ooo wrote: ↑Fri Jul 01, 2022 10:51 am
yes, I think combination of ultegra deraileurs + 105 cassette = my guess it is hg+ 2.0 capable
This is the exact opposite of correct.
1) cassette geometry of 105/ultegra looks the same, all ramps and holes are the same
You can't say this unless you've been looking at the
back side of the sprockets, because that's where HG+ machining is.
2) IF this combo "ultegra deraileurs + 105 cassette" was not capable of hg+ 2.0, then CS-R7100 should not be listed as compatible with ultegra/dura-ace FD/RD, but it is listed as compatible
No. There is absolutely no reason why a given rear mech will not work just fine with either an HG or HG+ cassette, no matter which one it is 'supposed' to pair with.