Tiagra rear derailer with Ultegra Cassette

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I am wondering if anyone has any information about the compatabilty of putting an Ultegra 11-21 cassette on a rear wheel with a Tiagra rear derailer?

No dramas or problem?

Thanks

Originally posted by James Dalton
I am wondering if anyone has any information about the compatabilty of putting an Ultegra 11-21 cassette on a rear wheel with a Tiagra rear derailer?

No dramas or problem?

Thanks

Have recently done exactly that.

No problems at all (I should say no difference at all - the shift is still crappy)