[lisa91]

I think most people who switch are doing so more for offroad capability reasons. If you dont plan to, the lower aspect tires are fine for city driving. Lower aspect tires do have some disadvantages as the stiffer side walls make them louder over small bumps and make be a tad rougher. Lower aspect tires also tend to cost more to replace.

For offroading you would want more sidewall on your tires. Dont want to scrape those aluminum wheels. With more side wall you can also air down your tires a little bit for better grip over rocky terrain. In addition off road tire selection is much better on say a 18" wheel than a 20" because that's what a lot of people use.

Also keep in mind increasing or decreasing your tire aspect ratio will usually affect your speedometer as well.

 

[lisa91]

How much louder will they be? I do want to keep road noise down.

I was thought you could reduce the wheel size in conjunction with increasing the sidewall of the tire and come to the same combined diameter and thus have the speedometer unaffected?

Yes you are correct, as long as it ends up being the same height you are good. I wasn't clear, I was just saying if you keep the stock wheels and decide to change the tire ratio.

As for noise difference I have no idea. Maybe test drive a Passport and then a ridgeline. I dont know lol.