Wow! Just ….. wow! I’ve had this exact issue on my Giant Yukon for the past 2 years and tried everything to fix it. This video was the answer. Thank you so much!

my cassette is jumping and more or less now in free wheel, cannot wait to take it apart after watching this bit of wisdom

Thanks for this video! I had the same issue and finally got around to taking a look and I suspected the problem. This post confirmed. Changed it out and problem gone.

Really appreciate this video. Exactitude! How important and hard to spot. (I'm a noob with wrenching; just trying to learn and grow in all this.)

Good one!!

A perfect example of "Assume NUTHIN'"! 😜 👍

My guess (paused video at 1m20s) the cassette is too close to the chainstay, the Ultegra derailleur cannot move to that extreme... OK time to watch the rest of the video!

Can the problem happen between 8th & 9th gear? Thanks in advance.

it was seen from the space

never swap lockrings, same speed or not with the same brand or different brands for same speed. may damage (crack) the freehub because thread between lockring and innerhub are not exact the same and you try to overthight when there is no more thread to play. Use the lockring supplied with the cassete when you bought it and no other.