Join Date: Jul 2010
Location: Na Klang, Thailand
Bikes: Alloy Mountain Bike
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Yes, that top gear certainly seems very close to the frame.
If I read what you say correctly, there is a total loss of drive, not just the chain jumping?
If this is the case it would be worthwhile to remove the cassette from the freehub body and check the splines on the freehub body. It sounds like they may be stripped right at the end where the high gear sits.
From the photo it looks like a Shimano setup, so you will a Shimano cassette tool and a chainwhip to remove the cassette,