Joined: Dec 2004
Posts: 12,548
Likes: 797
From: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Catrike Speed
Oh, it's probably critically important. Of all my bikes, homebuilts, low end or high end, I've changed the cranks at least twice on every one of them, and painted painted several frames; but I've never faced a BB shell. They all seem to work OK in spite of it.