Originally Posted by
Markjc
I really like your description of "Think of chainring circumference in links, not chainring diameter."
I got around to looking at the bike and chain and I now think there isn't space to add a bigger chainring. The bike is an Cervelo Aspero and the chain stay bows out leaving very little of any space. (I can't post a picture due to not having made 10+ post)
Oh well.. But I did learn a lot from everyone's advice and comments.
Chain has 1/2" pitch so 4 teeth would add 2" to the circumference of the ring.
Divide by PI and you have the diameter increase. Divide that by 2 and you have the radius increase.
Assuming you have an 11T smallest cog, can you actually spin a 40T ring?