I am 65 years old and have been using 175 mm cranks since my first real bike in
1967. I have had a total knee replacement and lost enough range of motion in
the affected knee that it impacts on my ability to ride smoothly. The problem
is mostly at the 12 o'clock position of the affected crank arm. It is a struggle
to power over the top. I am thinking about switching to 170 mm cranks or even
165mm. Considering the skeletal shrinkage that also automatically comes with old
age, I am thinking that 165 may be optimal. Has anyone else had a problem
similar to this? Did you create any new problems for yourself while solving the
targeted problem?
Dick Howard
Roanoke, Virginia
USA