derailleur with the same amount of spacing
Friction shifting doesn't have any click stops or indexing
The shifter moves linearly and is compatible with any amount of gears
The shifting can be accurate when you get used to it
The 6 speed and 7 speed have different sprocket spacing
Therefore you cannot use the index shifter with the 7 speed cassette
By putting a 7 speed cassette, you need to set the limit screw
to allow the derailleur to shift to the lowest gear
For the 10 speed cassette, the limit screws have to be adjusted
But most importantly, the chain is too wide and you need to change it with a 10 speed chain
The shifting can be precisely with a little more practice