Originally Posted by
noglider
Front is 52, and rear is 19. 52 / 19 * 27 = 74. So for Americans, it's a 74" gear. The ratio is 2.74. I don't know what the rollout is.
Mine is 46 / 17 * 27 = 73, so a bit smaller (but a noticeably smaller chainring and slightly smaller cog. Math!). I wouldn't go any bigger because of some of the hills on my commute (which exceed 10% grade for a few short sections), and in fact, I have a 44T chainring waiting in my parts bin. Not there yet. Not quite.