HIGHLY unlikely clutch issue, would not vibrate to the steering wheel..

I would guess bad front tires, tire pressure, alingment, wheels not bolted down correctly or as Kevin says...and has happened to me before..a new tire with a BAD inner tread...take back to the tire shop, they can dismount and look on the inside if it is starting to seprate...but almost 99% sure something with the tires..

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