[emilyblankenship]

I need a lot taller sidewalls for long dirt road ventures. The stock Passport tires have an outer diameter of 29.5". My EX-L has 245/50R20.
I'm thinking of the following options in order:
235/75R17 which are 30.9" and obviously 10mm narrower, or
235/70R17 which are 30", or
245/70R17 which are 30.5", or
245/75R17 which are 31.5"
I like the idea of little narrower and taller for the type of driving I'll be doing.
Pontificators and experts alike I value your opions please...
Also considering 16" wheels but on the fence on that option for now.

 

[emilyblankenship]

Honda Sense wouldn't know about a slightly larger wheel. It would think you are traveling slightly slower than you actually are. The ACC would still monitor the car ahead and increase/decrease relative speed accordingly. At least this is my speculation.

With respect to taller tires rubbing on full turn stop, that is a concern and I don't plan on lifting. I'll take some clearance measurements before making a decision. The narrower 235 tires should help and as Sib pointed out the wheel offset comes into play as well. I'd prefer to keep the wheels as close as possible to the body because the Passport is already a very wide beast!