You might try a local tire dealer for a "balance & rotate" (or the dealer for that matter) A balance & rotate would be a good place to start - you'ld get correct tire pressures & all tires balanced. They'ld also be able to spot a possibly bent wheel or catch a tire that might be out of balance. Note: Take it to a quality shop, because the "eco-cheap" places do eco-cheap work and will try to vacuum those LLLLLs from your wallet.