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I was getting a bad front-end vibration between 40-43 mph, regardless of whether the road was smooth or bumpy. Below that and above it -- no problem.

A quick stop at my nearby NTB confirmed my suspicion that one front wheel was out of balance. It also turned out to have a leaky valve stem. Both fixes were under warranty, so half an hour or so later I was on the road and driving happy. Got the Lafer on the freeway and up to 65 mph with no vibration at all.

What a great feeling!