Quote:
Originally Posted by Mark McM
This is a good question. According to the 2020 catalog, there are only 3 sizes of 12spd cassettes (11-29, 11-32, 11-34)*. The largest 6 sprockets are in 2 3-sprocket steel monoblocs. The weights for the Chorus version is given as 310g vs. 266g for the Record/Super Record version. The Spare Parts catalog gives the same part numbers for the 6 smallest sprockets for all models, but the Chorus model has different part numbers than the Record/Super Record for the 6 largest sprockets. Maybe the Record/Super Record version has more material machined away for the steel monoblocs?
*There were at least 7 different sizes of 10spd and 11spd cassettes. Despite having more sprockets, the 12spd cassettes have as large or larger size jumps between sprockets than most 11spd cassette.
|
Could the R and SR use a lighter steel in the largest 6 sprockets? That’s a pretty big difference in weight been Chorus and SR when they’re both steel. I can’t imagine they can machine off over 40g in metal in the sprockets.