I was clicking around other people's links and came across this:
Originally Posted by
osteoclast
Have a look at Sheldon Brown's multi-range gearing: 51/28 with 12-24 FW. Anyone do this?
More here and here
Gear Theory for Bicyclists
My O.T.B. - Only The Best
This is a really big shift! 23 teeth. Obviously it's possible to install such a shift but how well could the upshift work?
The biggest shift on most common modern bikes is the 16 teeth between 50-34 on a compact. The MTB doubles have a bigger ratio shift at 36/22 but the number of teeth is smaller, 14.
SRAM has a new group out for E-bikes, it's the same range as an 11-speed MTB but has 8 speeds and bigger shifts. The shifts are uneven and I guessed the reason was to control the number of teeth between the gears. The upper shifts are all 8 teeth.
https://www.sram.com/sram/mountain/p...block-cassette
The Eagle 12-speed cassette also has a final shift of 8 teeth from 42 to 50.
What's the biggest shift you've seen? In ratio or teeth, at either end. Teeth are more impressive, I think.