One of the great things to upgrade an old bike
is the drivetrain
Some people might want 10-speed
and some might want singlespeed
It all depends on your preferences
Today I'm going to replace the bottom bracket
to Hollowtech II
in order to mount this crankset
Before taking out the old bottom bracket,
both crank arms have to be removed
There are different cup diameters
The most common sizes are 42 and 44 mm
The first impression after the install
is the smoothness of the cranks
It used to have some resistance to the crankset
but now I couldn’t feel it
The spinning is much improved
and I’m very impressed with that