TheDoctor wrote: ↑Wed Jan 26, 2022 9:45 pm
Comparing your photo to the SRAM manual shows that you now have 2 links above the ideal extra lenth:
One tooth on the cassette is 1 link. So if you size it now on a 28t sprocket you would need 2 links extra to account for a 30 which I believe you are aiming for? Conversely, going from correctly sized chain on a 33t sprocket to a 30t, you'd need to take out 2 (3 is not possible as you'll always change links with even numbers - inner plus outer). Which is what you did. In other words, I don't see why this would be too short?
My advice by the way would be to determine the link where the chain ends meet, and determine the extra links, on the outer ring. Keep the end of the chain that goes up over the ring at ~4 or 5 o'clock and make sure that the other end coming from the cassette rests in the outer ring teeth. When trying to pinpoint this length between the outer ring and the cassette you'll be off unless you can keep the chain in a perfectly straight line.
Park Tool's blog shows what I mean:
https://www.parktool.com/blog/repair-he ... gth-sizing
So I accidentally managed to do it right then, excellent.
For once I didn't screw something up, which I was trying to fix.
Alright, I understand what you mean after watching that video. Now I know for next time. I did it as shown in the Sram picture, but it was hard to get them straight, with no slack. I did only remove 1 inner and 1 outer as you point out, and the chain had have been sized right from the factory for 10-33, which the bike came with.
Does having a chain which is two links longer for the cassette have any impact on efficency at all? I am not sure when or even if I'll be using another set of wheels with a 10-30. And if I do, it will be used much less then the 10-28. But I just wanted to leave that option available.