Why would the steering wheel of your Toyota Corolla vibrate at speeds between 60 mph and 70 mph?

Answer 1

If you don't rotate your tires, your belts within the tires can separate and cause a vibrating feeling in your cabin in mid to high speed driving.

AnswerIf it's a 2009 Toyota Corolla it might be an issue with the new powersteering. EPS

There are essentially 3 aspects about the tires one should watch for. 1. Alignment (toe-in, camber caster), causes wear patterns, affects handling 2. Balance (tire center of mass is off the axis), causes vibration 3. "Out of round" - that's what the regular rotation is taking care of (recommended every 5000 miles), causes vibration as well. #1 doesn't do much about vibration (to my knowledge). #2 and #3 are very similar in their effect. #2 is easily cured by balancing. #3 could be mitigated (not cured) by regular rotation (if you've never done that before), or cured by getting new tires (and don't forget to rotate those!)

AnswerMy steering wheel vibrates in that speed range when my tire pressure is too low. AnswerTire loading can also be a factor...last two sets of Continental tires developed load (roundness) related vibration because belts pulled parallel to tread and developed "flat" spots that would shake the side of the car the defective tire was locaated on.

Some other considerations**

Lets say your brakes, suspension upgrades and aligments are good. Check your steering linkages, suspension pivot and attachment points (knuckle joints, rubber bushings) make sure there isn't any play that could be from damage or wear to these components. If your steering linkage is loose from worn out bushing on the drop bar, gear box, or whatever, at hihgway speeds your spinning wheels could cause cavitation that these components cant handle and eventually fail. Get someone ( mechanis shop, suspension specialist) to look at it first. I would suggest purchasing a low priced plan for aligment services. The one i got is dependable. They should help you determine how much the cost wil be to upgrade (polyurethane bushings, new shocks) or if your components are just worn (bushings (which could be upgraded when replacing), joints). Or it could be the dreaded CV joints. Atleast they can tell you.