Cranks: $100 for a lousy 2.5mm
I never paid any attention to crank length until last week, when I bought a newly affordable Stages left Ultegra crank power meter for $350. I learned that my one-year-old Trek Domain has 175mm cranks, while my nine-year-old Roubaix, now my Zwift bike, has 172.5mm cranks. A few minor knee twinges in the past year, 4000 miles, on the 175mm cranks. I’m 71 inches tall with a longer-than-average inseam of 34.5 inches; by height I should have shorter cranks, by leg length longer ones.
So here is my question: should I just install my new 175mm crank-meter and relax with a couple of Dogfish Head triple IPAs, or should I exchange it for a 172.5mm (or even 170mm) crank-meter, buy a matching right-side Ultegra crank for around $100, and THEN have the beers?