Originally Posted by
jadocs
What you are feeling is the chain rotating around the small cog. That buzz I think you are referring to gets quieter as you shift up as you described.
chain legnth was my first suspect , however chain is already 106 link , chain stay is 40.5 cm , i tried Shimano method "placing chain on big ring/big sprocket + 1 to 3 links
also tried this equation below , in both methods chain length shouldn't be shorter
"chain stay legnth by inch *2 + cranks teeth count/4 + largest sprocket count/4" + 1 ===> gives number of full links
using b-tension to tighten chain a little didn't help also ..
Regarding E-tube , i already have 53-39 crank .. so possible nothing i can do there