I recently purchased a used set of Cooper STT 285/75/16 tires, moving up from a set of Kumho 265/75/16 MT's. Problem is when I mounted the used tires, the steering wheel would vibrate really hard when getting between 60-65mph then steady out at around 70mph (but still a bit shaky, more than my Kumho's). I checked the tire pressure and noticed the back tires were a bit low so I aired them up and drove around again. It improved the vibration a good bit, but there was still something off with them.
I assumed that they may need to be balanced so I took them to the tire shop near my place this morning and had them re-balance all the wheels. Took them out for a spin again and still vibrating at the same speeds. Also the steering feels a bit buttery. It's definitely not as smooth as it was before. Would I need an alignment done when moving up from a 265 tire to a 285 tire? Could that be the cause? The tires don't seem to have uneven wear and they all seem to have the same tread depth. Any input would be appreciated. Thanks in advance!
I assumed that they may need to be balanced so I took them to the tire shop near my place this morning and had them re-balance all the wheels. Took them out for a spin again and still vibrating at the same speeds. Also the steering feels a bit buttery. It's definitely not as smooth as it was before. Would I need an alignment done when moving up from a 265 tire to a 285 tire? Could that be the cause? The tires don't seem to have uneven wear and they all seem to have the same tread depth. Any input would be appreciated. Thanks in advance!
