Originally Posted by
ruirui
mudpie, when I check the websites, I see 1 with the capacity 43T and some show 35T. What does that mean?
That's chain wrap capacity.
Largest ring-smallest ring + largest cog-smallest cog.
Currently you have-
53-39 = 14
25-12 = 13
Total = 27
Rders are rated by max cog size AND chain wrap capacity.