Hi all,

If i adjust my derailleur and the shifting is PERFECT while the bike is on the stand, is it possible that under Load it could be worse?
I ask cause the shifting, under load, on my 11sp wahoo (New cadette and chain) is off, but on my 11 speed carbon Reynolds rim, its impeccable, while
On the stand. Cant go out and test cause too cold...
Have trouble reconciling the difference. Unless something wrong with wahoo...

Admittedly,
It was initially tuned for the wheel and not the wahoo

A spacer/shim might be needed on one or the other to ensure that they're aligned identically and no RD adjustment is necessary when moving between the two, but I wouldn't do that until you can get out and ride. Can you just make a small adjustment for the Wahoo, jot down the number of turns and reverse when you can finally get out?

I am not entirely sure what you are asking, or what you mean by a "stand" (trainer? repair?) but shifting can be different on a mechanics stand than on the road and require a slight adjustment. If you are talking about two different rear wheels or wheel equivalents (a trainer setup of some sort), then absolutely yes. Shifting usually needs to be adjusted when changing wheels (or from a machine to a wheel) unless the hubs are identical. A change in position of the cassette relative to the derailleur of only 0.5 mm is still very significant as far as derailleur tuning is concerned involving several turns of the barrel adjuster.

The Wahoo 11-Speed is a trainer connected in lieu of a rear wheel; it has a cassette of its own.

Ok understood. It's
Not because both are 11sp that it will be the same

Okay, thanks. So like I (we?) were saying, different wheels or wheel substitutes will require readjustment of the RD unless they are intentionally or fortuitously identical in hub dimensions/spacing. Fact of life.

Yup.

1. Can frame flex affect shifting when under load? Yes.
2. Check your hanger alignment and check the fasteners on the hanger. Don't make up some story about how you've never crashed it so it should be straight, etc....I assure you the hanger is out of alignment. Fix that and all will be well.

FFS - just re-read the post - Yes your cassette on the wahoo is in a different place than on your wheel. These hub alignements aren't datums written in stone. They are different. Adjust your shifting when on the Wahoo. Re adjust when riding your regular wheel. Don't like it? Shim the cassette that is farther in to be a little further out.

Coolio boys