Originally Posted by
Positron400
Hi,
I am a bit confused by the different offerings of Microshift's Bar End shifters. While it makes sense, if you want indexed shifting, to go for the apropriate Shimano/SRAM 10 or 11 speed offering, it should be irrelevant if one plans to use them in friction mode, right?
Since there is a marginal difference (1.8 mm) in cassette width from 10 to 11 speed, shouldnt an 10 Speed Bar end shifter provide enough cable pull to use either in friction mode?
BR
Not necessarily. Shimano changed their road derailleur pull ratio (actuation) when they released 11 speed and 10-speed mountain. Formerly (e.g., 10-speed road and earlier, early Dura Ace excepted), 1mm of cable pulled by the shifter caused 1.7mm of derailleur movement for a Shimano derailleur. After the change, 1mm of cable pull caused less derailleur movement - about 1.4mm for Shimano 11-speed road, and about 1.2mm for Dynasys 10-speed.
This is explained fairly well here:
Science Behind the Magic | Drivetrain Compatibility ? Art's SLO Cyclery
Because of the difference in pull ratio, an 11-speed Shimano road derailleur (or a 10-speed Dynasys mountain derailleur) may require the shifter to pull more cable to make all shifts than many 10-speed shifters can pull, even in friction mode. I'm pretty sure that's why Dia Compe makes an oversized shifter (see the VO website) that's suggested for use with 11-speed Shimano road and 10-speed Shimano Dynasys derailleurs..