The stock 150's are a good size to start with. They're long enough that
you have enough control to be able to learn to ride the Coker and do it
with some control. It would not be advisable to immediately go to short
cranks (125's or even shorter) before getting very comfortable with the
150's.
What is the terrain where you live? That's the big factor in
determining what size cranks you're likely to gravitate towards.
I'm not a member of the short Coker crank crowd. The shortest cranks
I've tried on the Coker are 140's. That's short enough for me. I don't
like the effort required to climb with shorter cranks. I live in the
Seattle area so I have to deal with hills. There are some hills on my
regular riding routes that I barely make it up with the 140's. I'm not
going to go shorter if it means I'm not going to make it up some hills.
I've also gone with 170's over the Winter here. The 170's are overkill
for the hills I've got, but they are very good for teaching you how to
spin more smoothly. The 170's are nice for rides that involve big long
climbs (for example 6 miles of climbing at 8%+ grade).
--
john_childs - Guinness Mojo
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