Late again!
My newly acquired streetmachine has 170mm cranks. 52,42,30, and a 9 speed block,11-34. I find big/ big and very useful gear, and do seem to spend a lot of time on the larger ring. I'm trying to spin, but 80-90 is about max for me, unless in short bursts. Not tried a BIG hill yet or the granny. Only 400km in so far. Was reading about shorter cranks and thinking about 160mm, but I'm 6'2" and have long ( big) legs, so spinning fast is not a natural for me. But reading this thread , Phil w is using 175mm, so I think I'll stick with the 170's for a while. Might swap the 42 for a 38 tho ( looks in cupboards). And the try some climbing in the granny.
Slightly OT, if one is in granny , on a HILL, and forced to stop, what is best way to get going again, as I've not tried it yet.