But the center of the cassette (5th of 9) is supposed to match between the two chainwheels for center of chainline. So one right of middle, 6th out of 9 should be fairly straight. Straighter than 9th anyway. I run a 14-25, so 0% chance of me using a 50-11.warthog1 wrote:Nobody wrote:True, but even lowly, overweight, middle-aged me with a heavy steel bike and no real sprinting ability is still happy to run a 50 which is almost 90% (89.2) of a 56. That's because it's mainly flat where I ride. Somewhat like a TT race really...
Are you regularly finding yourself in the 50-11 though? It is about a straight chainline where you spend the bulk of your time. Unless you are tting at 50kmh a 53 is more than adequate to achieve that.
I'm a wimpy spinner, so probably spend most of my time in 3rd or 4th out of 9, which is probably a 21 or 19, so 63.8 or 70.5 inches. So if I got the maths right, then me running 4th, or 19 with a 50 is (approx) the same as a 21 (21.2) with a 56. Can't see a big difference really.
Admittedly though, out of 11 speed rear is 6th being the middle. So that means probably 7th or 8th on an 11 speed for a straight chainline is going to be a 15 or 14 tooth, so you'd have to move a lot faster than me, not that that is a difficult thing to do. But if you don't need a straight chainline then 56 is not a problem, just run it in 3rd instead for 70.5 inches.