Originally Posted by
tomtomtom123
You are supposed to shift the rear derailleur at the same time that you shift the front derailleur, if you want to maintain the same cadence on the same surface.
Ah, but I use downtube friction shifting and really, it's only an issue on sustained climbs of over 5%. I'm in the big ring most of the time. As to the connection points on the 30T, the holes are almost in line with the tops of the teeth. They fasten with with 5M hex bolts, IIRC, and the 30T is tapped to receive the bolts. I was a little suspect to the strength of this type of connection, but so far no problems. I've put a couple hundred miles on them and not a peep. They are meant to work with any 5 arm crank with 110 BCD.
Thanks for all the technical info!
Jeez, if I'da know there was going to be math involved....
)